• Pure poly(ethylene oxide) (PEO) in the form of dry powder, film and aqueous solution, were exposed to as the mixture of composition PEO20LiClO4 in form of dry film and aqueous solution, were exposed to γ-radiation at room temperature. Changes in thermal and electrical behaviour due to introduction of crosslinks were evaluated. Moreover, the mechanisms of radiolytic degradation and crosslinking of PEO in the solid state and in aqueous solution are discussed on the basis of results of ESR measurements. The decrease in crystallinity, the improved mechanical properties and higher conductivity near room temperature in the materials prepared from aqueous solution allow one to confirm that γ-irradiation can be a simple and effective route to obtain highly conductive and mechanically stable polymer electrolytes.
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