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Ionic conductivity for polymethyl acrylate (PMA) and polyvinyl acetate (PVAc) blend at composition 90:10 in the presence of tetrapropyl ammoinum iodide (TPAI) showed linear increment with temperature. At selected frequencies, the values for both dielectric constant, εr and dielectric loss, εi are found to increase with temperature. It is also found that the variation of εr is in agreement with conductivity variation of PMA/PVAc-TPAI samples. The imaginary part of electric modulus,Mi showed the occurance of dispersion peak. Relaxation time of ionic charge carrier are extracted from the Mi maximum peak at various temperatures. It is found that relaxation time decreased with increasing temperature from ~10-4 s at 343 K to ~10-5 s at 373 K.

The polymer electrolyte composed of poly (ethylene oxide) (PEO) and sodium iodide (NaI) as dopant salt was prepared by using solution casting method. Effect of temperature on the conductivity performance was studied by impedance spectroscopy in the temperature range of 303 to 343K. The linear variation of conductivity with temperature suggests the Arrhenius type thermally activated process. The effect of temperature on the conductivity is discussed on the basis of number, n, mobility, μ and diffusion coefficient, D of free ions. In this paper, n, μ and D were determined using impedance spectroscopy method.