Abstract
We have modified the thermally stimulated depolarization current (TSDC) theory so that it contains the relaxation obeying the Vogel-Tammann-Fulcher relaxation model. Thermal sampling (TS) technique was used to decompose the complex TSDC spectrum to a number of elementrary peaks. Numerical method is applied for the analysis of TS spectra for the amorphous polar poly(vinyl chloride-co-vinyl acetate-co-2-hydroxypropyl acrylate) (PHHV); poly(methyl methacrylate) (PMMA), and poly(vinyl chloride) (PVC). The characteristic alpha-relaxation peak parameters, namely the pre-exponential factor (τ
0
) and its related Vogel-Tammann-Fulcher (VTF) energy (E
VTF
), for each thermal windowing (TW) experiment were determined. The almost temperature independence of the peak parameters suggests that this behavior is a result of segmental dipole relaxation, and consequently, there is no distribution in both peak parameters.