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Relaxations of bisphenol A‐based epoxides cured with aliphatic diamines
Author(s) -
Matsukawa Mami,
Okabe Hirotaka,
Matsushige Kazumi
Publication year - 1993
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.1993.070500109
Subject(s) - activation energy , arrhenius equation , bisphenol a , relaxation (psychology) , dielectric , polymer chemistry , epoxy , materials science , thermodynamics , chemistry , composite material , physics , psychology , social psychology , optoelectronics
The main α and sub β relaxations in bisphenol A‐based epoxides cured by two kinds of aliphatic diamines were examined in wide temperature and frequency ranges by using middle‐frequency dynamic, dielectric, and ultrasonic measuring systems. The obtained temperature–frequency correlation maps revealed an Arrhenius‐type behavior for the β relaxation with apparent activation energy of 16 kcal/mol. For the α relaxation, the maps were in good agreement with the W.L.F. equation. Owing to the similarity of structure in these resins, both maps showed the same tendencies. © 1993 John Wiley & Sons, Inc.