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Effect of chain extender on the morphology, thermal, viscoelastic, and dielectric behavior of soybean polyurethane
Author(s) -
Favero Diana,
Marcon Victória,
Figueroa Carlos A.,
Gómez Clara M.,
Cros Ana,
Garro Nuria,
Sanchis Maria J.,
Carsí Marta,
Bianchi Otávio
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50709
Subject(s) - polyurethane , dielectric , materials science , morphology (biology) , viscoelasticity , amorphous solid , hydrogen bond , phase (matter) , chemical engineering , polymer chemistry , composite material , crystallography , chemistry , organic chemistry , molecule , genetics , optoelectronics , engineering , biology
The objective of this work was to determine the influence of different chain extenders (CEs) on the morphology, thermal, viscoelastic, and dielectric properties of soybean polyurethane (PU). The PU with ethane‐1.2‐diol showed a more organized structure, which was attributed to the smaller amount of methylene groups (CH 2 ) and the shorter distance between the hydrogen bonds. While, PUs with dipropylene glycol, the free volume increased due to the less effective interactions formed between the hard and soft domains. The α, β, and γ transitions dipolar by conductive process, are probably associated with (a) local motions of the main chain, (b) the smaller groups rotation motions in the fatty acid chains in the soft phase, and (c) the CH 2 group rotation motion in the amorphous region. The phase‐separated morphology is most evident at high temperatures due to the Maxwell–Wagner–Sillars interfacial polarization process.