engleski

SAXS/DSC/WAXD study of the effect of γ- radiation on nano-polymer electrolyte

(PEO)8ZnCl2 polymer electrolytes and nano-composites were prepared using PEO gamma-irradiated to selected dose of 529 kGy and with addition of 10% of TiO2 nanograins. The influence of added nanosize TiO2 grains to polymer electrolytes and the effect of gamma-radiation from a Co-60 source were studied by small-angle X-ray scattering (SAXS) simultaneously recorded with differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) at synchrotron ELETTRA. Infrared (IR) and impedance spectroscopy (IS) were also performed (1). We observed changes between 293 K and 373 K for treated and as prepared polymer electrolyte in SAXS, DSC and WAXD spectra and during the phase transition to the superionic phase at 335 K (2, 3). Above-mentioned treatments largely enhanced the conductivity of polymer electrolyte. Room temperature conductivity increase up to two orders of magnitude was achieved. The crystallinity significantly decreased with radiation dose increase due to crosslinking of PEO. As well, cohesion and elasticity of irradiated polymer film changed. Addition of nanograins increased conductivity more than can be ascribed to crystallinity possibly because of interactions of anion with nanograins. We have studied influence of different heating and cooling rates to the grain sizes and temperature of the phase transition. References [1] A. Turković, M. Pavlović, P. Dubček, M. Lučić-Lavčević, B. Etlinger, S. Bernstorff, SAXS/DSC Study of Polymer Electrolyte for Zn Rechargeable Nanostructured Galvanic Cells. 2007 J. of Electrochemical Society 154 (6) 554-560. and ibid. 2007 Virtual Journal of Nanoscale Science & Technology 15/ 17 ; 554-560. [2] A. Turković, M. Pavlović, P. Dubček, S. Bernstorff, SAXS/WAXD/DSC Study of Zn2+ Conducting Polymer Electrolyte. 2008 Acta Chim. Slov. 55 822-827. [3] A. Turković, M. Rakić, P. Dubček, M. Lučić-Lavčević, S. Bernstorff, SAXS/WAXS/DSC Study of Temperature Evolution in Nanopolymer Electrolyte 2009 Vacuum in press..

SAXS/DSC/WAXD; Nanocomposite polymer electrolytes; nanostructured metal oxide films

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