Charging transient in polyvinyl formal

Abstract

In the present paper charging and discharging transient currents in polyvinyl formal (PVF) were measured as a function of temperatures (40-80°C), poling fields (9.0 × 103-9.0 × 104 V/cm) and electrode combinations (Al-Al, Au-Al, Zn-Al, Bi-Al, Cu-Al and Ag-Al). The current-time characteristics have different values of slope lying between 0.42-0.56 and 1.12 1.63. The polarization is considered to be due to dipolar reorientation associated with structural motions and space charge relaxations due to trapping of injected charge carriers in energetically distributed traps.