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Study of polarization parameters effect on dipolar relaxation in epoxy-based polymer using thermally stimulated depolarization current

Published online by Cambridge University Press:  03 March 2014

Emna Zghal ,
Fatma Namouchi  and
Hajer Guermazi
Emna Zghal
Affiliation:
Research Unit, Physics of Insulating and Semi-Insulating Materials, Faculty of Sciences, University of Sfax, B.P. 1171, 3000 Sfax, Tunisia
Fatma Namouchi*
Affiliation:
Research Unit, Physics of Insulating and Semi-Insulating Materials, Faculty of Sciences, University of Sfax, B.P. 1171, 3000 Sfax, Tunisia
Hajer Guermazi
Affiliation:
Research Unit, Physics of Insulating and Semi-Insulating Materials, Faculty of Sciences, University of Sfax, B.P. 1171, 3000 Sfax, Tunisia
*
ae-mail: fatma_namouchi@yahoo.fr
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Abstract

In this paper, dipolar relaxation processes in epoxy-based polymer were investigated under various polarization conditions, using thermally stimulated depolarization current (TSDC) technique. The TSDC spectrum of un-poled epoxy polymer reveals an unusual negative current, associated with a thermally generated charge carriers, which were due to impurities ionization and structural changes mainly at high temperature (above Tg). β and α dipolar relaxations were detected respectively around 115 °C and 154 °C in conventionally poled sample at TP=110 °C and EP= 3 kV/mm. Dipolar relaxation parameters were evaluated using two techniques: (1) theoretical decomposition of global complex TSDC spectrum, using Bucci-Fieschi expression based on single Debye process, (2) experimental procedure based on selective polarization, commonly known as windowing polarization (WP). The obtained values are TP dependent: relaxation time decreases and activation energy increases when polarization temperature increases. An ω relaxation peak due to water molecule departure was detected around 135 °C, using WP techniques for TP=100 °C Unlike dipolar relaxations, its position is independent of polarization temperature. Complementary thermal analysis investigations by differential scanning calorimetric (DSC) and thermogravimetric analysis (TGA), were made to support some given conclusions.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 65 , Issue 3 , March 2014 , 31302
Copyright
© EDP Sciences, 2014

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