Sains Malaysiana 42(4)(2013): 475–479

Conductivity and Dielectric Properties of Proton Conducting Poly (Vinyl) Chloride (PVC) Based Gel Polymer Electrolytes

(Kekonduksian dan Sifat Dielektrik Proton Menjalankan Poli (Vinyl) Klorida (PVC) Berdasarkan Gel Polimer Elektrolit)

Siti Khatijah Deraman & R.H.Y. Subban*

Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam,

Selangor D. E. Malaysia

N.S. Mohamed

Centre for Foundation Studies in Science, University of Malaya,

50603 Kuala Lumpur, Malaysia

Received: 14 June 2011/Accepted: 3 April 2012

ABSTRACT

Poly (vinyl) chloride (PVC)-NH4I-EC films have been prepared by the solution cast technique. The sample containing 30 wt.% NH4I exhibited the highest room temperature conductivity of 4.60 × 10^-7 S cm^-1. The conductivity increased to 1.08 × 10^-6 S cm^-1 when 15 wt.% of ethylene carbonate (EC) was added to 70 wt.% PVC - 30 wt.% NH4I. The effects of ethylene carbonate (EC) addition on the frequency dependent dielectric properties of PVC based electrolytes were investigated by electrochemical impedance spectroscopy (EIS), in the temperature range of 300 K to 373 K. The dielectric properties and ac conductivity of the samples prepared have been analyzed. The values of dielectric constant were found to increase with increasing conductivity of the samples. Analysis of the ac conductivity data revealed the electrolytes to be of the non-Debye type with conduction mechanism of the overlapping-large-polaron-tunneling (OLPT) model.

Keywords: Dielectric properties; gel polymer electrolyte; non-Debye type; OLPT; proton conductivity

ABSTRAK

Poli (vinil) klorida (PVC)-NH4I-EC filem telah disediakan dengan teknik larutan tuangan. Sampel yang mengandungi 30 berat.% NH4I mempamerkan kekonduksian suhu bilik tertinggi sebanyak 4.60 × 10^-7 S cm^-1. Kekonduksian meningkat kepada 1.08 × 10^-6 S cm^-1 apabila 15 % berat etilena karbonat (EC) telah ditambah kepada 70 % berat PVC - 30 % berat NH4I. Kesan etilena karbonat (EC) ke atas sifat dielektrik kekerapan bergantung kepada elektrolit berasaskan PVC telah dikaji oleh spektroskopi impedans elektrokimia (EIS), dalam julat suhu 300 K hingga 373 K. Sifat dielektrik dan kekonduksian ac sampel yang disediakan telah dianalisis. Nilai-nilai pemalar dielektrik didapati meningkat dengan meningkatnya kekonduksian sampel. Analisis kekonduksian data ac menunjukkan elektrolit untuk jenis bukan Debye dengan mekanisme pengaliran model yang bertindih besar-terowong polaron (OLPT).

Kata kunci: Gel polimer elektrolit; jenis bukan-Debye; OLPT; proton konduktiviti; sifat dielektrik

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*Corresponding author; email: rihanum43@salam.uitm.edu.my