Abstract
Ethylene-propylene elastomers (EPR and EPDM), which generate free radicals at considerable rate during gamma irradiation, show the competition between crosslinking and degradation of these materials in the temperature range from 130 °C to 150 °C. The overall effect of simultaneous processes on the studied polymers is evaluated by the oxygen uptake method. The oxidation rate depends on the pre-existance of peroxyl radicals. If the temperature is not high enough to promote degradation, oxygen consumption will be stopped when the free radical concentration reaches trace level.
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