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Effects of water sorption at different temperatures on permanent changes in an epoxy
Author(s) -
Netravali A. N.,
Fornes R. E.,
Gilbert R. D.,
Memory J. D.
Publication year - 1985
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.1985.070300422
Subject(s) - exothermic reaction , epoxy , sulfone , activation energy , materials science , epoxide , sorption , glass transition , nuclear chemistry , polymer chemistry , chemistry , composite material , organic chemistry , adsorption , polymer , catalysis
Crosslinked epoxy resins, tetraglycidyl 4,4′‐diamino diphenyl methane cured with 4,4′‐diamino diphenyl sulfone, were soaked in water at either 25°C or 70°C for varying lengths of time. The infrared spectra and DSC thermograms were obtained for samples that were soaked, or soaked and dried. There was a monotonic decrease in exothermic reaction energy with water content. The glass transition was also lowered, although samples soaked at 70°C showed a leveling in the T g around 115°C. When the soaked samples were dried, the exothermic reaction energy showed near reversibility for samples soaked at 25°C while the 70°C samples were highly irreversible. IR of the latter samples showed that the 70°C water soaking resulted in reaction of some of the unreacted epoxide groups that remained after the initial cure.