Investigation of microstructure and conducting mechanism of nanocomposite polymeric electrolytes with rectorite clay by PALS

16th International Conference on Positron Annihilation

Gao, S.^1 ; Gong, J.^1 ; Yan, X.L.^1 ; Xue, G.B.^1 ; Zhong, J.^1 ; Wang, B.^1

Department of Physics, Key Laboratory of Nuclear Solid State Physics, Wuhan University, Wuhan, 430072, China^1

关键词: Conducting mechanism;    Fractional free volume;    Free-volume theory;    Polymeric electrolytes;    Positron annihilation lifetimes;    Structural transitions;    Volume transport;    Williams-Landel-Ferry equations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012049/pdf
DOI  :  10.1088/1742-6596/443/1/012049

来源: IOP

【 摘 要 】

Polymeric electrolytes with different modified organic nanoretorite (OREC) content have been prepared. Measurements of the structural transition, the positron annihilation lifetime, free volume and ionic conductivity as a function of the OREC content and the temperature have been performed. According to the variations of the ortho-positronium (o-Ps) lifetimes with temperature, the glass transition temperatures have been determined. A direct relationship between the ionic conductivity and the fractional free volume has been established using based on free volume theory Williams-Landel-Ferry (WLF)equations, implying a free-volume transport mechanism. Our experimental results indicated that the segmental chain motion and ionic migration and diffusion could be explained by the free volume theory.