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Mechanical and thermal properties of epoxy resins with reversible crosslinks
Author(s) -
Engelberg P. I.,
Tesoro G. C.
Publication year - 1990
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760300507
Subject(s) - epoxy , materials science , glass transition , ultimate tensile strength , composite material , curing (chemistry) , dynamic mechanical analysis , modulus , epoxide , polymer , organic chemistry , chemistry , catalysis
The tensile properties: Young's modulus, ultimate tensile strength, ultimate elongation, the glass transition temperature, and the dynamic mechanical properties (dynamic shear modulus ( G '), loss tangent (Tan δ)), of three epoxy resins (Epon 828, Epon 836, Epon HPT 1071) cured with the disulfide‐containing crosslinking agent—4.4‐dithiodianilme (DTDA) have been characterized. The results show that DTDA is a satisfactory crosslinking agent for the epoxide resins that have been studied as compared to the well‐known curing agent methylene dianiline (MDA). There are no significant differences between the properties of Epon 828 cured with DTDA at stoichiometric ratio (2:1) and Epon 828 cured with DTDA at small amine excess ratio (1.75:1). The glass transition temperature of the cured tetrafunctional epoxy resin Epon HPT 1971 (235°C) is significantly higher than that of difunctional epoxy resins such as Epon 828 ( T g –175°C), but the product is too brittle to be used without plasticizer.