DETERMINATION OF DIELECTRIC-RELAXATION TIME AS A FUNCTION OF PRESSURE AND TEMPERATURE BY THE THERMALLY STIMULATED CURRENT METHOD

The thermally stimulated current (TSC) has been used over a wide range of pressure to determine the principal characteristics of the polymers such as the activation volume ΔV, the activation energy ΔE, and the preexponential term τ0 of the Arrhenius-type relaxation time: τ=τ0 exp[(PΔV+ΔE)/kT]. Experimentally, the 6-Polyamide sample is subjected to a high hydrostatic pressure before application of the classical TSC method. The variation law of the relaxation time, a function of temperature and pressure, τ (P,T), of this polymer is given by the determination of these characteristics with the initial slope analysis of the TSC experimental curves.