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You searched for: Subject term crystal structure Remove constraint Subject term: crystal structure Subject term crystals Remove constraint Subject term: crystals Subject term differential scanning calorimetry Remove constraint Subject term: differential scanning calorimetry Text availability Citation in PubAg Remove constraint Text availability: Citation in PubAg
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1. Alkali resistance of poly(ethylene terephthalate) (PET) and poly(ethylene glycol-co-1,4-cyclohexanedimethanol terephthalate) (PETG) copolyesters: The role of composition

Author:
Tingting Chen; Weikai Zhang; Jun Zhang
Source:
Polymer Degradation and Stability 2015 v.120 pp. 232-243
ISSN:
0141-3910
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; alkali treatment; alkaline hydrolysis; anions; corrosion; crystal structure; crystallization; crystals; differential scanning calorimetry; ethylene glycol; microscopy; polyethylene terephthalates; reflectance; temperature
Abstract:
... The alkali resistance of poly(ethylene terephthalate) (PET) and a series of poly(ethylene glycol-co-1,4-cyclohexanedimethanol terephthalate) (PETG) copolyesters with different molar ratios of ethylene glycol (EG) to 1,4-cyclohexanedimethanol (CHDM) was systematically investigated. Differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) were used to probe the effect of the a ...
DOI:
10.1016/j.polymdegradstab.2015.07.008

2. Analysis of crystals of retrograded starch with sharp X-ray diffraction peaks made by recrystallization of amylose and amylopectin

Author:
Xijun Lian; Kaili Cheng; Danli Wang; Wei Zhu; Xueqing Wang
Source:
International journal of food properties 2017 v.20 no.sup3 pp. S3224
ISSN:
1094-2912
Subject:
X-ray diffraction; amylopectin; amylose; crystal structure; crystallization; crystals; differential scanning calorimetry; mixing; molecular weight; nuclear magnetic resonance spectroscopy; retrogradation; sweet potato starch; sweet potatoes
Abstract:
... Retrogradation is a common occurrence of starchy food and many methods have been tried to retard it. Uncovering the crystalline structure of retrograded starch provides us the necessary information to get an effective method. In this paper, the crystals of retrograded sweet potato starch with sharp X-ray diffraction peaks were obtained by blending sweet potato amylose and amylopectin with narrow d ...
DOI:
10.1080/10942912.2017.1362433

3. Assembly pattern of multicomponent supramolecular oleogel composed of ceramide and lecithin in sunflower oil: self-assembly or self-sorting?

Author:
Shenglan Guo; Mingyue Song; Xiangyang Gao; Lulu Dong; Tao Hou; Xiaokun Lin; Weijie Tan; Yong Cao; Michael Rogers; Yaqi Lan
Source:
Food & function 2020 v.11 no.9 pp. 7651-7660
ISSN:
2042-650X
Subject:
Fourier transform infrared spectroscopy; binding capacity; ceramides; crystal structure; crystals; deformation; differential scanning calorimetry; gelation; health effects assessments; hydrogen bonding; lecithins; light microscopy; microstructure; oleogels; paper; phosphates; sampling; sunflower oil; van der Waals forces
Abstract:
... Ceramide (CER) is a novel food-grade organogelator with beneficial health effects. Lecithin (LEC) is not an effective gelator; however, it may alter the crystal morphology of the host gelator in a multicomponent system. In this paper, LEC and CER were mixed at various molar ratios in sunflower oil leading to different gelation behaviors. It was interesting since in this multicomponent system, gels ...
DOI:
10.1039/d0fo00635a

4. Biobased copolyesters: synthesis, crystallization behavior, thermal and mechanical properties of poly(ethylene glycol sebacate-co-ethylene glycol 2,5-furan dicarboxylate)

Author:
Guoqiang Wang; Min Jiang; Qiang Zhang; Rui Wang; Guangyuan Zhou
Source:
RSC advances 2017 v.7 no.23 pp. 13798-13807
ISSN:
2046-2069
Subject:
composite polymers; condensation reactions; crystal structure; crystallization; crystals; differential scanning calorimetry; ethylene glycol; glass transition temperature; melting; molecular weight; nuclear magnetic resonance spectroscopy; polyesters; tensile strength
Abstract:
... A series of biobased copolyesters, poly(ethylene sebacate-co-ethylene 2,5-furandicarboxylate) (PESF), were synthesized from available biobased ethylene glycol (EG), sebacic acid (SA) and 2,5-furandicarboxylic acid (FDCA) through a two-step melt polycondensation method. The composition, molecular weight and its distribution, crystal structure, and crystallization behavior of PESFs were investigated ...
DOI:
10.1039/c6ra27795k

5. Characterization of calcium deposition induced by Synechocystis sp. PCC6803 in BG11 culture medium

Author:
Huaxiao Yan; Zuozhen Han; Hui Zhao; Shixue Zhou; Naijie Chi; Mei Han; Xiaoyan Kou; Yan Zhang; Linlin Xu; Chenchen Tian; Song Qin
Source:
Chinese journal of oceanology and limnology 2014 v.32 no.3 pp. 503-510
ISSN:
0254-4059
Subject:
thermal stability; calcite; Synechocystis; crystals; carbon; phosphorus; crystal structure; iron; secondary metabolites; differential scanning calorimetry; transmission electron microscopy; thermal degradation; oxygen; copper; calcium; calcium carbonate; temperature; weight loss; culture media; X-ray diffraction; zinc
Abstract:
... Calcium carbonate (CaCO₃) crystals in their preferred orientation were obtained in BG11 culture media inoculated with Synechocystis sp. PCC6803 (inoculated BG11). In this study, the features of calcium carbonate deposition were investigated. Inoculated BG11 in different calcium ion concentrations was used for the experimental group, while the BG11 culture medium was used for the control group. The ...
DOI:
10.1007/s00343-014-3150-2

6. Characterization of nanoscale retrograded starch prepared by a sonochemical method

Author:
Yongbo Ding; Jianquan Kan
Source:
Stärke = 2016 v.68 no.3-4 pp. 264-273
ISSN:
0038-9056
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; adsorption; amylopectin; amylose; crosslinking; crystal structure; crystals; differential scanning calorimetry; in vitro studies; nanoparticles; scanning electron microscopy; swelling (materials); ultrasonic treatment
Abstract:
... Nanoscale retrograded starch (RS III) particles were prepared using high‐intensity ultrasonication combined with water‐in‐oil (w/o) miniemulsion cross‐linking technique. Results showed that ultrasonication effectively fragmented RS III to nanoparticles 600–700 nm in size. Scanning electron microscopy images showed that ultrasonic treatment produced notches and grooves on the surface of nanoscale R ...
DOI:
10.1002/star.201500313

7. Characterization of new starches separated from different Chinese yam (Dioscorea opposita Thunb.) cultivars

Author:
Wang, S.; Liu, H.; Gao, W.; Chen, H.; Yu, J.; Xiao, P.
Source:
Food chemistry 2006 v.99 no.1 pp. 30-37
ISSN:
0308-8146
Subject:
Dioscorea oppositifolia; cultivars; starch granules; chemical composition; amylose; water binding capacity; crystal structure; swelling (materials); crystals; differential scanning calorimetry; solubility; ultrastructure; yams
Abstract:
... The starches separated from four different Dioscorea opposita Thunb. cultivars were investigated for morphological, thermal, crystal, and physicochemical properties, such as amylose content, swelling power, solubility and water-binding capacity properties. Amylose content of D. oppositastarches from different cultivars ranged from 20.74% to 25.94%. The shape of starch granules separated from diffe ...
DOI:
10.1016/j.foodchem.2005.07.008

8. Characterizing the effects of ambient aging on the mechanical and physical properties of two commercially available bacterial thermoplastics

Author:
W.V. Srubar III; Z.C. Wright; A. Tsui; A.T. Michel; S.L. Billington; C.W. Frank
Source:
Polymer degradation and stability 2012 v.97 no.10 pp. 1922-1929
ISSN:
0141-3910
Subject:
3-hydroxybutyric acid; additives; biopolyesters; crystal structure; crystals; differential scanning calorimetry; extrusion; gas chromatography; gel chromatography; glass transition; melting; modulus of elasticity; molecular weight; temperature; tensile strength; thermoplastics
Abstract:
... Physical aging of commercial poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate)-co-poly(3-hydroxyvalerate) (PHBV) films has been investigated in this work. Aging-related changes in mechanical properties and crystalline matrix morphology were characterized using mechanical tensile tests, gas chromatography, differential scanning calorimetry, and gel permeation chromatography. Both PHB and PH ...
DOI:
10.1016/j.polymdegradstab.2012.04.011

9. Co-crystallization phenomena in biosynthesized isotactic poly[(R)-lactate-co-(R)-2-hydroxybutyrate]s with various lactate unit ratios

Author:
Taizo Kabe; Ken'ichiro Matsumoto; Satsuki Terai; Takaaki Hikima; Masaki Takata; Masahiro Miyake; Seiichi Taguchi; Tadahisa Iwata
Source:
Polymer degradation and stability 2016 v.132 pp. 137-144
ISSN:
0141-3910
Subject:
composite polymers; crystal structure; crystallization; crystals; differential scanning calorimetry; endothermy; glass transition temperature; lactic acid; melting; melting point; microorganisms; polyesters; thermal properties; wide-angle X-ray scattering
Abstract:
... Poly[(R)-lactate-co-(R)-2-hydroxybutyrate], which is biosynthesized as a random co-polyester by microbial organisms, with various ratios of lactic acid (LA) to hydroxybutyrate monomers has been isothermally crystallized to investigate its thermal properties and crystal structure changes. Differential scanning calorimetry on the isothermally crystallized samples detected endothermic peaks due to th ...
DOI:
10.1016/j.polymdegradstab.2016.03.005

10. Comparison of microstructural and physical properties of two petroleum waxes

Author:
Maria Petersson; Ingrid Gustafson; Mats Stading
Source:
Journal of materials science 2008 v.43 no.6 pp. 1869-1879
ISSN:
0022-2461
Subject:
X-ray diffraction; alkanes; confocal laser scanning microscopy; crystal structure; crystallization; crystals; differential scanning calorimetry; hydrophobicity; infrared spectroscopy; lipid content; microstructure; petrolatum; petroleum; rheology; temperature; waxes
Abstract:
... Microstructural and physical properties of two petroleum waxes, petrolatum and microcrystalline wax, were characterized in this work. Petroleum waxes are known to be hydrophobic and can be used in applications where a good moisture barrier is needed. In order to achieve a better understanding of different inherent properties of a wax, the two waxes in this work were characterized with infrared spe ...
DOI:
10.1007/s10853-007-2417-9

11. Compatible and tearing properties of poly(lactic acid)/poly(ethylene glutaric-co-terephthalate) copolyester blends

Author:
Yeh, Jen-Taut; Tsou, Chi-Hui; Lu, Wei; Li, Ya-Ming; Xiao, Han Wen; Huang, Chi-Yuan; Chen, Kan-Nan; Wu, Chin-San; Chai, Wan-Lan
Source:
Journal of polymer science 2010 v.48 no.9 pp. 913-920
ISSN:
0887-6266
Subject:
crystal structure; crystallization; crystals; deformation; differential scanning calorimetry; droplets; glass transition; melting; melting point; mixing; nuclear magnetic resonance spectroscopy; polyesters; polylactic acid; temperature
Abstract:
... Fourier transform infrared and nuclear magnetic resonance results suggest that the carboxylic acid groups of poly(lactic acid) (PLA) molecules react with the hydroxyl groups of FePol (FP) molecules during the melt-blending of PLAxFPy specimens. Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) experiments of PLA and PLA/FP specimens suggest that only small amounts of po ...
DOI:
10.1002/polb.21954

12. Core–Shell Fibers Electrospun from Phase-Separated Blend Solutions: Fiber Formation Mechanism and Unique Energy Dissipation for Synergistic Fiber Toughness

Author:
Wang Chi; Hsiue Ting-Ting
Source:
Biomacromolecules 2017 v.18 no.9 pp. 2906-2917
ISSN:
1526-4602
Subject:
3-hydroxybutyric acid; Fourier transform infrared spectroscopy; X-radiation; biodegradability; crystal structure; crystals; diameter; differential scanning calorimetry; energy; mechanical properties; microstructure; modulus of elasticity; polylactic acid; viscosity; whipping
Abstract:
... Through single-tube electrospinning, the biodegradable core–shell fibers of poly(3-hydroxybutyrate) (PHB) and poly(d,l-lactic acid) (PDLLA) were obtained from blend solutions with different compositions at a total polymer concentration of 7 wt %. Regardless whether PHB is the major or minor component (PHB/PDLLA = 90/10, 75/25, 50/50, and 25/75 wt. ratio), these phase-separated solutions all yielde ...
DOI:
10.1021/acs.biomac.7b00863

13. Corn and Pinhão Starches Modified with Sodium Tripolyphosphate: Thermal, Pasting, Structural and Morphological Properties

Author:
Cleoci Beninca; Raíssa A. Barboza; Cristina S. de Oliveira; Camila D. Bet; Radla Z. B. Bisinella; Egon Schnitzler
Source:
Stärke = 2019 v.71 no.7-8 pp. e1800290
ISSN:
0038-9056
Subject:
X-ray diffraction; corn; corn starch; crystal structure; crystals; differential scanning calorimetry; electron microscopy; enthalpy; gelatinization; pasting properties; sodium tripolyphosphate; starch; temperature; thermal stability; thermogravimetry; viscosity
Abstract:
... Pinhão and corn starches are submitted to phosphating with sodium tripolyphosphate and their properties are evaluated by thermogravimetry, differential scanning calorimetry, viscoamylography, X‐ray powder diffractometry, field emission gun‐scanning electron microscopy analysis. The phosphating process is divided into three steps to analyse the behaviour of the sample on exposure to phosphate group ...
DOI:
10.1002/star.201800290

14. Crystalline Structure Changes in Preoriented Metallocene-Based Isotactic Polypropylene upon Annealing

Author:
Wang Yan; Xu Jia-Zhuang; Chen Yan-Hui; Qiao Kai; Xu Ling; Ji Xu; Li Zhong-Ming; Hsiao Benjamin S.
Source:
Journal of physical chemistry 2013 v.117 no.23 pp. 7113-7122
ISSN:
1520-5207
Subject:
X-radiation; X-ray diffraction; annealing; chemical elements; crystal structure; crystallization; crystals; differential scanning calorimetry; melting; polypropylenes; temperature; thermal stability; topology
Abstract:
... Partially melted metallocene-based isotactic polypropylene (m-iPP), which was preoriented with a high degree of molecular orientation and a shish-kebab structure, was annealed at various temperatures and isothermally crystallized at 130 °C. The melting and crystallization process was examined using synchrotron wide-angle X-ray diffraction, small-angle X-ray scattering, and differential scanning ca ...
DOI:
10.1021/jp400847p

15. Crystalline structures and mesomorphic properties of gemini diammonium surfactants with a pendant hydroxyl group

Author:
Zengbin Wei; Xilian Wei; Dezhi Sun; Jiuqiang Liu; Xiaojuan Tang
Source:
Journal of colloid and interface science 2011 v.354 no.2 pp. 677-685
ISSN:
0021-9797
Subject:
X-ray diffraction; crystal structure; crystals; differential scanning calorimetry; hydrogen bonding; melting point; microscopy; surfactants; temperature; viscosity
Abstract:
... A series of homologous crystals of gemini diammonium surfactants (GDAS) containing one hydroxyl substituted methylene spacer are prepared. The crystal structures of these compounds, namely [CₙH₂ ₙ ₊₁–N⁺ (CH₃)₂–CH₂CH(OH)CH₂–N⁺(CH₃)₂–CₙH₂ ₙ ₊₁], are determined by single-crystal X-ray diffraction techniques, in order to have a better understanding of the structure relation between the solid and the m ...
DOI:
10.1016/j.jcis.2010.11.009

16. Crystallinity and quality of spray-dried lactose powder improved by soluble soybean polysaccharide

Author:
Xueqian Shi; Qixin Zhong
Source:
Lebensmittel-Wissenschaft + Technologie 2015 v.62 no.1 pp. 89-96
ISSN:
0023-6438
Subject:
X-ray diffraction; crystal structure; crystallization; crystals; dairy products; differential scanning calorimetry; lactose; light microscopy; polarized light; polysaccharides; relative humidity; shelf life; sorption; soybeans; spectroscopy; spray drying; water content
Abstract:
... The crystallinity of lactose is significant to the quality and shelf-life of spray-dried dairy products. In this study, the properties of spray-dried lactose powder were studied after co-spray drying with soluble soybean polysaccharide (SSPS) at mass ratios of 1:0, 19:1 and 9:1. Spray-dried samples with SSPS had the significantly increased crystallinity based on polarized light microscopy, differe ...
DOI:
10.1016/j.lwt.2015.01.024

17. Crystallization Behavior and Crystal Orientation of Poly(ε-caprolactone) Homopolymers Confined in Nanocylinders: Effects of Nanocylinder Dimension

Author:
Nakagawa Shintaro; Kadena Ken-ichi; Ishizone Takashi; Nojima Shuichi; Shimizu Takafumi; Yamaguchi Kazuo; Nakahama Seiichi
Source:
Macromolecules 2012 v.45 no.4 pp. 1892-1900
ISSN:
1520-5835
Subject:
composite polymers; crystal structure; crystallization; crystals; differential scanning calorimetry; moieties; ultraviolet radiation; wide-angle X-ray scattering
Abstract:
... The crystallization behavior and crystal orientation of poly(ε-caprolactone) (PCL) homopolymers and PCL blocks spatially confined in identical nanocylinders have been investigated using differential scanning calorimetry (DSC) and two-dimensional wide-angle X-ray diffraction (WAXD) as a function of cylinder diameter D. The PCL homopolymers confined in nanocylinders were prepared using microphase se ...
DOI:
10.1021/ma202566f

18. Crystallization and melting behavior of poly (ethylene succinate) in presence of graphene nanoplatelets

Author:
Ahmad Asadinezhad; Hossein Ali Khonakdar; Liane Häuβler; Udo Wagenknecht; Gert Heinrich
Source:
Thermochimica acta 2014 v.586 pp. 17-24
ISSN:
0040-6031
Subject:
cold; crystal structure; crystallization; crystals; differential scanning calorimetry; enthalpy; graphene; melting; nanocomposites; polymers; temperature; thermal properties
Abstract:
... In this study, poly (ethylene succinate)/graphene nanoplatelets composites were prepared via solution casting method in different compositions and analyzed via differential scanning calorimetry. Crystallization and melting characteristics in both dynamic (non-isothermal) and isothermal modes were investigated at various cooling rates and isothermal temperatures. It was confirmed that graphene, whi ...
DOI:
10.1016/j.tca.2014.03.048

19. Crystallization and melting properties of extra virgin olive oil studied by synchrotron XRD and DSC

Author:
Luisa Barba; Gianmichele Arrighetti; Sonia Calligaris
Source:
European journal of lipid science and technology 2013 v.115 no.3 pp. 322-329
ISSN:
1438-7697
Subject:
cell structures; crystal structure; crystallization; crystals; differential scanning calorimetry; extra-virgin olive oil; heat treatment; melting; models; monitoring; triacylglycerols
Abstract:
... Crystallization and melting properties of triacylglycerols in extra virgin olive oil were studied by using synchrotron X‐ray diffraction (XRD) and differential scanning calorimetry (DSC). The phase transitions were monitored by cooling and heating the samples at 2°C/min from 60 to −60°C and vice versa. Upon cooling, a first DSC endothermic peak was recorded at −9.6°C followed by one at −33.5°C. Th ...
DOI:
10.1002/ejlt.201200259

20. Crystallization and temperature-dependent structure deflection of C₆mimBr ionic liquid intercalated in LAPONITE®

Author:
Fangling Jiang; Cheng Li; Xiaojing Guo; Haiying Fu; Guozhong Wu; Shimou Chen
Source:
RSC advances 2016 v.6 no.100 pp. 98018-98025
ISSN:
2046-2069
Subject:
X-ray absorption spectroscopy; X-ray diffraction; ambient temperature; bromine; cations; crystal structure; crystallization; crystals; differential scanning calorimetry; hydrogen bonding; ionic liquids; nanopores; physicochemical properties; transmission electron microscopy
Abstract:
... The physicochemical properties of large molecules confined in nanopores are expected to be different from those of the bulk. This study investigates the cation–anion relative position and the molecular orientation of the 1-hexyl-3-methylimidazolium bromide (C₆mimBr) ionic liquid intercalated in LAPONITE® by a temperature-dependent X-ray absorption fine structure (XAFS) and some traditional methods ...
DOI:
10.1039/c6ra18618a

21. Crystallization-induced aging in poly(trimethylene terephthalate)/ poly(ethylene oxide terephthalate) segmented block copolymers

Author:
Yao, Chenguang; Yang, Guisheng
Source:
Journal of polymer science 2010 v.48 no.4 pp. 411-416
ISSN:
0887-6266
Subject:
X-ray diffraction; annealing; biodegradable products; composite polymers; crystal structure; crystals; differential scanning calorimetry; ethylene oxide; mechanical properties; molecular weight; scanning electron microscopes
Abstract:
... A new type poly(ether-ester) based on poly(trimethylene terephthalate) as rigid segments and poly(ethylene oxide terephthalate) as soft segments was synthesized and its aging behavior were investigated. Different from other polymer, the segmented block copolymers exhibited a unique aging mechanism. That is, the degradation of mechanical property within short term annealing was due to the overgrown ...
DOI:
10.1002/polb.21901

22. Effect of Asphaltenes on the Structure and Surface Properties of Wax Crystals in Waxy Oils

Author:
Huiyong Xue; Jinjun Zhang; Shanpeng Han; Mengran Sun; Xiaohan Yan; Hongying Li
Source:
Energy & fuels 2019 v.33 no.10 pp. 9570-9584
ISSN:
1520-5029
Subject:
X-ray diffraction; asphaltenes; crystal structure; crystallization; crystals; differential scanning calorimetry; electrostatic interactions; equations; fractal dimensions; gel strength; gelation; gels; oils; petroleum; zeta potential
Abstract:
... Asphaltenes, as the most polar component of crude oils, may interact with wax molecules during the wax crystallization, thus changing wax precipitation characteristics and wax crystal structure and affecting the gelation behavior of crude oils. In the present work, waxy model oils of variable asphaltene contents (0–0.20 wt %) were prepared in order to systematically examine the effect of asphalten ...
DOI:
10.1021/acs.energyfuels.9b01825

23. Effect of Heteroaromatic Pendants in Comb Copolymers on Paraffin Crystallization and Cold Flow Ability of Crude Oil

Author:
Zhao Hanqing; Xu Jun; Li Tao; Wang Tongshuai; Wei Xiaoming; Wang Jie; Xu Yisheng; Li Li; Guo Xuhong
Source:
Energy & Fuels 2016 v.30 no.7 pp. 5398-5403
ISSN:
1520-5029
Subject:
X-ray diffraction; additives; alkanes; composite polymers; crystal structure; crystallization; crystals; differential scanning calorimetry; heterocyclic compounds; hydrogen bonding; light microscopy; maleic acid; maleic anhydrides; models; oils; petroleum; temperature
Abstract:
... Adding comb copolymers as chemical additives is considered an effective and convenient method to improve the cold flow ability of crude oils. To improve the effectiveness of comb copolymers on the flow ability modification for crude oils with asphaltenes, poly(maleic acid amide-α-octadecene) with benzimidazolyl pendants (MACB) were designed and synthesized. In comparison to reported comb maleic an ...
DOI:
10.1021/acs.energyfuels.6b00451

24. Effect of Polyethylene-Vinyl Acetate Pour Point Depressants on the Flow Behavior of Degassed Changqing Waxy Crude Oil before/after scCO₂ Extraction

Author:
Shuang Yang; Chuanxian Li; Fei Yang; Xiaoteng Li; Guangyu Sun; Bo Yao
Source:
Energy & fuels 2019 v.33 no.6 pp. 4931-4938
ISSN:
1520-5029
Subject:
acetates; asphaltenes; carbon dioxide; crystal structure; crystals; differential scanning calorimetry; modulus of elasticity; oil fields; particle size; petroleum; pipelines; pour point; scanning electron microscopy; solubility; temperature; transportation; viscosity
Abstract:
... For the pipeline transportation of waxy crude oil, pour point depressants (PPDs) have been developed and used to improve its flowability at low temperature. As supercritical CO₂ (scCO₂) flooding becomes a common technique to improve oilfield recovery, how the sensitivity of PPD changes due to the degassed crude oil treated by CO₂ should be studied. In this work, the effect of scCO₂ extraction on t ...
DOI:
10.1021/acs.energyfuels.9b00561

25. Effect of crystal form and particle size of titanium dioxide on the photodegradation behaviour of ethylene-vinyl acetate copolymer/low density polyethylene composite

Author:
Zhongyang Liu; Jing Jin; Shuangjun Chen; Jun Zhang
Source:
Polymer degradation and stability 2011 v.96 no.1 pp. 43-50
ISSN:
0141-3910
Subject:
Fourier transform infrared spectroscopy; acetates; annealing; color; composite polymers; correlation; crystal structure; crystallization; crystals; differential scanning calorimetry; mechanical properties; nanocomposites; particle size; photolysis; photostability; polyethylene; thermogravimetry; titanium dioxide; ultraviolet radiation
Abstract:
... The photodegradation behaviour of ethylene-vinyl acetate copolymer (EVA)/low density polyethylene (LDPE) composite containing four different types of titanium dioxide (TiO₂) was investigated through colour difference, Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and mechanical tests. The results showed that the performanc ...
DOI:
10.1016/j.polymdegradstab.2010.11.010

26. Effect of polar rotation on the formation of porous poly(vinylidene fluoride) membranes by immersion precipitation in an alcohol bath

Author:
Hsu-Hsien Chang; Liang-Kuei Chang; Cheng-Dau Yang; Dar-Jong Lin; Liao-Ping Cheng
Source:
Journal of membrane science 2016 v.513 pp. 186-196
ISSN:
0376-7388
Subject:
Fourier transform infrared spectroscopy; Hydrangea; X-ray diffraction; artificial membranes; butanol; coagulants; crystal structure; crystals; differential scanning calorimetry; flowers; fluorides; isopropyl alcohol; nuclear magnetic resonance spectroscopy; porous media
Abstract:
... Microporous poly(vinylidene fluoride) (PVDF) membranes were prepared by isothermal immersion-precipitation of PVDF/N,N-dimethylformamide (DMF) casting dopes in different alcohol baths. The formed membranes can be divided into two groups, based on the morphology and crystal type of the globular particles constituting the membrane matrix. The particles in the first group of membranes appear like a h ...
DOI:
10.1016/j.memsci.2016.04.052

27. Effect of temperature on the thermal property and crystallization behavior of poly (lactic acid) porous membrane prepared via phase separation induced by water microdroplets

Author:
Han Wang; Weihua Qiao; Sitian Ma; Linfeng Wang; Changjun Liu; Yingshan Zhou; Shaojin Gu; Weilin Xu; Jiawei Shi; Hongjun Yang
Source:
International journal of biological macromolecules 2020 v.147 pp. 1185-1192
ISSN:
0141-8130
Subject:
X-ray diffraction; ambient temperature; crystal structure; crystallization; crystals; differential scanning calorimetry; melting; polylactic acid; separation; thermal stability; thermogravimetry
Abstract:
... Poly (lactic acid) (PLA)-based porous membrane were fabricated through phase separation induced by water microdroplets at different ambient temperature to unravel the relationship between the physical properties (including thermal properties and crystallization) and preparation temperature. Cross-sectional scanning electron micrographs revealed that the thickness of the membrane decreases with inc ...
DOI:
10.1016/j.ijbiomac.2019.10.088

28. Effects of Mono‐, Di‐, and Tri‐Saccharides on the Stability and Crystallization of Amorphous Sucrose

Author:
Alpana A. Thorat; Laurent Forny; Vincent Meunier; Lynne S. Taylor; Lisa J. Mauer
Source:
Journal of food science 2018 v.83 no.11 pp. 2827-2839
ISSN:
0022-1147
Subject:
X-ray diffraction; additives; cellobiose; crystal structure; crystallization; crystals; differential scanning calorimetry; environmental factors; foods; freeze drying; fructose; glass transition temperature; glucose; isomaltulose; lactose; maltose; maltotriose; microscopy; molecular weight; raffinose; relative humidity; shelf life; storage temperature; sucrose; texture; trehalose; water content
Abstract:
... Amorphous sucrose is a component of many food products but is prone to crystallize over time, thereby altering product quality and limiting shelf‐life. A systematic investigation was conducted to determine the effects of two monosaccharides (glucose and fructose), five disaccharides (lactose, maltose, trehalose, isomaltulose, and cellobiose), and two trisaccharides (maltotriose and raffinose) on t ...
DOI:
10.1111/1750-3841.14357

29. Epitaxial crystallization of precisely bromine-substituted polyethylene induced by carbon nanotubes and graphene

Author:
Weijun Miao; Bingjie Wang; Yiguo Li; Wenge Zheng; Hongbing Chen; Li Zhang; Zongbao Wang
Source:
RSC advances 2017 v.7 no.29 pp. 17640-17649
ISSN:
2046-2069
Subject:
X-ray diffraction; carbon nanotubes; crystal structure; crystallization; crystals; differential scanning calorimetry; graphene; graphene oxide; melting point; models; nanocomposites; polyethylene; polyolefin; temperature; transmission electron microscopy
Abstract:
... Precisely substituted polyethylenes have well-defined primary structures and aggregation architecture. Herein, precisely bromine-substituted polyethylene (PE21Br) was chosen as an ideal model to investigate the substituent impact on epitaxial crystallization upon one-dimensional carbon nanotubes (CNT) and two-dimensional reduced graphene oxide (RGO) via solution crystallization. The abilities of d ...
DOI:
10.1039/c7ra00958e

30. Formulation design, preparation and physicochemical characterizations of solid lipid nanoparticles containing a hydrophobic drug: Effects of process variables

Author:
Surajit Das; Wai Kiong Ng; Parijat Kanaujia; Sanggu Kim; Reginald B.H. Tan
Source:
Colloids and surfaces 2011 v.88 no.1 pp. 483-489
ISSN:
0927-7765
Subject:
X-ray diffraction; absorption; bioavailability; colloids; crystal structure; crystals; differential scanning calorimetry; drug carriers; drugs; encapsulation; hydrophobicity; light microscopy; lipids; nanoparticles; particle size; scanning electron microscopy; solubility; zeta potential
Abstract:
... This study aimed to prepare solid lipid nanoparticles (SLNs) of a hydrophobic drug, tretinoin, by emulsification–ultrasonication method. Solubility of tretinoin in the solid lipids was examined. Effects of process variables were investigated on particle size, polydispersity index (PI), zeta potential (ZP), drug encapsulation efficiency (EE), and drug loading (L) of the SLNs. Shape and surface morp ...
DOI:
10.1016/j.colsurfb.2011.07.036

31. Free poly(l‐lactic acid) spherulites grown from thermally induced phase separation and crystallization kinetics

Author:
Ruilai Liu; Kaina Li; Min Liu; Yingying Liu; Haiqing Liu
Source:
Journal of polymer science 2014 v.52 no.22 pp. 1476-1489
ISSN:
0887-6266
Subject:
X-ray diffraction; additives; adsorption; biomedical materials; catalysts; crystal structure; crystallization; crystals; differential scanning calorimetry; equations; melting; molecular conformation; nanofibers; polylactic acid; polymerization; porosity; scanning electron microscopy; separation; temperature; tetrahydrofuran
Abstract:
... Free poly(L‐lactic acid) (PLLA) sheaves and spherulites were prepared by thermally induced phase separation method from its tetrahydrofuran solution without the assistance of other additives. The effects of variables such as polymer concentration, quenching temperature and time on the morphology of PLLA spherulites were studied. The morphology, size, degree of crystallinity, and crystal structure ...
DOI:
10.1002/polb.23587

32. Fully Isotactic Poly(p-methylstyrene): Precise Synthesis via Catalytic Polymerization and Crystallization Studies

Author:
Tianyu Wu; Luis Valencia; Thomas Pfohl; Barbara Heck; Günter Reiter; Pierre J. Lutz; Rolf Mülhaupt
Source:
Macromolecules 2019 v.52 no.13 pp. 4839-4846
ISSN:
1520-5835
Subject:
X-ray diffraction; annealing; atomic force microscopy; catalysts; catalytic activity; crystal structure; crystallization; crystals; differential scanning calorimetry; evaporation rate; heat; light microscopy; melting point; polymerization; polymers; small-angle X-ray scattering; solvents; titanium; vapors
Abstract:
... The synthesis of stereoregular styrenic polymers on single-site catalysts has received great attention over the last decades; however, little is known with respect to tailoring fully isotactic poly(p-methylstyrene) (iPpMS). Here, we demonstrate that isospecific coordination polymerization of p-methylstyrene can be achieved in the presence of the catalyst dichloro[1,4-dithiabutanediyl-2,20-bis(4,6- ...
DOI:
10.1021/acs.macromol.9b00640

33. Impact of Molecular Weight on the Thermal Stability and the Miscibility of Poly(ε-caprolactone)/Polystyrene Binary Blends

Author:
Al Mamun; S. M. Mujibur Rahman; Sébastien Roland; Rizwan Mahmood
Source:
Journal of polymers and the environment 2018 v.26 no.8 pp. 3511-3519
ISSN:
1566-2543
Subject:
crystal structure; crystallization; crystals; differential scanning calorimetry; enthalpy; melting point; molecular weight; polystyrenes; temperature; thermal stability; thermogravimetry
Abstract:
... Poly(ε-caprolactone) (PCL) and two different molecular weight (6K and 650K) of polystyrene (PS) were mixed in solution to prepare binary blends of PCL/PS with various compositions. The impact of the molecular weight of PS in the blends was studied on thermal stability and miscibility by the thermogravimetric analysis (TGA) and the differential scanning calorimetry (DSC) method. The TGA results und ...
DOI:
10.1007/s10924-018-1236-1

34. Impact of hot-stretching treatment on physical and mechanical properties of braided polyamide suture

Author:
Faten Debbabi; Saber B Abdessalem
Source:
Textile research journal v.86 no.7 pp. 696-709
ISSN:
1746-7748
Subject:
crystal structure; crystals; manufacturing; polyamides; shrinkage; sutures; temperature; tensile strength
Abstract:
... Suture is the most used implant in the human body, but it is not yet perfect. Braided polyamide sutures have to undergo several manufacturing steps, including hot-stretching. The main objective of this work was to analyze physical structural changes of polyamide fibers after the hot-stretching step and to highlight mechanical property changes related to this treatment. The obtained results showed ...
DOI:
10.1177/0040517514566108

35. In search of confectionary fat blends stable to heat: Hydrogenated palm kernel oil stearin with sorbitan monostearate

Author:
Fernanda Peyronel; Alejandro G. Marangoni
Source:
Food research international 2014 v.55 pp. 93-102
ISSN:
0963-9969
Subject:
X-ray diffraction; cocoa butter; crystal structure; crystallization; crystals; differential scanning calorimetry; heat stability; heat tolerance; melting; microstructure; palm kernel oil; polarized light; stearin; storage modulus; sweets
Abstract:
... The potential of sorbitan monostearate (SMS) addition to change the basic-crystal-structure of a confectionary fat blend (CFB) with the aim to enhance its heat resistance was investigated. The CFB used in this study was a blend of hydrogenated palm kernel oil stearin, lecithin, polyglycerol polyricinoleate (PGPR) and cocoa butter. Samples made with different proportions of SMS to CFB were prepared ...
DOI:
10.1016/j.foodres.2013.10.036

36. In vitro and in vivo evaluation of clarithromycin–urea solid dispersions prepared by solvent evaporation, electrospraying and freeze drying methods

Author:
Ghobad Mohammadi; Vahid Hemati; Mohammad-Reza Nikbakht; Shahla Mirzaee; Ali Fattahi; Kiomars Ghanbari; Khosro Adibkia
Source:
Powder technology 2014 v.257 pp. 168-174
ISSN:
0032-5910
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; bioavailability; clarithromycin; crystal structure; crystals; differential scanning calorimetry; dispersions; drugs; electrospraying; evaporation; freeze drying; in vivo studies; pharmacokinetics; powders; rabbits; scanning electron microscopy; solvents; urea; water solubility
Abstract:
... Clarithromycin, a poorly water soluble drug, is a new broad spectrum macrolide antibiotic, used in many infections. The objective of the present study was to prepare clarithromycin–urea solid dispersions, with a view to improve the drug dissolution rate and oral bioavailability. The solid dispersions were prepared by solvent evaporation, electrospraying and freeze drying methods in 3 different rat ...
DOI:
10.1016/j.powtec.2014.03.014

37. Influences of melt-draw ratio and annealing on the crystalline structure and orientation of poly(4-methyl-1-pentene) casting films

Author:
Ai-ping Ma; Li-yang Xu; Bo Yin; Ming-bo Yang; Bang-hu Xie
Source:
RSC advances 2016 v.6 no.67 pp. 62038-62044
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; annealing; crystal structure; crystals; differential scanning calorimetry; melting; scanning electron microscopy; temperature
Abstract:
... Poly(4-methyl-1-pentene) casting films with row-nucleated lamellar structure were extruded through a slit die followed by stretching using a chill roll. The influences of melt draw ratio, annealing temperature, annealing time and supplied strain level on the crystalline morphology and orientation of the poly(4-methyl-1-pentene) casting films were carefully investigated by means of scanning electro ...
DOI:
10.1039/c6ra08156h

38. Insights into the physicochemical properties of coffee oil

Author:
Calligaris, Sonia; Munari, Marina; Arrighetti, Gianmichele; Barba, Luisa
Source:
European journal of lipid science and technology 2009 v.111 no.12 pp. 1270-1277
ISSN:
1438-7697
Subject:
Coffea arabica; X-ray diffraction; coffee beans; crystal structure; crystallization; crystals; differential scanning calorimetry; fatty acid composition; flavor; flavorings; foods; ingredients; linoleic acid; oils; physical properties; physicochemical properties; stearic acid
Abstract:
... The lipid fraction of roasted coffee is an interesting ingredient that could be used in a large number of food formulations. Coffee oil has peculiar flavouring as well as nutraceutical characteristics. The feasibility of the use of coffee oil as ingredient greatly depends not only on its chemical characteristics but also on its physical properties. The crystallisation and melting properties of the ...
DOI:
10.1002/ejlt.200900042

39. Investigation of the drawing mechanism of UHMWPE fibers

Author:
Jen-Taut Yeh; Shui-Chuan Lin; Cheng-Wei Tu; Kuo-Huang Hsie; Feng-Chih Chang
Source:
Journal of materials science 2008 v.43 no.14 pp. 4892-4900
ISSN:
0022-2461
Subject:
anisotropy; crystal structure; crystals; differential scanning calorimetry; molecular weight; phase transition; polyethylene; scanning electron microscopy; wide-angle X-ray scattering
Abstract:
... The influence of draw ratios (DR) of gel-spun ultrahigh molecular weight polyethylene (UHMWPE) fibers on resultant morphologies, tensile, degrees of orientation, and crystal phase transition properties were investigated using wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). The anisotropic crystalline structure with full concentr ...
DOI:
10.1007/s10853-008-2711-1

40. Liquid–solid transition in mesophase separated olefin multiblock copolymers during crystallization

Author:
Peng He; Bin Chen; Wei Yu; Chixing Zhou
Source:
RSC advances 2015 v.5 no.51 pp. 40607-40619
ISSN:
2046-2069
Subject:
composite polymers; crystal structure; crystallization; crystals; differential scanning calorimetry; light microscopy; melting; olefin; rheology; viscoelasticity
Abstract:
... The effect of block structure on the liquid–solid transition (LST) of ethylene–octene multiblock copolymers (OBCs) during isothermal crystallization has been investigated by rheology, differential scanning calorimetry (DSC), and polarized optical microscopy (POM). Due to the mesophase separation in OBC melts, the formation of a critical network at the LST in the OBCs with low crystallinity (7–14 w ...
DOI:
10.1039/c5ra05030h

41. Melting behavior of a poly(ether-block-amide) copolymer melt-crystallized under quiescent, isothermal conditions

Author:
Guo, Xiaoping
Source:
Journal of polymer science 2008 v.46 no.19 pp. 2035-2046
ISSN:
0887-6266
Subject:
X-radiation; annealing; composite polymers; crystal structure; crystallization; crystals; differential scanning calorimetry; heat; melting; polyamides; thermal properties; thermoplastics
Abstract:
... Segmented poly(ether-block-amide) copolymers are typically known as polyamide-based thermoplastic elastomers consisting of hard, crystallizable polyamide block and flexible, amorphous polyether block. The melting characteristics of a poly(ether-block-amide) copolymer melt-crystallized under various quiescent, isothermal conditions were calorimetrically investigated using differential scanning calo ...
DOI:
10.1002/polb.21538

42. Metal–organic framework in an l-arginine copper(ii) ion polymer: structure, properties, theoretical studies and microbiological activity

Author:
Agnieszka Wojciechowska; Anna Gągor; Wiktor Zierkiewicz; Anna Jarząb; Agnieszka Dylong; Marek Duczmal
Source:
RSC advances 2015 v.5 no.46 pp. 36295-36306
ISSN:
2046-2069
Subject:
Bacillus subtilis; Candida albicans; Enterococcus hirae; Escherichia coli; Fourier transform infrared spectroscopy; Gram-negative bacteria; Pseudomonas aeruginosa; Raman spectroscopy; Saccharomyces cerevisiae; Salmonella enterica; Shigella flexneri; Staphylococcus aureus; Streptococcus mutans; X-ray diffraction; antimicrobial properties; arginine; coordination polymers; copper; crystal structure; crystallization; crystals; differential scanning calorimetry; electron paramagnetic resonance spectroscopy; fungi; geometry; growth retardation; ligands; magnetism; models; nitrogen; oxygen; thermogravimetry; zwitterions
Abstract:
... A novel 1D polymeric copper(ii) complex with l-arginine and a linear bridged 4,4′-bipyridine with a formula of {[Cu(l-Arg)₂(μ-4,4′-bpy)]Cl₂·3H₂O}∞ (1) (where l-Arg = l-arginine, 4,4′-bpy = 4,4′-bipyridine) was synthesized. The crystal structure and properties of the product were characterized using X-ray diffraction, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), spectr ...
DOI:
10.1039/c5ra02790j

43. Non-isothermal melt crystallization of poly(tetramethylene succinate) under high pressure: Characterization and kinetics

Author:
David Rohindra; Keiichi Kuboyama; Toshiaki Ougizawa
Source:
Thermochimica acta 2012 v.545 no. pp. 26-33
ISSN:
0040-6031
Subject:
microscopy; temperature; X-ray diffraction; crystal structure; crystals; models; differential scanning calorimetry; melting point; crystallization; melting; heat production; X-radiation
Abstract:
... The non-isothermal melt crystallization behavior (characterization and kinetics) of poly(tetramethylene succinate) (PTMS) under high pressure was investigated using high pressure differential thermal analysis (HP-DTA). Wide angle X-ray diffraction (WAXD), small angle X-ray scattering (SAXS), differential scanning calorimetry (DSC), polarized optical microscopy (POM), and density measurement were u ...
DOI:
10.1016/j.tca.2012.06.022

44. Nucleating effect of multi-walled carbon nanotubes and graphene on the crystallization kinetics and melting behavior of olefin block copolymers

Author:
Siduo Wu; Hui Li; Guangsu Huang; Jinrong Wu
Source:
RSC advances 2014 v.4 no.36 pp. 19024-19033
ISSN:
2046-2069
Subject:
X-ray diffraction; activation energy; carbon nanotubes; composite polymers; crystal structure; crystallization; crystals; differential scanning calorimetry; energy; graphene; heat; light microscopy; melting; mixing; nanocomposites; nanoparticles; olefin; temperature; thermal properties; wide-angle X-ray scattering
Abstract:
... Crystallization is of primary importance to the properties of olefin block copolymers (OBCs). In the present work, multi-walled carbon nanotubes (MWCNTs) and graphene are used as nucleating agents for the crystallization of OBC. Thus nanocomposites of OBC filled with MWCNTs and graphene were prepared by solution blending. Differential scanning calorimetry (DSC) tests were carried out to study the ...
DOI:
10.1039/c4ra01776e

45. Palmitoylethanolamide sub-micronization using fast precipitation followed by supercritical fluids extraction

Author:
R. Campardelli; E. Oleandro; M. Scognamiglio; G. Della Porta; E. Reverchon
Source:
Powder technology 2017 v.305 pp. 217-225
ISSN:
0032-5910
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; acetone; crystal structure; crystallization; crystals; differential scanning calorimetry; dimethyl sulfoxide; ethanol; ethyl acetate; isopropyl alcohol; milling; powders; solvents; supercritical fluid extraction; surfactants
Abstract:
... Sub-micronization of palmitoylethanolamide (PEA) was successfully performed using fast precipitation coupled with supercritical fluid extraction. Different solvents were tested: acetone, ethyl acetate, isopropanol, dimethyl sulfoxide and ethanol; water was used as the antisolvent. PEA precipitated in all cases as crystals of hexagonal morphology. The best result in terms of control of dimension of ...
DOI:
10.1016/j.powtec.2016.09.084

46. Phase Transformation Behavior of Polylactide Probed by Small Angle Light Scattering and Calorimetry

Author:
Nico Schmidt; Susanne Keuker‐Baumann; Jörg Meyer; Klaus Huber
Source:
Journal of polymer science 2019 v.57 no.22 pp. 1483-1495
ISSN:
0887-6266
Subject:
crystal structure; crystallization; crystals; differential scanning calorimetry; heat flow; light scattering; melting; polylactic acid; temperature
Abstract:
... Small angle light scattering (SALS) and differential scanning calorimetry DSC have been applied to investigate the melting of spherulites isothermally crystallized polylactide. At an isothermal crystallization temperature high enough, pure α‐phase crystals are formed. Exposed to a temperature gradient, the crystals first melt and then recrystallize before they finally melt. With decreasing crystal ...
DOI:
10.1002/polb.24892

47. Physical approach for a quantitative analysis of the phytosterols in free phytosterol-oil blends by X-ray Rietveld method

Author:
M. Gomes Silva; V.S. Santos; G.D. Fernandes; G.A. Calligaris; M.H.A. Santana; L.P. Cardoso; A.P.B. Ribeiro
Source:
Food research international 2019 v.124 pp. 2-15
ISSN:
0963-9969
Subject:
X-radiation; X-ray diffraction; chemical composition; crystal structure; crystallization; crystals; differential scanning calorimetry; fatty acids; mixing; model food systems; quantitative analysis; stigmasterol; sunflower oil; thermal properties; triacylglycerols
Abstract:
... This study investigates and compares the thermal phase transition and crystallization characteristics of a commercial food grade free phytosterol blend (FP) with a stigmasterol analytical standard (SS), the FP behavior in a food model system after its addition to high oleic sunflower oil (HOSO). The properties of the FP:HOSO blends were studied by differential scanning calorimetry, solid content, ...
DOI:
10.1016/j.foodres.2019.04.006

48. Physical properties and cookie-making performance of oleogels prepared with crude and refined soybean oil: a comparative study

Author:
Muxin Zhao; Yang Lan; Leqi Cui; Ewumbua Monono; Jiajia Rao; Bingcan Chen
Source:
Food & function 2020 v.11 no.3 pp. 2498-2508
ISSN:
2042-650X
Subject:
X-ray diffraction; bakery industry; beta-sitosterol; comparative study; cookies; crystal structure; crystals; differential scanning calorimetry; hardness; oleogels; polarized light microscopy; soybean oil; soybeans; texture; thermal properties; vegetable shortening
Abstract:
... The objective of this research was to fabricate crude soybean oil oleogels (CSO) using β-sitosterol (BS) and/or monoacylglycerol (MAG) and compare their role with that of refined soybean oil oleogels (RSO) in cookie making. Both crude and refined soybean oil oleogels were formed with BS or MAG, or the combination of both (1 : 1) at a fixed concentration of 10 wt%. The thermal behavior of the oleog ...
DOI:
10.1039/c9fo02180a

49. Preparation and characterization of cationic dyeable polycaprolactam modified with 5-sulfoisophthalic acid sodium and poly(ethylene glycol)

Author:
Li-Kun Xiong; Cui-Yu Yin
Source:
Textile research journal v.87 no.4 pp. 433-443
ISSN:
1746-7748
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; color; composite polymers; crystal structure; crystals; differential scanning calorimetry; dyeing; mechanical properties; methylene blue; nylon; polyamides; polyethylene glycol; rheological properties; sodium; temperature; thermal properties; thermogravimetry; wide-angle X-ray scattering
Abstract:
... Unmodified nylon is dyeable to a single color only, and is almost exclusively dyed with acid dyes that are absorbed with amine groups of nylon molecules. Two types of polycaprolactam (PA6) copolyamide were successfully prepared with 5-sulfoisophthalic acid monosodium salt and poly(ethylene glycol) (PEG) units named cationic dyeable polyamide (CD-PA6) and easy cationic dyeable polyamide (ECD-PA6). ...
DOI:
10.1177/0040517516631322

50. Preparation and characterization of cefquinome sulfate microparticles for transdermal delivery by negative-pressure cavitation antisolvent precipitation

Author:
Xinxuan Du; Suchong Zu; Fengli Chen; Zaizhi Liu; Xinran Li; Lei Yang; Yuangang Zu; Xiuhua Zhao; Lin Zhang
Source:
Powder technology 2016 v.294 pp. 429-436
ISSN:
0032-5910
Subject:
X-ray diffraction; anti-inflammatory activity; crystal structure; crystals; differential scanning calorimetry; dimethyl sulfoxide; ethanol; microparticles; particle size; permeability; physicochemical properties; powders; scanning electron microscopy; solvents; sulfates
Abstract:
... The objective of this study was to prepare micronized cefquinome sulfate by negative-pressure cavitation antisolvent precipitation to improve its permeability and transdermal absorbability. Dimethylsulfoxide and ethanol were used as the solvent and anti-solvent, respectively. The effects of operating parameters, including cefquinome sulfate concentration, volume ratio of antisolvent to solvent, an ...
DOI:
10.1016/j.powtec.2016.03.008

51. Preparation, characterization, and biodegradation of poly(butylene succinate)/cellulose triacetate blends

Author:
Ke Shi; Yun Liu; Xueyan Hu; Tingting Su; Ping Li; Zhanyong Wang
Source:
International journal of biological macromolecules 2018 v.114 pp. 373-380
ISSN:
0141-8130
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; biodegradation; cellulose; chloroform; contact angle; crystal structure; crystals; differential scanning calorimetry; hydrophilicity; modulus of elasticity; scanning electron microscopy; separation; solvents; succinic acid; tensile strength; thermogravimetry; weight loss
Abstract:
... Poly(butylene succinate) (PBS) and cellulose triacetate (CT) were blended using chloroform as solvent. The solid-state properties of PBS/CT blends were confirmed by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), thermogravimetric analysis, scanning electron microscopy (SEM), and water contact angle measurements. FTIR results show t ...
DOI:
10.1016/j.ijbiomac.2018.03.151

52. Preparation, characterization, and thermo-mechanical properties of poly (ε-caprolactone)-piperazine-based polyurethane-urea shape memory polymers

Author:
Alireza Eyvazzadeh Kalajahi; Mostafa Rezaei; Farhang Abbasi
Source:
Journal of materials science 2016 v.51 no.9 pp. 4379-4389
ISSN:
0022-2461
Subject:
X-radiation; chemical composition; crystal structure; crystallization; crystals; differential scanning calorimetry; hydrogen; infrared spectroscopy; mechanical properties; melting point; nuclear magnetic resonance spectroscopy; piperazine; polymers; temperature; thermal properties; urea; urethane
Abstract:
... A series of segmented polyurethane-urea (PUU) shape memory polymers were synthesized from poly ε-caprolactone (PCL)-diol, hexamethylene diisocyanate, and piperazine (PP) with different hard to soft segment ratios. Chemical structure of PUUs was characterized using hydrogen nuclear magnetic resonance and attenuated total reflective-Fourier transform infrared spectroscopy methods. The results confir ...
DOI:
10.1007/s10853-016-9750-9

53. Quantifying Crystallinity in High Molar Mass Poly(3-hexylthiophene)

Author:
Snyder Chad R.; Nieuwendaal Ryan C.; DeLongchamp Dean M.; Luscombe Christine K.; Sista Prakash; Boyd Shane D.
Source:
Macromolecules 2014 v.47 no.12 pp. 3942-3950
ISSN:
1520-5835
Subject:
annealing; carbon; crystal structure; crystals; differential scanning calorimetry; enthalpy; melting; melting point; molecular weight; nuclear magnetic resonance spectroscopy; photovoltaic cells; stable isotopes
Abstract:
... We demonstrate a method to determine absolute crystallinity in high molar mass poly(3-hexylthiophene) (P3HT), as used in commercially relevant organic photovoltaic devices, using enthalpy of fusion and melting temperature values derived from differential scanning calorimetry (DSC) and ¹³C CPMAS NMR. By studying P3HT with molar masses ranging from 3.6 to 49 kg/mol and using recent work on oligomeri ...
DOI:
10.1021/ma500136d

54. Quercetin Nanosuspensions Produced by High-Pressure Homogenization

Author:
Ayse Karadag; Beraat Ozcelik; Qingrong Huang
Source:
Journal of agricultural and food chemistry 2014 v.62 no.8 pp. 1852-1859
ISSN:
0021-8561
Subject:
antineoplastic activity; atomic force microscopy; bioavailability; crystal structure; crystals; differential scanning calorimetry; free radical scavengers; friction; functional foods; homogenization; maltodextrins; oxygen radical absorbance capacity; particle size; powders; quercetin; scanning electron microscopy; spray drying; water solubility
Abstract:
... High-pressure homogenization (HPH) was used to increase the water solubility of quercetin crystals, which exhibit antioxidant, anti-inflammatory, and anticancer properties but poor water solubility and oral bioavailability. The improved water solubility of quercetin by HPH treatment could be attributed to very fine suspensions produced in the nanometric range (∼400 nm) and loss of crystallinity ...
DOI:
10.1021/jf404065p

55. Role of Ion–Dipole Interactions in Nucleation of Gamma Poly(vinylidene fluoride) in the Presence of Graphene Oxide during Melt Crystallization

Author:
Li Yue; Xu Jia-Zhuang; Zhu Lei; Zhong Gan-Ji; Li Zhong-Ming
Source:
Journal of physical chemistry 2012 v.116 no.51 pp. 14951-14960
ISSN:
1520-5207
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; cetyltrimethylammonium bromide; crystal structure; crystallization; crystals; differential scanning calorimetry; fluorides; glass transition; graphene oxide; melting; surfactants
Abstract:
... The crystallization behavior and crystalline structure of poly(vinylidene fluororide) (PVDF) in the presence of graphene oxide (GO) platelets were investigated using time-resolved Fourier transformation infrared spectroscopy (FTIR), wide-angle X-ray diffraction (WAXD), as well as differential scanning calorimetry (DSC). It is shown that GO platelets induce the formation of γ phase when crystallizi ...
DOI:
10.1021/jp3087607

56. Self-Assembly, Thermotropic, and Lyotropic Phase Behavior of Guerbet Branched-Chain Maltosides

Author:
N. A. Nabila Saari; Azwa Amanina Mislan; Rauzah Hashim; N. Idayu Zahid
Source:
Langmuir 2018 v.34 no.30 pp. 8962-8974
ISSN:
1520-5827
Subject:
alcohols; biomedical research; crystal structure; crystals; differential scanning calorimetry; glass transition; industry; maltose; microscopy; small-angle X-ray scattering; temperature; thermal properties
Abstract:
... Five synthetic β-d-maltosides derived from Guerbet branched alcohols, whose total hydrocarbon chain length ranged from C₈ to C₂₄, were synthesized to a high anomeric purity, and their thermal properties, liquid-crystalline phases, and structures were characterized using differential scanning calorimetry, optical polarizing microscopy, and small-angle X-ray scattering. Thermal investigations of all ...
DOI:
10.1021/acs.langmuir.8b01899

57. Self-decelerated crystallization in poly(butylene terephthalate)/poly(ε-caprolactone) blends

Author:
Di Lorenzo, Maria Laura; Righetti, Maria Cristina
Source:
Journal of polymer science 2007 v.45 no.23 pp. 3148-3155
ISSN:
0887-6266
Subject:
crystal structure; crystallization; crystals; differential scanning calorimetry; melting; microscopy; polymers; temperature
Abstract:
... Isothermal crystallization of poly(butylene terephthalate) (PBT) blended with oligomeric poly(ε-caprolactone) (PCL) is investigated by polarized optical microscopy and differential scanning calorimetry at various temperatures (Tc). The growth rate of PBT spherulites is found to depend on time (t), as the spherulite radius (r) linearly increases with t at the early stages of crystallization (r [is ...
DOI:
10.1002/polb.21313

58. Solid state structural relation and binary melting phase diagram of (S-) and racemic 2-(2-nitro-1-phenylethyl)-1,3-diphenyl-propane-1,3-dione

Author:
Katalin Gönczi; Veronika Kudar; Zsuzsa Jászay; Petra Bombicz; Ferenc Faigl; János Madarász
Source:
Thermochimica acta 2014 v.580 pp. 46-52
ISSN:
0040-6031
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; crystal structure; crystallization; crystals; differential scanning calorimetry; enantiomers; enthalpy; equations; filtrates; melting; melting point; solids; toluene
Abstract:
... Both the S enantiomer and the racemic (RS) forms of 2-(2-nitro-1-phenylethyl)-1,3-diphenyl-propane-1,3-dione (1) have been obtained from the same reaction media by fractional crystallization from toluene. First, the racemic compound, (R,S)-1, was precipitated (mp. 159.7°C), then, from the filtrate, (S)-1 (mp. 135.6°C) was crystallized. The absolute configuration (S) and crystal structure of (S)-1 ...
DOI:
10.1016/j.tca.2014.01.028

59. Structural characterization of complexes prepared with glycerol monoestearate and maize starches with different amylose contents

Author:
M.C. Garcia; M.A. Pereira-da-Silva; S. Taboga; C.M.L. Franco
Source:
Carbohydrate polymers 2016 v.148 pp. 371-379
ISSN:
0144-8617
Subject:
X-ray diffraction; amylose; atomic force microscopy; corn starch; crystal structure; crystals; differential scanning calorimetry; dissociation; emulsifiers; glycerol; scanning electron microscopy; transmission electron microscopy; waxy corn
Abstract:
... Morphology and different structural features of V-amylose complexes prepared with different concentrations (1%, 2%, 3%) of glycerol monostearate (GMS) and normal maize (NMS), waxy maize (WMS), and high amylose maize (HAMS) starches were evaluated using X-ray diffraction, differential scanning calorimetry, scanning electronic microscopy (SEM), atomic force microscopy (AFM), and transmission electro ...
DOI:
10.1016/j.carbpol.2016.04.067

60. Structural, analytical and DSC references to resolution of 2-methoxy-2-phenylacetic acid with chiral 1-cyclohexylethylamines through gas-antisolvent precipitation

Author:
Amit D. Zodge; Petra Bombicz; Edit Székely; György Pokol; János Madarász
Source:
Thermochimica acta 2017 v.648 pp. 23-31
ISSN:
0040-6031
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; acids; chemical interactions; crystal structure; crystallization; crystals; differential scanning calorimetry; hydrophobicity; melting; salts; supercritical fluid extraction; temperature
Abstract:
... The system of intermolecular interactions is very similar in the solid state of the chiral and racemic α-methoxyphenylacetic acids (α-MPAA) indicated by both Differential Scanning Calorimetry (DSC) and FTIR-spectroscopy, and even proved by single crystal structure determination. It makes the resolution of such a racemate compound challenging even by supercritical fluid extraction. The chiral (S)-α ...
DOI:
10.1016/j.tca.2016.11.017

61. Structure, thermal transitions and polymer dynamics in nanocomposites based on poly(ε-caprolactone) and nano-inclusions of 1-3D geometry

Author:
Stefanos Koutsoumpis; Antonios Poulakis; Panagiotis Klonos; Sotiria Kripotou; Vasilios Tsanaktsis; Dimitrios N. Bikiaris; Apostolos Kyritsis; Polycarpos Pissis
Source:
Thermochimica acta 2018 v.666 pp. 229-240
ISSN:
0040-6031
Subject:
carbon nanotubes; crystal structure; crystallization; crystals; differential scanning calorimetry; geometry; glass transition; glass transition temperature; graphene oxide; models; molecular dynamics; nanoparticles; nanosheets; nanosilver; polymer nanocomposites; polymers; scanning electron microscopy; silica; silver; spectroscopy; surface area; wide-angle X-ray scattering
Abstract:
... Polymer nanocomposites, PNCs, based on poly(ε-caprolactone) (PCL) and four fillers differing in shape, namely spherical silica and Ag nanoparticles (3D, referring to the number of nanoscopic dimensions), multi-wall carbon nanotubes, CNTs, (2D), and graphene oxide, GO, nanosheets (1D), were prepared and investigated at low contents of 0.5–2.5 wt%. Scanning electron microscopy, SEM, and wide angle X ...
DOI:
10.1016/j.tca.2018.05.012

62. Study on Crystallization Kinetics of Partially Melting Polyethylene Aiming To Improve Mechanical Properties

Author:
Zheng Haili; Wang Bo; Zheng Guoqiang; Wang Zhigang; Dai Kun; Liu Chuntai; Shen Changyu
Source:
Industrial & Engineering Chemistry Research 2014 v.53 no.14 pp. 6211-6220
ISSN:
1520-5045
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; crystal structure; crystallization; crystals; differential scanning calorimetry; engineering; extrusion; melting; polyethylene; tensile strength
Abstract:
... Partially melting high-density polyethylene (HDPE) is investigated by differential scanning calorimetry and in situ Fourier transform infrared spectroscopy (FTIR) measurements. The results show that some incompletely molten crystals can be preserved in the partially melting HDPE, thus accelerating subsequent crystallization. Moreover, quantitative calculation of such incompletely molten crystals h ...
DOI:
10.1021/ie500007n

63. Study on grainy crystals in edible beef tallow shortening

Author:
Jin, Q.; Gao, H.; Shan, L.; Liu, Y.; Wang, X.
Source:
Food research international 2007 v.40 no.7 pp. 909-914
ISSN:
0963-9969
Subject:
beef; tallow; shortenings; crystal structure; crystals; crystallization; free fatty acids; fatty acid composition; thermal properties; triacylglycerols; melting point; glycerol; differential scanning calorimetry; X-ray diffraction
Abstract:
... The slip melting points (SMP), thermal characteristics, structural properties, fatty acid compositions and triacylglycerol (TAG) compositions of the grainy crystals and surrounding materials in the edible beef tallow shortening (EBTS) were studied. The results showed that the TAG compositions of the grainy crystals changed greatly compared with their surrounding materials. The contents of low melt ...
DOI:
10.1016/j.foodres.2007.03.006

64. Super-tough hydrogels from shape-memory polyurethane with wide-adjustable mechanical properties

Author:
Feng Wu; Lei Chen; Yangling Li; Ka I Lee; Bin Fei
Source:
Journal of materials science 2017 v.52 no.8 pp. 4421-4434
ISSN:
0022-2461
Subject:
Fourier transform infrared spectroscopy; biodegradability; crystal structure; crystals; differential scanning calorimetry; energy; heat; hydrogels; hydrogen bonding; hydrophilicity; hydrophobicity; polyethylene glycol; polyurethanes; tensile strength; thermoplastics; water content
Abstract:
... Recoverable hydrogels with high strength and toughness have been fabricated from hydrophilic and thermoplastic polyurethane (HTPU), which chains consist of hydrophilic polyethylene glycol (PEG) segment of high crystallinity and hydrophobic segment with strong hydrogen-bonding groups. This HTPU absorbed high amount of water, during which the PEG crystals swollen and dissolved, while the hydrophobic ...
DOI:
10.1007/s10853-016-0689-7

65. Surface crystallization of low thermal expansion Ba₀.₅Sr₀.₅Zn₂Si₂O₇ from an 8 BaO·8 SrO·34 ZnO·50 SiO₂ glass

Author:
Michael Kracker; Liliya Vladislavova; Christian Thieme; Tilman Zscheckel; Katrin Thieme; Thomas Höche; Christian Rüssel
Source:
RSC advances 2017 v.7 no.71 pp. 44834-44842
ISSN:
2046-2069
Subject:
X-ray diffraction; crystal structure; crystallization; crystals; cutting; differential scanning calorimetry; glass; heat treatment; light microscopy; scanning electron microscopy; silica; thermal expansion; zinc oxide
Abstract:
... Thermal treatment of a glass with the composition 8 BaO·8 SrO·34 ZnO·50 SiO₂ has led to the crystallization of a Ba₁₋ₓSrₓZn₂Si₂O₇ solid solution. This solid solution has a very low or even negative thermal expansion. The glass system possesses a strong tendency towards surface crystallization, while bulk nucleation is negligible. The surface crystallization behavior was characterized using differe ...
DOI:
10.1039/c7ra08587g

66. Syntheses, single-crystal structures, vibrational spectra and DSC/TG analyses of orthorhombic and trigonal Ag[N(CN)₂]

Author:
Olaf Reckeweg; Armin Schulz; Christof Schneck; Falk Lissner; Thomas Schleid
Source:
Zeitschrift für Naturforschung 2016 v.71 no.7 pp. 827-834
ISSN:
1865-7117
Subject:
ambient temperature; ammonia; aqueous solutions; blood platelets; crystals; differential scanning calorimetry; evaporation; mixing; nitrates; powders; silver; sodium; solvents; thermogravimetry
Abstract:
... Colorless powders of orthorhombic Ag[N(CN)₂] were synthesized by blending aqueous solutions Ag[NO₃] with stoichiometric amounts of Na[N(CN)₂] equally dissolved in water. Single crystals of both modifications of Ag[N(CN)₂] could be obtained by recrystallizing the powder with aqueous ammonia. Non-isothermal evaporation of the solvent at room temperature within a few hours yielded the orthorhombic mo ...
DOI:
10.1515/znb-2016-0045

67. Synthesis and Crystallization Behavior of Equisequential ADMET Polyethylene Containing Arylene Ether Defects: Remarkable Effects of Substitution Position and Arylene Size

Author:
Song Shao-Fei; Guo Yin-Tian; Wang Rui-Yang; Fu Zhi-Sheng; Xu Jun-Ting; Fan Zhi-Qiang
Source:
Macromolecules 2016 v.49 no.16 pp. 6001-6011
ISSN:
1520-5835
Subject:
crystal structure; crystallization; crystals; differential scanning calorimetry; melting point; polyethylene; polyethylene glycol; polymerization; thermal stability; thermogravimetry
Abstract:
... A new series of polyethylene (PE) containing arylene ether units as defects in the main chain, which were precisely separated by 20 CH₂ units, were synthesized via acyclic diene metathesis (ADMET) polymerization. The thermal stability, crystallization, and melting behaviors, crystal structure, and chain stacking were investigated with TGA, DSC, WAXD, and SAXS. It is found that the substitution pos ...
DOI:
10.1021/acs.macromol.6b01324

68. Synthesis and crystallization behavior of rigid copolyesters with biphenyl‐4,4′‐dicarboxylate and 2,6‐naphthalenedicarboxylate in the main chain

Author:
Hans Eliot Edling; Matthew Vincent; Hervé Marand; Samantha J. Talley; Kevin Barr; Robert B. Moore; S. Richard Turner
Source:
Journal of polymer science 2019 v.57 no.15 pp. 973-980
ISSN:
0887-6266
Subject:
X-ray diffraction; crystal structure; crystallization; crystals; differential scanning calorimetry; endothermy; esters; heat; melting; polyesters; thermoplastics; transesterification; wide-angle X-ray scattering
Abstract:
... Structurally rigid copolyester thermoplastics were synthesized from 1,4‐cyclohexanedimethanol and the diesters dimethyl biphenyl‐4,4′‐dicarboxylate and dimethyl 2,6‐naphthalenedicarboxylate (DMN) via conventional melt transesterification. Conventional differential scanning calorimetry (CDSC) showed all compositions to exhibit multiple endotherms upon heating. Wide‐angle X‐ray diffraction analysis ...
DOI:
10.1002/polb.24852

69. Synthesis, characterization and corrosion inhibition potential of two novel Schiff bases on mild steel in acidic medium

Author:
Archana Pandey; B. Singh; Chandrabhan Verma; Eno E. Ebenso
Source:
RSC advances 2017 v.7 no.74 pp. 47148-47163
ISSN:
2046-2069
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; corrosion; crystal structure; crystals; dielectric spectroscopy; differential scanning calorimetry; electrochemistry; electron transfer; hardness; hydrochloric acid; nitrophenols; nuclear magnetic resonance spectroscopy; schiff bases; spectral analysis; steel; thermography; ultraviolet-visible spectroscopy
Abstract:
... The present study deals with the synthesis of two novel Schiff bases (SBs) namely; 5-((4-chloro-3-nitrophenylimino)methyl)-2-methoxyphenol (SB-1) and 2-(4-hydroxy-3-methoxybenzylidineamino)-4-nitrophenol (SB-2) using a solid–liquid phase equilibrium diagram and their characterization via¹H and ¹³C NMR, FT-IR and UV-vis spectral analyses. Differential scanning calorimetric (DSC) thermographs were a ...
DOI:
10.1039/c7ra08887f

70. Synthesis, crystal structure and properties of Cd(NCS)₂ coordination compounds with two different Cd coordination modes

Author:
Aleksej Jochim; Gianpiero Gallo; Robert Dinnebier; Christian Näther
Source:
Zeitschrift für Naturforschung 2019 v.74 no.1 pp. 49-58
ISSN:
1865-7117
Subject:
anions; cadmium; cations; crystal structure; crystallization; crystals; differential scanning calorimetry; ligands; manganese; thermogravimetry; thiocyanates
Abstract:
... Reaction of Cd(NCS)₂ with 4-methoxypyridine leads to the formation of four new compounds, of which one crystallizes in two different polymorphs. In Cd(NCS)₂(4-methoxypyridine)₄·(4-methoxypyridine)₂ (1) and Cd(NCS)₂(4-methoxypyridine)₄ (2-I and 2-II) discrete complexes are found, in which the Cd cations are octahedrally coordinated by four 4-methoxypyridine co-ligands and two terminally N-bonded th ...
DOI:
10.1515/znb-2018-0169

71. Tailored Structure and Properties of Injection-Molded Atactic Polypropylene/Isotactic Polypropylene Blend

Author:
Zhang Zhengchi; Lei Jun; Chen Yanhui; Chen Jun; Ji Xu; Tang Jianhua; Li Zhong-Ming
Source:
ACS sustainable chemistry 2013 v.1 no.8 pp. 937-949
ISSN:
2168-0485
Subject:
X-radiation; X-ray diffraction; crystal structure; crystals; differential scanning calorimetry; injection molding; polypropylenes; scanning electron microscopy; tensile strength
Abstract:
... In the present work, atactic polypropylene (aPP)/isotactic polypropylene (iPP) with different aPP content was prepared through an injection-molding process to improve the toughness of iPP and make large scale use of aPP. The hierarchic structure of the injection-molded parts was characterized through differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), small-angle X-ray sc ...
DOI:
10.1021/sc400140y

72. Three dimensional macroporous hydroxyapatite/chitosan foam-supported polymer micelles for enhanced oral delivery of poorly soluble drugs

Author:
Yanzhuo Zhang; Kai Dong; Fang Wang; Hongtao Wang; Jing Wang; Ziqiu Jiang; Shuai Diao
Source:
Colloids and surfaces 2018 v.170 pp. 497-504
ISSN:
0927-7765
Subject:
angle of repose; bioavailability; chitosan; colloids; coprecipitation; crystal structure; crystals; differential scanning calorimetry; drug delivery systems; drugs; foams; freeze drying; hydroxyapatite; laboratory animals; macropores; micelles; polymethylmethacrylate; porous media; rats; solubility
Abstract:
... In the current study, a novel three-dimensional macroporous hydroxyapatite/ chitosan foam (HA/CS)-supported polymer micelle (PM/HA/CS) was developed, and its potential as an oral drug delivery system to enhance the solubility and oral bioavailability of poorly soluble compounds was systemically studied. Candesartan cilexetil (CC) was selected as a poorly soluble model drug. Firstly, HA/CS foam was ...
DOI:
10.1016/j.colsurfb.2018.06.053

73. Variation in kinetics of martensitic transformation during partial thermal cycling of the TiNi alloy

Author:
Sergey Belyaev; Natalia Resnina; Alexey Sibirev; Ivan Lomakin
Source:
Thermochimica acta 2014 v.582 pp. 46-52
ISSN:
0040-6031
Subject:
alloys; crystal structure; crystals; differential scanning calorimetry; temperature
Abstract:
... A method of differential scanning calorimetry has been used for the study of variation in the kinetics of thermal elastic martensitic transformation during the thermal cycling of the equiatomic TiNi alloy through the different fractions of forward or reverse martensitic transformation temperature ranges. The results of the study have shown that “partial cooling” cycling results in damage to the cr ...
DOI:
10.1016/j.tca.2014.03.002

74. The ascorbyl palmitate–polyethyleneglycol 400–water system phase behavior

Author:
Luciano Benedini; Paula V. Messina; Santiago D. Palma; Daniel A. Allemandi; Pablo C. Schulz
Source:
Colloids and surfaces 2012 v.89 no. pp. 265-270
ISSN:
0927-7765
Subject:
colloids; crystal structure; crystals; differential scanning calorimetry; heat; melting; microscopy; polyethylene glycol; surfactants; temperature
Abstract:
... Ascorbyl palmitate (Asc16) in polyethyleneglycol 400 (PEG 400)–water mixtures at weight fractions (w/w) between 0.05 and 1.0 were studied by differential scanning calorimetry (DSC) and polarizing microscopy (PM) at different temperatures. The employed PEG 400–water proportions were: 0–25–50% and 75% of polymer. A complete phase diagram was determined for each PEG 400–water mixture. A cubic mesopha ...
DOI:
10.1016/j.colsurfb.2011.09.030

75. A comparative study of degradation mechanisms of PHBV and PBSA under laboratory-scale composting conditions

Author:
Mélanie Salomez; Matthieu George; Pascale Fabre; François Touchaleaume; Guy Cesar; Anaïs Lajarrige; Emmanuelle Gastaldi
Source:
Polymer degradation and stability 2019 v.167 pp. 102-113
ISSN:
0141-3910
Subject:
Fourier transform infrared spectroscopy; atomic force microscopy; biodegradability; biodegradation; comparative study; composting; crystal structure; crystals; differential scanning calorimetry; melting point; mineralization; molecular weight; plastics; pollution; scanning electron microscopy; thermal properties
Abstract:
... Biodegradable plastics appear as one promising means to help solving the increasing issue of environmental pollution by plastics. The present study aims at comparing the biodegradation mechanisms of two promising biodegradable plastics, PHBV Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and PBSA Poly(butylene succinate-co-adipate) with the objective to provide a better understanding of the mechanis ...
DOI:
10.1016/j.polymdegradstab.2019.06.025

76. The cooling rate effect on the microstructure and rheological properties of blends of cocoa butter with vegetable oils

Author:
Perez-Martinez, D.; Alvarez-Salas, C.; Charo-Alonso, M.; Dibildox-Alvarado, E.; Toro-Vazquez, J.F.
Source:
Food research international 2007 v.40 no.1 pp. 47-62
ISSN:
0963-9969
Subject:
cocoa butter; microstructure; lipid content; viscoelasticity; dispersions; soybean oil; solids; supercooling; crystal structure; canola oil; crystals; triacylglycerols; glass transition temperature; differential scanning calorimetry; crystallization; blended foods
Abstract:
... The elasticity (G') and yield stress (σ*) of blends of cocoa butter (CB) in vegetable oils (i.e., 30% CB/canola and 30% CB/soybean oil) crystallized at temperatures (TCr) between 9.5 °C and 13.5 °C and two cooling rates (1 °C/min and 5 °C/min) were determined, evaluating their relationship with parameters associated with the formation and structural organization of the crystal network [i.e., solid ...
DOI:
10.1016/j.foodres.2006.07.016

77. The effect of cellulose nanofibers on the crystallinity and nanostructure of poly(lactic acid) composites

Author:
Adriana Nicoleta Frone; Denis Mihaela Panaitescu; Ioana Chiulan; Cristian Andi Nicolae; Zina Vuluga; Catalin Vitelaru; Celina Maria Damian
Source:
Journal of materials science 2016 v.51 no.21 pp. 9771-9791
ISSN:
0022-2461
Subject:
X-ray diffraction; annealing; atomic force microscopy; biodegradability; cellulose; crystal structure; crystallization; crystals; differential scanning calorimetry; food packaging; hardness; heat tolerance; melting; nanofibers; polylactic acid; scanning electron microscopy; strength (mechanics)
Abstract:
... Poly(lactic acid) (PLA) is a semi-crystalline polymer with good transparency, mechanical strength, and melt processability. However, the use of PLA in applications like food packaging is limited by its low heat resistance and slow crystallization rate. The addition of cellulose nanofibers can be an efficient solution to enhance PLA crystallinity and stiffness, maintaining the transparency and biod ...
DOI:
10.1007/s10853-016-0212-1

78. The extent of maize starch crystal melting as a critical factor in the isolation of amylose via aqueous leaching

Author:
Andrés F. Doblado-Maldonado; Sara V. Gomand; Bart Goderis; Jan A. Delcour
Source:
Food hydrocolloids 2016 v.61 pp. 36-47
ISSN:
0268-005X
Subject:
amylopectin; amylose; annealing; corn starch; crystal structure; crystals; differential scanning calorimetry; enthalpy; hydrocolloids; leachates; leaching; melting; polymerization; temperature
Abstract:
... Aqueous leaching from granular maize starch is a common technique for amylose (AM) isolation. Leaching was studied in a 60–90 °C temperature range. The leachate yield, degree of polymerization (DP) and purity were related to the extent of melting of the starch crystals at the leaching temperature as determined via differential scanning calorimetry. Annealing increases the amylopectin (AP) crystal ...
DOI:
10.1016/j.foodhyd.2016.04.044

79. The impact of N,N-dimethyldodecylamine N-oxide (DDAO) concentration on the crystallisation of sodium dodecyl sulfate (SDS) systems and the resulting changes to crystal structure, shape and the kinetics of crystal growth

Author:
Emily Summerton; Martin J. Hollamby; Georgina Zimbitas; Tim Snow; Andrew J. Smith; Jens Sommertune; Jeanluc Bettiol; Christopher Jones; Melanie M. Britton; Serafim Bakalis
Source:
Journal of colloid and interface science 2018 v.527 pp. 260-266
ISSN:
0021-9797
Subject:
anionic surfactants; crystal structure; crystallization; crystals; detergents; differential scanning calorimetry; nonionic surfactants; sodium dodecyl sulfate; temperature; wide-angle X-ray scattering
Abstract:
... At low temperatures stability issues arise in commercial detergent products when surfactant crystallisation occurs, a process which is not currently well-understood. An understanding of the phase transition can be obtained using a simple binary SDS (sodium dodecyl sulfate) + DDAO (N,N-dimethyldodecylamine N-oxide) aqueous system. It expected that the crystallisation temperature of an SDS system ca ...
DOI:
10.1016/j.jcis.2018.05.058

80. The influence of epitaxial crystallization on the mechanical properties of a high density polyethylene/reduced graphene oxide nanocomposite injection bar

Author:
Guibin Yao; Tianchen Duan; Minfang An; Haojun Xu; Feng Tian; Zongbao Wang
Source:
RSC advances 2017 v.7 no.35 pp. 21918-21925
ISSN:
2046-2069
Subject:
X-ray diffraction; crystal structure; crystallization; crystals; differential scanning calorimetry; graphene oxide; injection molding; mechanical properties; nanocomposites; polyethylene; small-angle X-ray scattering; wide-angle X-ray scattering
Abstract:
... High density polyethylene (HDPE)/reduced graphene oxide (RGO) nanocomposite bars were prepared by injection molding and the effects of RGO on the HDPE matrix were investigated. Differential scanning calorimetry results demonstrated that RGO was an effective nucleation agent for HDPE. Two dimensional wide angle X-ray diffraction (2D WAXD) results showed that the incorporation of RGO enhanced the de ...
DOI:
10.1039/c7ra02742g

81. An unexpected lanthanum chloride carbonate hydrate: synthesis, crystal structure, vibrational spectra and thermal degradation of LaCl[CO₃]·3H₂O

Author:
Olaf Reckeweg; Falk Lissner; Björn Blaschkowski; Armin Schulz; Thomas Schleid
Source:
Zeitschrift für Naturforschung 2018 v.73 no.9 pp. 661-667
ISSN:
1865-7117
Subject:
Raman spectroscopy; X-ray diffraction; anions; aqueous solutions; carbon dioxide; carbonates; chlorides; crystal structure; crystals; differential scanning calorimetry; heat treatment; lanthanum; oxygen; powders; sodium; temperature; thermal degradation; thermogravimetry
Abstract:
... Microcrystalline powders of LaCl[CO₃]·3H₂O were precipitated and isolated from stoichiometric aqueous solutions of LaCl₃·7H₂O and Na₂[CO₃]·10H₂O. This confirmed the surprising emergence of corresponding single crystals during a reaction of equimolar aqueous solutions of LaCl₃·7H₂O and Na[N₃] under ambient conditions by the uptake of atmospheric CO₂. According to the X-ray structure analysis of col ...
DOI:
10.1515/znb-2018-0111