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Abstract
By using thermally stimulated depolarization current (TSDC) technique, and coupling it with the thermal sampling (TS) method, the relaxation behavior of Poly(vinyl chloride-co-vinylacetate-co-2-hydroxypropyl acrylate) (PVVH) has been investigated in the vicinity of its glass transition temperature, Tg. The global TSDC spectra of amorphous PVVH with varying the poling field and poling temperature revealed the presence of two TSDC peaks. The first peak at about 347 K and is ascribed to the glass transition temperature and can be referred as α-relaxation. The second one is obtained in the temperature range 353–383 K and is attributed to the space charge relaxation and can be referred as ρ-relaxation. Fine structure of α-relaxation peak was obtained using the thermal sampling method. All the molecular parameters, such as activation energy (Ea) and preexponential factor (τ0), have been estimated. In addition, the compensation law was found to be valid; and the compensation parameters such as compensation temperature (Tc) and compensation time (τc) have been determined.
ACKNOWLEDGMENT
The authors are indebted to Prof. Dr. M. D. Migahed for his fruitful discussion and comments.
