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Effects of crosslink density on mechanical properties of high glass transition temperature polycyanurate networks
Author(s) -
Georjon Olivier,
Galy Jocelyne
Publication year - 1997
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/(sici)1097-4628(19970919)65:12<2471::aid-app18>3.0.co;2-3
Subject(s) - cyanate ester , materials science , composite material , glass transition , toughness , curing (chemistry) , yield (engineering) , fracture toughness , polymer network , deformation (meteorology) , transition temperature , polymer , condensed matter physics , epoxy , superconductivity , physics
Polycyanurate networks of different architecture were synthesized using different curing cycles. Networks with a variable extent of reaction were obtained; the small variation of the cyanate conversion (0.8 to 1) corresponds to a large variation of glass transition temperature (150–290°C) and crosslink density. The mechanical behavior at small and large deformations and the fracture toughness were examined at room temperature and related to the network structural parameters. To explain the puzzling variation of the yield stress and yield strain with the cyanate conversion, recovery experiments were conducted to discriminate anelastic deformation from plastic deformation. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 2471–2479, 1997