CONTRASTING CONDUCTANCE-VISCOSITY RELATIONS IN LIQUID STATES OF VITREOUS AND POLYMER SOLID ELECTROLYTES

In order to contrast conductivity mechanisms in fast ion glassy and rubbery polymer electrolytes, the liquid states of two prototypical cases have been studied. Viscosity and conductivity measurements have been performed on molten (as opposed to glassy) (AgCl)//0//. //3//5-(AgI)//0//. //4//5-(CsCl)//0//. //2//0 and on solutions of sodium triflate in low molecular weight poly(propylene oxide), PPO (as opposed to high molecular weight, 10**6, rubbery solid PPO). Both types of systems show non-Arrhenius viscosity with divergent behavior near T//g. The energetics of the conductivity processes, however, are very different. This is emphasized by reduced temperature scale (T/T//g) plotting of (temperature-dependent) activation energies.