The thermally stimulated current of oriented polypropylene irradiated by Co60-γray

The authors present the results of an investigation of the behavior of carriers for nonirradiated and irradiated OPP film by 1 and 5 Mrad. The investigation of electrical properties was performed using the thermally stimulated current (TSC) technique. The first peak of the TSC spectrum appeared due to the carbonyl group `C=0´ in the amorphous phase of the polymer. The second peak is attributed to the process of detrapping of ions from the thermal excitation in the crystalline phase. The dipole moment obtained from the first peak was in the range of 0.7-1.7 Debye. The hopping length of the carriers at the condition of the second peak is several tens of Å. The activation energy obtained from the first peak was 0.2-0.7 eV and that obtained from the second peak was 0.3-1.1 eV