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Low-Frequency Dielectric Relaxation in Polycarbonate and Polypropylene Blends

Low-frequency dielectric relaxation was studied in compression-molded thin films of polypropylene (PP)-polycarbonate (PC) blends of various weight ratios by analyzing the transient currents. The effect of various parameters such as field strength, charging time and charging temperature on the transient discharge currents was studied. Comparative studies of the isochronal characteristics (i.e. current-temperature plots at fixed times) with the thermally-stimulated depolarization and polarization currents were also carried out in order to find possible correlations between the phenomena observed by the different methods. All the results indicate that polarization (or dielectric relaxation) in the polyblends is due to induced dipoles formed by deep trapping of charge carriers-injected as well as bulk-produced.