| Abstract: | The use of blocked electrodes in thermally stimulated depolarization current (TSDC) measurements has been studied on phenol–formaldehyde novolac resin blocked by one or two Teflon foils. The measurements were performed after polarization at different temperatures Tp separately for the Teflon and the resin. Blocking decreases the effectiveness of a nominal polarizing field and suppresses the background current. It is explained here for the first time that the charge released from the charged Teflon interferes with the conductivity relaxation peak of the resin. The influence of the blocking is very dependent upon Tp, and this dependence is specific in regard to the type of current peak. The application of blocking at different Tp is recommended for the determination of the origin of peaks in TSDC measurements. |
