Eur. Phys. J. Plus (2015) 130: 76
https://doi.org/10.1140/epjp/i2015-15076-6

Regular Article

Dielectric relaxations investigation of a synthesized epoxy resin polymer

¹ Unity of Physics of Insulating and Semi-Insulating Materials, Faculty of Sciences of Sfax, University of Sfax, B.P. 1171, 3000, Sfax, Tunisia
² Grenoble Electrical Engineering Laboratory (G2ELab), Grenoble University Alpes & CNRS (UGA), Grenoble, France
³ SATIE, UMR 8029, CNRS, ENS Cachan, Cnam, 292 rue Saint Martin, 75003, Paris, France
⁴ LCSN, Université de Limoges, 123 Avenue Albert Thomas, 87060, Limoges cedex, France
⁵ CRML, Université du Québec à Trois-Rivières, 3351 boul. des Forges, C.P. 500, G9A 5H7, Trois-Rivières, QC, Canada

^* e-mail: jilaniwissal@yahoo.com

Received: 17 October 2014
Revised: 21 March 2015
Accepted: 24 March 2015
Published online: 20 April 2015

Abstract

A diglycidylether of bisphenol A (DGEBA) epoxy resin was synthesized, and cured with 3,3′-diaminodiphenyl sulfone (DDS) at a curing temperature of 120 °C. The relaxation properties of the realized polymers were studied by two complementary techniques: dielectric relaxation spectroscopy (DRS), in the temperature range 173–393K and in the frequency interval 10⁻¹–10⁶ Hz, and thermally stimulated depolarization current (TSDC) with a windowing polarization process. Current-voltage (I–V) measurements were also carried out to study interfacial relaxations. Dielectric data were analyzed in terms of permittivity and electric modulus variations. Three relaxation processes (γ, β and α) have been identified. They were found to be frequency and temperature dependent and were interpreted in terms of the Havriliak-Negami approach. Relaxation parameters were determined by fitting the experimental data. The temperature dependence of the relaxation time was well fitted by the Arrhenius law for secondary relaxations, while the Vogel-Fulcher-Tamann model was found to better fit the τ(T) variations for α relaxation. We found τ ₀ = 4.9 10⁻¹² s, 9.6 10⁻¹³ s and 1.98 10⁻⁷ s for γ, β and α relaxations, respectively. The obtained results were found to be consistent with those reported in the literature. Due to the calculation of the low-frequency data of dielectric loss by the Hamon approximation, the Maxwell-Wagner-Sillars (MWS) relaxation was highlighted.