Abstract

New copolyesters of thiodipropionic acid and triethylene glycol containing various amounts of -SO 3Na groups were developed. Both these copolymers and their electrolytes, the latter obtained by dissolving NaClo 4 in the polymeric matrix, were characterized in terms of ionic conductivity in the 25–80 °C temperature range to evaluate the effect on conductivity of ionic groups covalently attached to the polymer backbone. A small number of -SO 3Na groups were found to improve the electrical properties of the copolymers, even though the conductivity values were not high enough to allow their use in electrochemical devices without further dissolution of sodium salt. On the other hand, a large content of sulfonate groups increases significantly the viscosity of the copolymeric matrix and reduces the electrical performances of the electrolytes.

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