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Effects of ultraviolet and electron radiations on graphite‐reinforced polysulfone and epoxy resins
Author(s) -
Giori C.,
Yamauchi T.
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.1984.070290122
Subject(s) - polysulfone , epoxy , materials science , irradiation , ultraviolet , graphite , degradation (telecommunications) , composite material , composite number , hydrogen , methane , photochemistry , chemical engineering , chemistry , polymer , organic chemistry , physics , telecommunications , optoelectronics , computer science , nuclear physics , engineering
Degradation mechanisms have been investigated for graphite/polysulfone and graphite/epoxy laminates exposed to ultraviolet and high‐energy electron radiations in vacuum up to 960 equivalent sun hours and 10 9 rads, respectively. Based on GC and combined GC/MS analysis of volatile by‐products evolved during irradiation, several free radical mechanisms of composite degradation have been identified. All the composite materials evaluated have shown high electron radiation stability and relatively low ultraviolet stability as indicated by low G values and high quantum yields for gas formation. Mechanical property measurements of irradiated samples did not reveal significant changes, with the possible exception of UV exposed polysulfone laminates. Hydrogen and methane have been identified as the main byproducts of irradiation, along with unexpectedly high levels of CO and CO 2 . Initial G values for methane relative to hydrogen formation are higher in the presence of isopropylidene linkages, which occur in bisphenol‐A based resins.