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Dynamic mechanical properties of quinazolone–imide block copolymer
Author(s) -
Fukami Akira,
Iisaka Katsuyoshi,
Kubota Shigeru,
Etoh Shouhei
Publication year - 1991
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.1991.070421127
Subject(s) - copolymer , imide , materials science , polymer chemistry , prepolymer , condensation polymer , kapton , pyromellitic dianhydride , polyimide , swelling , polymer , polyurethane , composite material , layer (electronics)
Dynamic mechanical properties have been investigated over the temperature range of−150–360°C for the quinazolone–imide copolymers, prepared by condensation of the amine‐terminated quinazolone prepolymer with a stoichiometric quantity of pyromellitic dianhydride or 3,3′,4,4′‐benzophenone‐tetracarboxilic dianhydride. Both copolymers have, respectively, the low‐temperature β‐relaxation and the β * ‐relaxation, as well as the case of poly(4,4′‐oxydiphenylene–pyromellite‐imide) (Kapton) examined for comparison. These relaxations seem to contribute to toughness of the copolymers. The α‐relaxations for both copolymers occurred at much the same temperature of 320°C, which can be assigned to a large scale segmental motion of the quinazolone chain sequence. The α‐peak temperatures shifted into higher temperatures by heat aging. This can be explained in terms of crosslinking in the copolymers, supported by swelling test in hot m ‐cresol and IR spectroscopy.