Electrical and optical characterization of (PEO+PVAc) polyblend films

Solid polymer blend films based on polyethylene oxide and polyvinyl acetate (PVAc) were prepared in various concentrations by solution cast technique. The features of complexation of the blend films were studied by X-ray diffraction. The electrical conductivity of films was found to increase with increasing PVAc concentration. The conductivity–temperature plots were found to follow Arrhenius nature and showed a decrease in activation energy with increasing PVAc concentration. Optical properties like absorption edge and direct and indirect band gaps were estimated for pure and blend films from their optical absorption spectra. It was found that the energy gap and band edge values shifted to lower energies on blending with PVAc.