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Investigations of water and high energy radiation interactions in an epoxy
Author(s) -
Netravali A. N.,
Fornes R. E.,
Gilbert R. D.,
Memory J. D.
Publication year - 1984
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.1984.070290129
Subject(s) - differential scanning calorimetry , exothermic reaction , epoxy , materials science , curing (chemistry) , irradiation , infrared spectroscopy , polymer chemistry , nuclear chemistry , epoxide , distilled water , sulfone , composite material , analytical chemistry (journal) , chemistry , organic chemistry , thermodynamics , physics , chromatography , nuclear physics , catalysis
Differential scanning calorimetry (DSC) and infrared spectroscopy (IR) have been used to study the crosslinked epoxy system tetraglycidyl‐4,4′‐diaminodiphenyl methane cured with diaminodiphenyl sulfone. Samples cured at various temperatures were soaked in distilled water for extended periods or irradiated with 0.5 Me V electrons and 60 Co gamma. DSC results show that the standard‐cured (137°C for 2 h and 160°C for 5 h) dry samples have a T g around 190°C and a large exothermic reaction at about 260°C. The latter is attributed to further reaction of curing agent with the epoxide rings. The exothermic energy is about 124 cal/g for an uncured specimen, 42 cal/g for standard cured specimen, and 20 cal/g for soaked samples containing 4% H 2 O. The exothermic energy is shown to decrease monotonically with the ionizing radiation dosage. IR results show a reduction in the intensity of the epoxide band as the exothermic energy is decreased.