Abstract
In this paper, thermally stimulated currents (TSC) of corona-charged PTFE film were studied. Corona electrets which were formed by applying high voltages ${\pm}$5∼${\pm}$8[kV], to PTFE film of 100[$\mu\textrm{m}$] thickness, were experimented to measure TSC in the temperature range from -100[$^{\circ}C$] to 200[$^{\circ}C$]. As the result, four peaks of ${\gamma}$, ${\beta}$$_2$, ${\beta}$$_1$ and ${\alpha}$ were obtained at the temperature of -40[$^{\circ}C$], 30[$^{\circ}C$], 90[$^{\circ}C$] and 170[$^{\circ}C$], respectively. Speaking of the origins of these peaks, first of all, ${\gamma}$ peak is believed to show up by virtue of CF$_2$groups. B$_2$ peak seems to turn up by detrapping of the electrons which are accelerated by the corona exposure. ${\beta}$$_1$ peak looks to be ascribed to detrapping of the dipole and the trapped electron. Finally, ${\alpha}$ peak appears to result from detrapping of the electrons which are trapped in the para-crystalline region.