Abstract
A study was made of features of the thermal and thermo-oxidative degradation of high and low density polyolefins and ethylene-propylene copolymers irradiated with from 1 to 300 Mrad. It was found that structural changes in the polymers under irradiation, while increasing the thermal stability of the latter, lead to reduced thermo-oxidative stability It is suggested that trans-vinylene unsaturation promotes the development of thermal degradation of the irradiated polymers, while vinylidene unsaturation inhibits this process. It is shown that crosslinks, tertiary carbon atoms and α-carbon atoms relative to the trans-vinylene double bond are the most vulnerable points during oxidation of the irradiated polymers. Crosslinking involving the formation of ether bonds takes place simultaneously with degradation occurring during oxidation of the irradiated polymers.
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