Ionic conductivity of polyether‐polyurethane networks containing NaBPh₄: A free volume analysis

Abstract

Abstract The ionic conductivity of polyoxyethylene‐ and polyoxypropylene‐polyurethane networks containing sodium tetraphenylborate was studied as a function of temperature and salt concentration. The results can be rationalised in terms of free volume considerations. The fact that the WLF equation applies to the conductivity of these materials demonstrates that there exists a direct relationship between the ion conduction process and the viscoelastic properties of the networks.