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You searched for: Journal name Journal of polymer science Remove constraint Journal name: Journal of polymer science Publication Year 2019 Remove constraint Publication Year: 2019 Subject term differential scanning calorimetry Remove constraint Subject term: differential scanning calorimetry Subject term crystal structure Remove constraint Subject term: crystal structure
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1. Amorphous copolyesters based on bibenzoic acids and neopentyl glycol

Author:
Hans Eliot Edling; Ryan J. Mondschein; Mark K. Davis; Timothy E. Long; Sam Richard Turner
Source:
Journal of polymer science 2019 v.57 no.5 pp. 579-587
ISSN:
0887-624X
Subject:
acids; condensation reactions; copolymerization; crystal structure; crystallization; differential scanning calorimetry; ethylene glycol; glass transition temperature; melting; melting point; moieties; molecular weight; nuclear magnetic resonance spectroscopy; polyesters; thermal stability; thermogravimetry; thermoplastics; viscosity; weight loss
Abstract:
... High Tg amorphous copolyester thermoplastics were synthesized by incorporating 4,4′‐bibenzoate (4,4′BB) and 3,4′‐bibenzoate moieties into the polyester backbone via melt polycondensation. The high levels of crystallinity typically associated with 4,4′BB containing polyesters were suppressed through copolymerization of ethylene glycol, 1,4‐cyclohexane dimethanol, and neopentyl glycol (NPG) diols. N ...
DOI:
10.1002/pola.29296

2. Critical parameters controlling the properties of monolithic poly(lactic acid) foams prepared by thermally induced phase separation

Author:
Ozgun Can Onder; Emel Yilgor; Iskender Yilgor
Source:
Journal of polymer science 2019 v.57 no.2 pp. 98-108
ISSN:
0887-6266
Subject:
X-ray diffraction; blood platelets; carbon dioxide; crystal structure; differential scanning calorimetry; drying; foams; gelation; gels; methanol; polylactic acid; scanning electron microscopy; separation; solvents; tetrahydrofuran
Abstract:
... Monolithic poly(lactic acid) (PLA) foams were produced by thermally induced phase separation. PLA solutions with concentrations 8–22 wt % were prepared in tetrahydrofuran/methanol (THF/MeOH) solvent/nonsolvent mixtures at 55 °C. Homogenous solutions were quenched at −20 °C to induce phase separation and gelation. Resulting gels were mechanically stabilized by solvent exchange. Subsequent supercrit ...
DOI:
10.1002/polb.24762

3. Effect of a post‐annealing process on microstructure and mechanical properties of high‐density polyethylene/silica nanocomposites

Author:
Bryan Guichard; Philippe Cassagnau; Guillaume Sudre; René Fulchiron; Bastien Ledieu; Eliane Espuche
Source:
Journal of polymer science 2019 v.57 no.9 pp. 535-546
ISSN:
0887-6266
Subject:
X-ray diffraction; annealing; crystal structure; differential scanning calorimetry; exposure duration; mechanical properties; melting point; microstructure; modulus of elasticity; nanocomposites; nanoparticles; polyethylene; silica; small-angle X-ray scattering; thermal stability
Abstract:
... High‐density polyethylene (HDPE) and nanosilica nanocomposites were prepared for SiO₂ content up to 15 wt%. Microstructural characterization evidenced a homogenous distribution of silica aggregates with a mean size increasing with the filler content finally resulting in a rheological percolation between 7.5 and 10 wt%. Nanoparticles did not induce any significant impact on the matrix crystallinity ...
DOI:
10.1002/polb.24809

4. Nascent particle sizes and degrees of entanglement are responsible for the significant differences in impact strength of ultrahigh molecular weight polyethylene

Author:
Huan Zhang; Shicheng Zhao; Xin Yu; Zhong Xin; Chunlin Ye; Zhi Li; Jincheng Xia
Source:
Journal of polymer science 2019 v.57 no.10 pp. 632-641
ISSN:
0887-6266
Subject:
Raman spectroscopy; crystal structure; differential scanning calorimetry; impact strength; industrial applications; molecular weight; particle size; polyethylene; rheological properties; rheometers; scanning electron microscopy; thermal properties
Abstract:
... The physical properties of ultrahigh molecular weight polyethylene (UHMWPE) are generally highly dependent on its molecular weight. However, in our study, it was found that two UHMWPE samples of similar molecular weight, SLL‐5 and GUR 4150, have significantly different impact strengths, with the Charpy impact strength of GUR 4150 being almost 3.4 times that of SLL‐5. To reveal the reasons, the str ...
DOI:
10.1002/polb.24819

5. 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

6. Preparation of ZnO nanoparticle‐reinforced polyamide 6 composite by in situ‐coproduced method and their properties

Author:
Qijie Xu; Ning Zhang; Wei Li; Shuang Zhang; Weiwei He
Source:
Journal of polymer science 2019 v.57 no.2 pp. 165-170
ISSN:
0887-624X
Subject:
X-ray diffraction; crystal structure; crystallization; differential scanning calorimetry; impact strength; melting; nanocomposites; polyamides; polymerization; temperature; tensile strength; thermal properties; thermogravimetry; transmission electron microscopy; zinc oxide
Abstract:
... Polyamide 6/ZnO nanocomposites (noted as PA6/ZnO) were prepared by an in situ co‐producing method, during which Zn₂(OH)₂CO₃ decomposed into nano‐ZnO in the process of the opening‐ring polymerization of caprolactam at high temperature. Transmission electron microscopy, X‐ray diffraction, thermogravimetric analysis, and differential scanning calorimetry were used to analyze the size and dispersive p ...
DOI:
10.1002/pola.29282

7. 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