PubAg

Main content area

You searched for: Subject "siloxanes" Remove constraint Subject: "siloxanes"
Start Over

Search

545  Search Results

« Previous | 1 - 20 of 545 |
Number of results to display per page

Search Results

1. Bent-core dimers with top-to-bottom linkage between central units

Author:
Horčic, Martin; Svoboda, Jiří; Novotná, Vladimíra; Pociecha, Damian; Gorecka, Ewa
Source:
RSC advances 2018 v.8 no.41 pp. 22974-22985
ISSN:
2046-2069
Subject:
siloxanes,   etc   ; linkage groups; organofluorine compounds;     Show all 3 Subjects
Abstract:
... A structurally new type of core-to-core dimer with a top-to-bottom linkage between the central cores of bent molecules is presented. The structure of the bent-core molecules was modified by changing the length of the spacer between the central cores and terminal chains, by changing the type of linkage groups in the bent-core arms and by variation of the terminal chain polarity – introducing polyfl ...
DOI:
10.1039/c8ra04108c

2. High Fluorescence Quantum Yield Based on the Through-Space Conjugation of Hyperbranched Polysiloxane

Author:
Feng, Yuanbo; Bai, Tian; Yan, Hongxia; Ding, Fan; Bai, Lihua; Feng, Weixu
Source:
Macromolecules 2019 v.52 no.8 pp. 3075-3082
ISSN:
1520-5835
Subject:
siloxanes,   etc   ; fluorescence; iron; moieties; pH; solvents; synergism; transmission electron microscopy;     Show all 8 Subjects
Abstract:
... Unorthodox luminogenic polymers without aromatic luminogens have attracted great interest in recent years; however, the low fluorescence efficiency is still a big drawback. In this paper, we synthesized a fluorescent hyperbranched polysiloxane with both carbonyl and vinyl groups (P1). Surprisingly, it exhibited nontraditional intrinsic luminescence with the highest quantum yield up to 43.9% among ...
DOI:
10.1021/acs.macromol.9b00263

3. Study of dependence of elasticity on the microstructure of microcapsules using electro-deformation technique

Author:
Puri, Sneha; Thaokar, Rochish M.
Source:
Colloids and surfaces 2019
ISSN:
0927-7757
Subject:
siloxanes,   etc   ; microstructure; models; modulus of elasticity; oils; strength (mechanics);     Show all 6 Subjects
Abstract:
... Polysiloxane microcapsules have emerged as a model system to understand capsule formation and mechanical properties, owing to the simplicity of formation. In this work, we demonstrate that the residual water in the oil phase, that also contains the precursor Octadecyl trichlorosilane (OTS), significantly affects the mechanism of formation of bigger and smaller capsules. While in larger capsules, a ...
DOI:
10.1016/j.colsurfa.2019.02.048

4. Fluorotelomer alcohols (FTOHs), brominated flame retardants (BFRs), organophosphorus flame retardants (OPFRs) and cyclic volatile methylsiloxanes (cVMSs) in indoor air from occupational and home environments

Author:
Sha, Bo; Dahlberg, Anna-Karin; Wiberg, Karin; Ahrens, Lutz
Source:
Environmental pollution 2018 v.241 pp. 319-330
ISSN:
0269-7491
Subject:
siloxanes,   etc   ; air; alcohols; breathing; flame retardants;     Show all 5 Subjects
Abstract:
... Indoor air samples were collected from private homes and various occupational indoor environments using passive air sampler and analysed for fluorotelomer alcohols (FTOHs), brominated flame retardants (BFRs), organophosphorus flame retardants (OPFRs) and cyclic volatile methyl siloxanes (cVMSs). The aim was to investigate their occurrence in indoor air, factors that may affect their presence and h ...
DOI:
10.1016/j.envpol.2018.04.032

5. Preparation and mechanism of shape memory bismaleimide resins with high transition temperature, high toughness and good processability

Author:
Chen, Banghui; Yuan, Li; Guan, Qingbao; Liang, Guozheng; Gu, Aijuan
Source:
Journal of materials science 2018 v.53 no.15 pp. 10798-10811
ISSN:
0022-2461
Subject:
siloxanes,   etc   ; heat tolerance; impact strength; resins; temperature;     Show all 5 Subjects
Abstract:
... Developing shape memory polymers (SMPs) with high transition temperature (Tₜᵣₐₙₛ), good toughness and good processability (low molding temperature and solvent-free) is still a great challenge. Herein, a new type of thermosetting shape memory resin (BDPH) is developed based on bismaleimide resin (BD), cardo-polyetherketone (PEK-C) and multi-maleimide-terminated branched polysiloxane (HSi). The effe ...
DOI:
10.1007/s10853-018-2367-4

6. Aerobic Co or Cu/NHPI-catalyzed oxidation of hydride siloxanes: synthesis of siloxanols

Author:
Arzumanyan, Ashot V.; Goncharova, Irina K.; Novikov, Roman A.; Milenin, Sergey A.; Boldyrev, Konstantin L.; Solyev, Pavel N.; Tkachev, Yaroslav V.; Volodin, Alexander D.; Smol'yakov, Alexander F.; Korlyukov, Alexander A.; Muzafarov, Aziz M.
Source:
Green chemistry 2018 v.20 no.7 pp. 1467-1471
ISSN:
1463-9270
Subject:
siloxanes,   etc   ; cobalt; copper; green chemistry; hydrides; oxidation;     Show all 6 Subjects
Abstract:
... A highly efficient preparative method for the synthesis of siloxanols based on aerobic Co(OAc)₂ or Cu(OAc)₂/NHPI-catalyzed oxidation of hydride siloxanes using “green”, commercially available, simple inexpensive reagents and mild reaction conditions has been proposed. This is a general reaction for the synthesis of mono-, oligo- and polymeric siloxanols with various structures (linear, branched an ...
DOI:
10.1039/c8gc00424b

7. Highly transparent superamphiphobic surfaces by elaborate microstructure regulation

Author:
Zhang, Junping; Yu, Bo; Wei, Qingyun; Li, Bucheng; Li, Lingxiao; Yang, Yanfei
Source:
Journal of colloid and interface science 2019 v.554 pp. 250-259
ISSN:
0021-9797
Subject:
siloxanes,   etc   ; adhesion; air; carbon nanotubes; coatings; microscopes; microstructure; silica; solvents; surface tension; vapors; wettability;     Show all 12 Subjects
Abstract:
... Superamphiphobic surfaces have attracted extensive attention from both academic and commercial communities because of their unique wettability. However, big challenge still remains as superamphiphobic surfaces frequently suffer the drawbacks of either easy adhesion of liquids with low surface tension (<27.5 mN m−1) or low transparency, which in turn seriously hinders their applications. Here, we r ...
DOI:
10.1016/j.jcis.2019.06.106

8. Volatile methylsiloxanes in sewage treatment plants in Saitama, Japan: Mass distribution and emissions

Author:
Horii, Yuichi; Nojiri, Kiyoshi; Minomo, Kotaro; Motegi, Mamoru; Kannan, Kurunthachalam
Source:
Chemosphere 2019 v.233 pp. 677-686
ISSN:
0045-6535
Subject:
siloxanes,   etc   ; activated carbon; activated sludge; aeration; emissions; flue gas; landfills; liquids; sewage treatment; volatilization; wastewater; Japan;     Show all 12 Subjects
Abstract:
... Wastewater, aeration gas, dewatered sludge, and incineration ash and flue gas (from dewatered sludge) were collected from 9 sewage treatment plants (STPs) located in Saitama Prefecture, Japan, and analyzed for seven cyclic and linear volatile methylsiloxanes (VMSs) namely, D3, D4, D5, D6, L3, L4, and L5. The mass loadings and distribution of VMSs in STPs were estimated based on measured concentrat ...
DOI:
10.1016/j.chemosphere.2019.05.247

9. Amphiphilic triptycene-based stationary phase for high-resolution gas chromatographic separations

Author:
Yu, Lining; He, Jun; Qi, Meiling; Huang, Xuebin
Source:
Journal of chromatography 2019 v.1599 pp. 239-246
ISSN:
0021-9673
Subject:
siloxanes,   etc   ; chemical species; gas chromatography; ionic liquids; isomers; phenols; polyethylene glycol; standard deviation; thermal stability;     Show all 9 Subjects
Abstract:
... This work reports a new type of triptycene-based amphiphilic stationary phase (TP-2IL) for gas chromatography (GC). It is an integration of the 3D π-rich triptycene framework with ionic liquids. Its capillary column showed the efficiency of 3880 plates/m determined by n-dodecane at 120 °C (k = 2.79) and exhibited good performance for analytes from apolar to polar nature. Particularly, it has outst ...
DOI:
10.1016/j.chroma.2019.04.033

10. Chromium-based MIL-101 metal organic framework as a fully regenerable D4 adsorbent for biogas purification

Author:
Gargiulo, Nicola; Peluso, Antonio; Aprea, Paolo; Marino, Ottavio; Cioffi, Raffaele; Jannelli, Elio; Cimino, Stefano; Lisi, Luciana; Caputo, Domenico
Source:
Renewable energy 2019 v.138 pp. 230-235
ISSN:
0960-1481
Subject:
siloxanes,   etc   ; adsorbents; adsorption; anaerobic digestion; biogas; coordination polymers; hydrogen sulfide; poisoning; sorption isotherms; temperature; waste treatment;     Show all 11 Subjects
Abstract:
... In this work, the chromium-based MIL-101 metal organic framework has been synthesized and investigated as a fully regenerable, high capacity sorbent for siloxanes, which are common contaminants in raw biogas from anaerobic digestion. Adsorption isotherms of D4, the most common siloxane in waste treatment plants, have been collected at different temperatures and modelled by means of the Langmuir th ...
DOI:
10.1016/j.renene.2019.01.096

11. Long-range transport potential and atmospheric persistence of cyclic volatile methylsiloxanes based on global measurements

Author:
Xu, Shihe; Warner, Nicholas; Bohlin-Nizzetto, Pernilla; Durham, Jeremy; McNett, Debra
Source:
Chemosphere 2019 v.228 pp. 460-468
ISSN:
0045-6535
Subject:
siloxanes,   etc   ; air; atmospheric chemistry; data collection; models; persistent organic pollutants; volatile compounds;     Show all 7 Subjects
Abstract:
... This study investigates persistence (P) and long-range transport potential (LRTP) of cyclic volatile methylsiloxanes (cVMS) based on the field measurements in the Northern Hemisphere. The field data consisted of published outdoor air concentrations of octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5) and dodecamethylcyclohexasiloxane (D6) at urban, suburban, rural and remote loc ...
DOI:
10.1016/j.chemosphere.2019.04.130

12. Precise regulation of the selectivity of supported nano-Pd catalysts using polysiloxane coatings with tunable surface wettability

Author:
WangThese authors contributed equally., Hongli; Gao, Ziqian; Wang, Xinzhi; Wei, Ruiping; Zhang, Junping; Shi, Feng
Source:
Chemical communications 2019 v.55 no.57 pp. 8305-8308
ISSN:
1364-548X
Subject:
siloxanes,   etc   ; amination; catalysts; catalytic activity; coatings; ethylbenzene; hydrogenation; hydrophilicity; hydrophobicity; imines; palladium; styrene; titanium dioxide; wettability;     Show all 14 Subjects
Abstract:
... A facile method was developed for surface modification of supported nano-Pd catalysts with tailorable wettability. The obtained Pd/TiO₂@POS catalytic materials could be used in the controllable synthesis of styrene and ethylbenzene obtained from hydrogenation of phenylacetylene and the selective synthesis of imine and N-methylanilines via a reductive amination reaction. The precise modification of ...
DOI:
10.1039/c9cc03800k

13. Performance and selectivity of lower-rim substituted calix[4]arene as a stationary phase for capillary gas chromatography

Author:
Sun, Tao; Li, Bin; Shuai, Xiaomin; Chen, Yujie; Li, WeiWei; Cai, Zhiqiang; Qiao, Xiaoguang; Hu, Shaoqiang; Ma, Lufang
Source:
RSC advances 2019 v.9 no.37 pp. 21207-21214
ISSN:
2046-2069
Subject:
siloxanes,   etc   ; alcohols; aldehydes; alkanes; aromatic hydrocarbons; capillary gas chromatography; cis-trans isomers; esters; ketones;     Show all 9 Subjects
Abstract:
... This work presents the investigation of p-tert-butyl(tetradecyloxy)calix[4]arene (C4A-C10) as stationary phase for capillary gas chromatographic (GC) separations. The statically-coated C4A-C10 capillary column showed weak polarity and column efficiency of 2566 plates per m determined by n-dodecane at 120 °C. Impressively, the C4A-C10 column exhibited extremely high resolving capability for a wide ...
DOI:
10.1039/c9ra03004b

14. Multimodal microscopy-based identification of surface nanobubbles

Author:
Hain, Nicole; Handschuh-Wang, Stephan; Wesner, Daniel; Druzhinin, Sergey I.; Schönherr, Holger
Source:
Journal of colloid and interface science 2019 v.547 pp. 162-170
ISSN:
0021-9797
Subject:
siloxanes,   etc   ; air; atomic force microscopy; droplets; fluorescence; fluorescence microscopy; fluorescent dyes; glass; nanobubbles; oils; rhodamines;     Show all 11 Subjects
Abstract:
... Surface nanobubbles, which were controversially discussed in the literature, promise a number of outstanding applications, and their presence may hamper nanoscale processes at solid-aqueous interfaces. A most crucial and yet unsolved question is the rapid and conclusive identification of gas-filled (surface) nanobubbles. We hypothesize that surface nanobubbles and oil nanodroplets can be conclusiv ...
DOI:
10.1016/j.jcis.2019.03.084

15. Assessment of volatile methylsiloxanes in environmental matrices and human plasma

Author:
Guo, Junyu; Zhou, Ying; Cui, Jia'nan; Zhang, Boya; Zhang, Jianbo
Source:
The Science of the total environment 2019 v.668 pp. 1175-1182
ISSN:
0048-9697
Subject:
siloxanes,   etc   ; additives; air pollution; breathing; dust; gases; humans; ingestion; particulates; residential areas; China;     Show all 11 Subjects
Abstract:
... Volatile methylsiloxanes (VMSs) are widely used in various personal-care products and industrial additives and products. This study focused on VMSs exposure in the general population, workers, and the families of workers living in residential and industrial areas of southwestern China. VMSs concentrations in indoor environmental matrices from six industrial facilities were 3.4 × 102 to 9.0 × 102 μ ...
DOI:
10.1016/j.scitotenv.2019.03.092

16. Thermodynamic Properties of Dodecamethylpentasiloxane, Tetradecamethylhexasiloxane, and Decamethylcyclopentasiloxane

Author:
Thol, Monika; Javed, Muhammad Ali; Baumhögger, Elmar; Span, Roland; Vrabec, Jadran
Source:
Industrial & engineering chemistry process design and development 2019 v.58 no.22 pp. 9617-9635
ISSN:
1520-5045
Subject:
siloxanes,   etc   ; chemical industry; energy; enthalpy; entropy; equations; liquids; models; power plants; process design; temperature;     Show all 11 Subjects
Abstract:
... Siloxanes are widely used in the chemical industry and in process and power engineering. For example, they are used as working fluids of organic Rankine cycle power plants since 20 years ago. For the process design and optimization, thermodynamic properties, such as enthalpy, entropy, speed of sound, density, and vapor–liquid equilibrium, are required. While the properties of short-chained siloxan ...
DOI:
10.1021/acs.iecr.9b00608

17. Developing Eco-friendly High-Strength Soy Adhesives with Improved Ductility through Multiphase Core–Shell Hyperbranched Polysiloxane

Author:
Wang, Zhong; Zhao, Shujun; Pang, Huiwen; Zhang, Wei; Zhang, Shifeng; Li, Jianzhang
Source:
ACS sustainable chemistry & engineering 2019 v.7 no.8 pp. 7784-7794
ISSN:
2168-0485
Subject:
siloxanes,   etc   ; adhesives; biomass; cross-linking reagents; manufacturing; mechanical stress; plywood; resins; soy protein; tannins;     Show all 10 Subjects
Abstract:
... Development of nonformaldehyde biobased adhesives composed of renewable and low-cost biomass protein with high strength and ductility is desired to meet green and sustainable requirements for wood-based composites. Herein, a hyperbranched polysiloxane-terminated cardanol side group was incorporated for the first time with tannic acid in this effort, forming a fully biobased core–shell hybrid (TCA- ...
DOI:
10.1021/acssuschemeng.8b06810

18. Impact of silica deposition on the performance of gas-fired domestic appliances caused by the combustion of siloxanes in the fuel

Author:
Gersen, Sander; Visser, Pieter; van Essen, Martijn; Brown, Martin; Lewis, Andy; Levinsky, Howard
Source:
Renewable energy 2019 v.132 pp. 575-586
ISSN:
0960-1481
Subject:
siloxanes,   etc   ; air; biogas; boilers; combustion; flow resistance; heat exchangers; household equipment; risk; silica; silicon;     Show all 11 Subjects
Abstract:
... The effects of silica deposition resulting from the combustion of siloxane-containing biomethane on the performance of seven domestic appliances have been studied. The results show that silica deposition increases the flow resistance across the heat exchangers, which consequently reduces the air intake from the surroundings. For the flow-through hot water heater studied, the reduction in air intak ...
DOI:
10.1016/j.renene.2018.07.143

19. Interaction of Poly(dimethylsiloxane) and octamethylcyclotetrasiloxane with aluminum oxides comprising different acid-base properties

Author:
Kochanke, Artur; Üffing, Christoph; Hartwig, Andreas
Source:
Polymer degradation and stability 2019 v.161 pp. 19-29
ISSN:
0141-3910
Subject:
siloxanes,   etc   ; Raman spectroscopy; adhesion; aluminum oxide; catalytic activity; heterolytic cleavage; thermogravimetry;     Show all 7 Subjects
Abstract:
... Interactions between polymer matrices and inorganic mineral surfaces are especially relevant in polymer-filler composites and in adhesion science. Knowledge about underlying mechanisms at the interphase is a prerequisite for understanding functionality and aging. Therefore, interactions of poly(dimethylsiloxanes) (PDMS) and octamethylcyclotetrasiloxane (D4) with aluminum oxides comprising differen ...
DOI:
10.1016/j.polymdegradstab.2019.01.010

20. A flexible and convenient strategy for synthesis of ionic liquid bonded polysiloxane stationary phases

Author:
Zhao, Xiaojie; Tan, Kaifeng; Xing, Jun
Source:
Journal of chromatography 2019 v.1587 pp. 197-208
ISSN:
0021-9673
Subject:
siloxanes,   etc   ; alcohols; alkanes; aromatic amines; esters; gas chromatography; imidazoles; ionic liquids; moieties; thermal stability;     Show all 10 Subjects
Abstract:
... Ionic liquid bonded polysiloxanes (PILs) are a class of polysiloxanes whose side chains contain ionic liquid (IL) moieties. Considering their excellent selectivity and thermo-stability, PILs have great potentials in the development of polar stationary phases for gas chromatography. In this paper, a novel synthesis strategy for PILs is proposed to diversify PIL stationary phases and also facilitate ...
DOI:
10.1016/j.chroma.2018.12.021