Thermally stimulated depolarization TSD

The principal characteristics of the triboelectret state in polymers recorded experimentally are i) the efficient surface charge density (ESCD) value and ii) the thermally stimulated depolarization (TSD) current spectrum, i.e. the discharge current dependence of the electret on its heating temperature. The analysis of TSD spectra helped to estimate the parameters of the triboelectret state, including the homo- to heterocharge relation in a dielectric, activation energy of the charge relaxation processes, relaxation time and others. 

Thermally stimulated depolarization (TSD) current was also measured using an Ekco type 616B electrometer. The samples were polarized at the following conditions polarization temperature 150 0, polarization time 2 min, electric field 8 kV/cm. The heating rate was 1°C/min. 

Bisphenol-A carbonate has been widely studied by dielectric [8-26], dynamic mechanical [27 31] and thermally stimulated depolarization (TSD) [10- 13 32 35] techniques. However, differences in the compositions of the materials studied, and in their thermal history and pretreatment, have led to apparently conflicting results being reported in the literature, as discussed in detail in a recent paper [6]. In the present study contour maps of complex relative permittivity for both basic and u.v.-resistant grades of LEXAN have been obtained over an extended range of experimental conditions using a single apparatus, with each grade of material subject to the same thermal history. 

Thermally stimulated depolarization (TSD), e.g. [101]. TSD is applicable to dielectric polymers that are electrets. Depolarization currents are monitored and these currents are related to the relaxation of electric charges in the sample as a function of the number of events that take place in the sample at the molecular and supermolecular level. 

Keywords thermally stimulated ciurent (TSC), thermally stimulated polarization (TSP), thermally stimulated depolarization (TSD), Williams-Landel-Ferry (WLF) equation, relaxation, theimorheology, activation energy, ionic mobility, interfadal relaxation. 

Surface conditions influence partial discharge behavior as well. Thermally stimulated polarization (TSP) and depolarization (TSD) properties of PP/CaC03/nonionic surfactant systems [12] have been studied. TSP curve of a simple PP/CaC03 composite, containing no surfactant, stored under ambient... 

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