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Characterization, AC Impedance Study and Dielectric Properties of Chemically Synthesised Poly Para-Toluidine

Author Affiliations

  • 1PG and Research Department of Chemistry, Auxilium College, Vellore, Tamil Nadu 632006, INDIA

Res.J.chem.sci., Volume 5, Issue (9), Pages 1-10, September,18 (2015)

Abstract

The present work is an investigation of AC impedance behaviour of Poly (para-toluidine). The polymer was synthesized by oxidative chemical polymerization of para toluidine in aqueous HCl using potassium dichromate as an oxidant at 0–3°C. The synthesized polymer was characterized by UV-VIS-NIR, FT-IR, XRD, SEM, and their thermal studies were carried out using TGA and DTA. The AC conductivity and dielectric behavior were investigated at a temperature varying from 298 to 373 K in the frequency varying from 20 Hz to 106 Hz. The AC conductivity increases as temperature is increased. In the entire range, the universal power law σacω = Aωs holds well. The polymer displays a decrease in frequency exponent ‘S’ value in the entire temperature range of study and hence follow Correlated Barrier. As frequency decreases dielectric constant and dielectric loss increases exhibiting strong interfacial polarization at low frequency and the dissipation factor also decreases with frequency. At higher frequencies it exhibits almost zero dielectric loss which suggests that this polymer is lossless material at frequencies beyond 105Hz .Complex electric modulus exhibits two relaxation peaks, indicating two-phase structure as indicated by a bimodal distribution of relaxation process.

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