Vibrational, thermal and ion transport properties of PVA-PVP-PEG-MeSO4Na based polymer blend electrolyte films

Polyvinyl alcohol (PVA)-polyvinyl pyrrolidone (PVP)-polyethylene glycol (PEG) based polymer blend electrolyte films have been prepared by varying the Sodium methylsulfate (MeSO4Na) salt, in different % ratio using solution cast technique. Various techniques i.e. ATR-FTIR, TGA, DSC and AC Impedance spectroscopy have been used to characterize the prepared samples. ATR-FTIR result shows the complexation of MeSO4Na salt with PVA-PVP polymer blend. TGA results show the thermal stability of polymeric blend electrolyte changes with MeSO4Na content in PVA-PVP based polymer blend and also formation of miscible blend. DSC analysis reveals that single glass transition temperature (Tg) and melting temperature (Tm) changes with increasing MeSO4Na content. The dielectric relaxation frequency, fr has been found to increase with temperature in PVA-PVP-PEG-20MeSO4Na. Ionic conductivity and dielectric relaxation frequency vs. 1/T plots for PVA-PVP-PEG-20MeSO4Na based polymeric films follows the Arrhenius behavior. The maximum conductivity of 1.67 × 10−5 S/cm has been found for sample PVA-PVP-PEG-20MeSO4Na at room temperature. AC conductivity vs. frequency (Hz) curves was obtained for different PVA-PVP based polymer blend with respect to salt concentrations and temperatures. Dielectric permittivity and electric modulus of the polymeric films have been studied for various frequencies. Scaling i.e. σ/σ0 vs. ω/ωo has been done for PVA-PVP-PEG-20MeSO4Na polymer blend electrolyte.