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Influence of Grain Size to Phase Transitions in Nanocomposites and Polymer Electrolytes via SAXS/DSC and Impedance Spectroscopy Studies

(PEO)8ZnCl2 polymer electrolytes and nanocomposites were prepared using PEO g-irradiated to selected dose of 309 kGy and TiO2 nanograins. The influence of added nanosize TiO2 grains to polymer electrolytes and the effect of g-radiation from a Co-60 source were studied by small-angle X-ray scattering (SAXS) simultaneously recorded with differential scanning calorimetry (DSC) at synchrotron ELETTRA. Impedance spectroscopy (IS) was also performed. Above-mentioned treatments largely enhanced the conductivity of polymer electrolyte. Room temperature conductivity increase up to two orders of magnitude was achieved. We observed changes between 293 K and 373 K for treated and as prepared polymer electrolyte in SAXS and DSC spectra and during the phase transition to the superionic phase at 335 K. The crystallinity significantly decreased with radiation dose increase due to crosslinking of PEO. As well, cohesion and elasticity of irradiated polymer film changed. The addition of nanograins increased the conductivity more than can be ascribed to the changes in crystallinity possibly because of interactions of anions with nanograins. It is observed that the brittleness of the g-irradiated electrolyte was also reduced by nanograins.

SAXS; DSC; polymer electrolytes

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