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Dielectric and viscoelastic properties of some meta‐tetramethyl xylene diisocyanate‐based polyurethanes as a function of sample composition
Author(s) -
Capps Rodger N.,
Stack Gary M.,
Samuels Mary Q.,
Beumel Linda L.
Publication year - 1992
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.1992.070450706
Subject(s) - dissipation factor , materials science , polyurethane , polycaprolactone , composite material , viscoelasticity , polybutadiene , dielectric , toluene diisocyanate , permittivity , polymer , phase (matter) , polymer chemistry , copolymer , chemistry , organic chemistry , optoelectronics
A series of linear segmented polyurethanes were synthesized, based on soft segments of polycaprolactone having an average number molecular weight of 2100, or hydroxy–terminated polybutadiene having an approximate molecular weight of 2800. Hara segments were made of meta–tetramethyl xylene diisocyanate and diethyl toluene diamine. The dynamic Young's modulus and loss tangent, relative permittivity, and dielectric loss, were found to be significantly affected by soft segment polarity and hard segment content. These results are discussed in terms of polymer morphology, such as degree of phase separation and soft segment phase state.