Thermally stimulated currents of ethylene-propylene rubber with filler

We are studying the effect of filler on the electrical properties of Ethylene-Propylene Rubber (EPR). In this paper we have measured the Thermally Stimulated Currents (TSC) of EPR with hard clay to investigate the distribution of the relaxation time, and obtained the variation of TSC curve with the temperature T_b at which the sample is polarized. When the temperature T_b is lower than room temperature, the TSC curve has only one peak. But for higher values of T _b, the TSC curve exhibits three peaks (P_H, P_M , and P_L peaks in the order of descending temperature). Assuming two layer interfacial polarization between rubber and filler having a distributed thickness of rubber layer, we have calculated the relation between the TSC curve and the polarizing temperature T_b . From these calculation we think that the P_M peak is caused by two layer interfacial polarization having a distributed thickness of rubber layer