Dielectric behavior and AC electrical conductivity analysis of PMMA films

Bushra A Hasan

doi:10.30723/ijp.v11i20.381

Abstract

PMMA films of different thickness (0.006, 0.0105, 0.0206, 0.0385 and 0.056cm) were synthesized by casting process. The temperature and frequency dependence of dielectric constant and AC electrical conductivity measurements at various frequencies (10kHz-10MHz) and temperatures (293-373K) were carried out. Few anomalies in dielectric studies were observed near 313 and 373 K respectively. These points were related to glass transitions temperature. The variation of activation energy and conduction behavior was studied .From the AC conduction studies, it is confirmed that the mechanism responsible for the conduction process is hopping of carriers. The variations of the dielectric constant and loss as function of frequency at different temperature was observed and the results were discussed. The calculated activation energy varied with the thickness, temperature, and applied frequency. Conductivity plots against frequency suggested that the response obeying the universal power law concerning the AC conductivity and dielectric behavior of polymer. The polarizability a increases with temperature but decreases with thickness indicating weekends and rising of intermolecular forces respectively.

Highlights

Electrical properties constitute one of the most convenient and sensitive methods for studying the polymer structure Ferraro and Walkar 1965[1]; Kimura and Kajiwara 1998[2].The interest in organic and polymeric semiconductors has arisen, because of their electro photo graphic and solar cell applications
The electrical conductivity of polyaniline doped polyvinylchloride (PVC) and poly (methyl metha-crylate (PMMA) thin films has been measured by studying the I–V characteristics at various temperatures in the range 323–363 K by DESHMUKH et al 2007 [8]
The present paper reports the AC Conduction and Dielectric studies made on PMMA thin films.In the present investigation, the synthesis of PMMA is achieved

Summary

Introduction

Electrical properties constitute one of the most convenient and sensitive methods for studying the polymer structure Ferraro and Walkar 1965[1]; Kimura and Kajiwara 1998[2].The interest in organic and polymeric semiconductors has arisen, because of their electro photo graphic and solar cell applications. Belsare and Deogaonkar (1998) [6] measured the electrical conductivity of iodine doped poly blend films of polystyrene (PS) and poly (methyl methacrylate) (PMMA).

Results

Conclusion