Abstract
Degradation of thermoplastics can be evaluated by radiochemical yields of oxygenated products formed during gamma irradiation in air. Stable structures whose concentrations were measured by infra red spectroscopy show unlike behaviour expressed by dose dependence of normalized amounts of CO and COH to 100 eV absorbed energy. In spite of sol-gel content which presents minimum values for all proportions of EPDM/PSt, namely 75 25 , 50 50 and 25 75 , at a ratio of D g D = 0.2 , formation yields of oxygenated products change in a different manner. It was noticed that the formation rate of COH is much greater for the first stage of irradiation than later. In contrast, the increase of CO concentration shows different shaped curves.
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