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Dielectrical relaxation dynamics and thermally stimulated depolarization current in polymers

S. MINÁRIK1,* , V. LABAŠ1, M. BERKA1

Affiliation

  1. Department of Nonmetallic Materials, Faculty of Materials Sciences and Technology in Trnava, Slovak University of Technology in Bratislava

Abstract

The dynamics of dielectrical relaxation of polymer materials has been studied. Concept for depolarization process simulation based on the primitive charge transport model was proposed for the reason of relaxation mechanisms investigation in polymer structure. Depolarization current in polymer exposed by homogeneous electric field suddenly switched-out in a certain instant of time was calculated on the basis of the model and the model parameters was discussed to achieve consistent results with dielectric relaxation experiments. The aim of our work is to recognize if the dielectrical relaxation and depolarization are connected with the same process of spatial rearrangement of fixed charge carriers of dielectric system. In this paper the investigation of polymer relaxation dynamics by simulations based on the proposed primitive charge carriers transport model is suggested and teoretical principles of thermally stimulated depolarization currents (TSDC) are analysed in term of the model. Experimental results of TSDC measurements in polymethyl-metacrylate (PMMA) and polyethyleneterephthalate (PET) are presented and exploitation of the measured data in polymeric materials research is discussed..

Keywords

Depolarisation, Dielectrical relaxation, Relaxation time, TSDC, PMMA.

Submitted at: Nov. 14, 2006
Accepted at: June 15, 2007

Citation

S. MINÁRIK, V. LABAŠ, M. BERKA, Dielectrical relaxation dynamics and thermally stimulated depolarization current in polymers, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 6, pp. 1592-1596 (2007)