Abstract
The article compared the effect of heat aging with that of radiation induced degradation of ethylene-propylene copolymer pure vulcanized. Co-60 γ ray was irradiated to samples at room temperature. Dose rate was 1.0kGy/h. Total dose was 50kGy and 96kGy. The rate constant of chain scission of irradiated samples by heat was independent on dose (irradiation time) and was found to be ten times higher than that of non-irradiated. Heat aging was performed in air oven kept at the constant temperatures ranged from 80 to 140°C. The rate constant of the chain scission increases with the heat aging time at all the temperatures. The results suggest that irradiation consumes the antioxidant agents added during polymer production process by the energy transfer from polymer to antioxidant agents. After the consumption of the agent, the rate of scission increases remarkably. On the other hand, heat degrades polymer and antioxidant agent at the same time. With increase the period of heataging time, the effect of antioxidant agent decreases and the rate of scission reaction inreases.
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