High Pressure Conductivity and NMR Investigation of Siloxane-Based Polymer Electrolytes

Abstract Variable temperature and pressure conductivity and 23Na nuclear magnetic resonance (NMR) measurements of several siloxane-based polymers complexed with NaCF3SO3 are reported. The conductivity exhibits V.T.F. behavior of the type commonly observed in amorphous polymer electrolytes, and activation volumes (29.9 cm3/mol at 313K for one sample) typical of these materials. The NMR linewidths associated with mobile Na+ ions exhibit motional narrowing above Tg in a manner similar to other Na-polymer electrolytes. The pressure dependence of the 23Na linewidth is consistent with a 10-15 K/kbar increase in Tg.