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A series of ion conducting, thin-film polymer electrolytes, based on poly(acrylonitrile), tetraethylammonium tetrafluoroborate and sulpholane (tetramethylene sulphone, TMS), PAN-(C 2 H 5 ) 4 NBF 4 -TMS, were prepared using the casting technique. The polymer electrolytes were transparent with rubberlike elasticity. Maximum conductivity was at the level of 10 mS/cm at...