TSC STUDY OF THE POLAR AND FREE CHARGE PEAKS OF AMORPHOUS POLYMERS

We have seen in electrets of amorphous polyethylene-terephthalate, usi ng thermal windows to polarize and thermally stimulated depolarization currents dielectric spectroscopy as a technique of analysis, that the polar peak (alpha) and the free charge one (rho) show a maximal area at polarization temperatures T(p) that we call the temperature of opti mal polarization T(po). The T(po) of alpha is almost-equal-to 70-degre es-C arid for T(p) > T(po) the temperature at which the maximum intens ity appears remains constant with T(p). For this range of temperature the intensity of the maximum decreases and the polarization is linear with 1/T(p). On the other hand, the second peak (rho), which has a T(p o) almost-equal-to 87-degrees-C, for T(p) > T(po) shows the maximum in tensity at temperatures that are linear with T(p). For this range of t emperatures the intensity of the maximum decreases with T(p) and the p olarization is not linear with 1/T(p). These results are compared with those obtained from polyvinylchloride and polymethylmethacrylate.