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Some properties of novel polymer electrolytes, based on a styrene-butadiene-styrene ABA block copolymer with pendant short-chain poly(ethy1ene oxide) (PEO), are described. The polymers were combined with lithium trifluoromethanesulfonate in different concentrations to form an ion conducting matrix.The concentration dependence of the conductivity was analyzed by fitting the data to a VTF type equation. Conductivities, typically S cm-' a t ambient temperatures, were obtained by casting films from a selective solvent which favors microphase separation with PEO forming the continuous phase. The dimensional stability of the materials could be improved by adding quantities of polystyrene homopolymer. Providing the polystyrene molecular weight was low, the conductivity was not greatly affected. Ionic conductivity was enhanced by blending the polymeric material with low molecular weight PEO. These blends did not phase separate on a macroscale.

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