  The present paper report is focused toward the preparation of the flexible
and freestanding blend solid polymer electrolyte films based on PEO-PVP
complexed with NaPF6 by solution cast technique. The structural/morphological
features of the synthesized polymer nanocomposite films have been investigated
in detail using X-ray diffraction, Fourier transform infra-red spectroscopy,
field emission scanning electron microscope, and atomic force microscopy
techniques. The film PEO-PVP+NaPF6 O/Na:8 exhibits highest ionic conductivity
~5.92x10-6 S cm-1 at 40 oC and ~2.46x10-4 S cm-1 at 100 oC. The temperature
dependent conductivity shows Arrhenius type behavior and activation energy
decreases with the addition of salt. The high temperature (100 oC) conductivity
monitoring is done for the optimized PEO-PVP+NaPF6 O/Na:8 highly conductive
system and the conductivity is still maintained stable up to 160 h (approx. 7
days). The thermal transitions parameters were measured by the differential
scanning calorimetry (DSC) measurements. The prepared polymer electrolyte film
displays the smoother surface in addition of salt and a thermal stability up to
300 oC............
