Solid polymer electrolyte of poly (vinyl chloride) PVC-sodium iodide (NaI) was prepared using solution casting technique. FTIR results suggested that NaI interacted with PVC. Deconvolution of FTIR spectra region were carried out to estimate the relative percentage of number of free ions at the C-Cl stretching vibration band. This result is in good agreement with the conductivity studies as well as the temperature studies..

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