Dielectric relaxations and optical properties of polyvinylidene fluoride/chitosan films

Abstract

Polyvinylidene fluoride (PVDF) was blended with different ratios (5%, 7%, and 10% w/w) of chitosan (CS). The dielectric properties of pure PVDF and CS/PVDF films were investigated in (30 °C-140 °C) and (102 Hz-106 Hz) ranges. Both frequency and temperature dependence of the real part, M′, and the imaginary part, M″, of the dielectric modulus were analyzed. The ac conductivity (σac) of all samples was studied to throw light on the conduction mechanism. Results of the UV-vis spectra of the films were discussed to determine important optical parameters when CS is blended with PVDF. There is a good consistency between the dielectric and optical results.