Thermal Effects in gamma-Irradiated Elastomers

摘要

It was found that heating of polymer compositions based on ethylene-propylene and fluorine rubbers irradiated preliminarily at 293 K with a dose of 1 MGy (gamma-quanta from~(60)Co)is accompanied by substantial heat evolution(approx 20 kJ/kg).The heat evolution may be due to recombination of thermally stable allylic and flu-oroalkyl radicals.The radical concentrations and radiation chemical yields are fairly high and comparable with those observed for similar polymers at 77 K.This may be due to the low absorbed dose rate used in this study (-0.5 Gy/s).