Dielectric properties and morphology of polymer electrolyte based on poly(epsilon-caprolactone) and ammonium thiocyanate

Woo, H.J. and Majid, Siti Rohana and Arof, Abdul Kariem (2012) Dielectric properties and morphology of polymer electrolyte based on poly(epsilon-caprolactone) and ammonium thiocyanate. Materials Chemistry and Physics, 134 (2-3). pp. 755-761. ISSN 0254-0584

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Official URL: https://doi.org/10.1016/j.matchemphys.2012.03.064

Abstract

In this paper, the frequency dependence of dielectric and electric modulus as well as morphological characteristics of poly (epsilon-caprolactone) (PCL)-ammonium thiocyanate (NH4SCN) polymer electrolyte are investigated. Dielectric analysis shows that electrode polarization masks the dielectric relaxation. The loss tangent peak shifts towards higher frequency with increasing salt content up to 26 wt-%. Long range conductivity relaxation is indicated as a resonance peak in imaginary electric modulus, M '' versus frequency plot. The normalised peaks of M '' and Z '' (imaginary impedance) with log f is observed to overlap. This implies that the relatively fast segmental motion of the polymer couples with ion diffusion. Hence, transport is enhanced at room temperature, which is much higher than the glass transition temperature of PCL (-60 degrees C). From morphology studies, the number of spherulites are observed to increase with a reduction in their size when more salt is added to PCL. This observation is accompanied by an enhancement in conductivity and increase in the amorphous phase. When 32 wt-% of salt is added, agglomeration appears due to the formation of ion clusters or higher aggregates as deduced from SEM micrographs. (c) 2012 Elsevier B.V. All rights reserved.

Item Type: Article
Additional Information: Department of Physics, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA
Uncontrolled Keywords: Electrical energy-storage; Conductivity relaxation; Epsilon-caprolactone; Solid electrolytes; Ionic-conductivity; Modulus; Batteries; Impedance; Transport; Triflate
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Dept of Physics
Depositing User: Miss Malisa Diana
Date Deposited: 17 Jul 2013 00:46
Last Modified: 27 Aug 2019 01:16
URI: http://eprints.um.edu.my/id/eprint/7703

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