Abstract
Changes in the specific heat capacity of ethylene-propylene-diene terpolymer (EPDM) containing 3.5% ENB were investigated over a temperature range from 340 up to 440 K. Exposure to gamma radiation was carried out at various doses up to 600 kGy. Evaluation of c p was done using O'Neill's method with aluminia as standard. Specific heat capacity of EPDM changed differently if irradiation was performed in air or in vacuum. The shape of c p = F( T) curves depends on the competition of scission and crosslinking and on later reactions involving long life radicals. Radiation resistance of EPDM can be evaluated by determination of change in specific heat capacity.
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