Charging transient in polyvinyl formal

In the present paper charging and discharging transient currents in polyvin yl formal (PVF) were measured as a function of temperatures (40-80 degreesC ), poling fields (9.0 x 10(3)-9.0 x 10(4) V/cm.) and electrode combinations (Al-Al, Au-Al, Zn-Al, Bi-Al, Cu-Al and Ag-Al). The current-time characteri stics have different values of slope lying between 0.42-0.56 and 1.42-1.63. The polarization is considered to be due to dipolar reorientation associat ed with structural motions and space charge relaxations due to trapping of injected charge carriers in energetically distributed traps.