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

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• 作者：H.J. Woo ; S.R. Majid ; A.K. Arof ; ^{akarof@um.edu.my}
• 关键词：Polymer electrolyte ; Poly(蓻-caprolactone) ; Ammonium thiocyanate ; Dielectric properties ; Electric modulus ; Micrograph ; Coupling
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：15 June, 2012
• 卷：134
• 期：2-3
• 页码：755-761
• 文件大小：770 K

摘要

In this paper, the frequency dependence of dielectric and electric modulus as well as morphological characteristics of poly (蓻-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聽wt-%. Long range conductivity relaxation is indicated as a resonance peak in imaginary electric modulus, M鈥?versus frequency plot. The normalised peaks of M鈥?and Z鈥?(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 (鈭?0聽掳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聽wt-%of salt is added, agglomeration appears due to the formation of ion clusters or higher aggregates as deduced from SEM micrographs.