Electrical Conduction and Dielectric Relaxation Phenomena of PVA Based Polymer Electrolyte Films

Conducting polymer electrolyte (CPE) films based on poly(vinyl alcohol) (PVA) complexed with NaI salt were prepared by a solution cast technique. The structural properties of these electrolyte films were examined by XRD studies. The XRD results revealed that the amorphous domains of PVA polymer matrix were increased with the increase of NaI salt concentration. The glass transition temperature (T g ) of these systems was determined by DSC thermograms. Electrical conductivity was measured in the temperature range of 303-373 K and the conductivity was found to increase with the increase of dopant concentration, as well as temperature. The activation energy values were 0.478, 0.351, 0.319 and 0.284 eV for pure and 10%, 20% and 30% NaI complexed PVA films, respectively. The dielectric constant (ϵ′) was found to increase with the increase of temperature and decrease with the increase of frequency. Dielectric relaxation phenomenon was observed in the dielectric loss spectra and is attributed to the orientation o...