Non - Isothermal Depolarization Current Studies in Polyvinyl Pyrrolidone (PVP) Foil Electrets

摘要

Thermally stimulated depolarization current (TSDC) characteristics of Polyvinyl Pyrrolidone (PVP) electrets are studies in the temperature range 30 to 210 °C as functions of the polarizing field (5 to 100kV/cm) and polarizing temperature (40 to 80°C). The TSDC spectra comprise two maxima, namely, β and α with their respective locations around 90 °C and 172.5 °C. These are attributed to dipole-orientation and motion of space charge respectively. The space charge peak (α) is found to be more sensitive to the forming parameters than to that involving dipole. The observed dependence of the peak temperature parameter as well as the activation energy for various peaks on polarizing temperature is indicative of a continuous distribution of relaxations.