IONIC-CONDUCTION IN POLYPHOSPHAZENE CONTAINING OLIGO(OXYETHYLENE) SIDE-CHAINS WITH CYCLIC CARBONATE AS TERMINAL GROUPS

Novel comb-type polyphosphazene derivatives with cyclic carbonate grou ps as the terminal function of oligo(oxyethylene) side chains [CEP] we re prepared for the achievement of high ionic conductivity, when they were hybridized with LiClO4, in accordance with increase of permittivi ty. The relative permittivity of CEP turned out to be extraordinarily high, i.e. 24,6, whereas that of a similar comb-type polyphosphazene w ith methyl ether terminal function of side chains was less than 10 at 25-degrees-C. The [LiClO4 (5)/CEP (95 wt.-%)] hybrid showed relatively high ionic conductivity of 7,3 . 10(-6) at 25-degrees-C and 9,6 . 10( -5) S . cm-1 at 60-degrees-C, respectively. From the observation of th e temperature dependence of ionic conductivity at 10-60-degrees-C, it was revealed that the ionic conduction obeys the Vogel-Tamman-Fulcher and Williams-Landel-Ferry equations based on the free volume theory.