Impedance spectroscopic and dielectric analysis of PMMA-CO-P4VPNO polymer films

Capacitance and dissipation factor values of polymethyl methacrylate-co-poly 4vinyl pyridine N-oxide (PMMA-CO-P4VPNO) were measured in the frequency range 0.01-100 kHz and temperature range 300-410 K. Dielectric permittivity epsilon' was obtained by capacitance data. The decrease in dielectric permittivity was observed with increasing frequency as well as temperature. The loss peak was observed in the dielectric loss spectra and was identified as the beta-relaxation. Real part of impedance (Z') and imaginary part of impedance (Z) were evaluated from the dielectric data. Frequency dependent conductivity (sigma(ac)) was obtained from complex impedance plots (Cole-Cole plots). Activation energy value obtained from the conductivity data was found to be comparable with activation energy values obtained for other polymers. (C) 2004 Elsevier B.V. All rights reserved.