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The Brønsted acid–base polymer electrolyte membrane was prepared by entrapping imidazole in sulfonated poly(phenylene oxide) at the molar ratio of Im/SPPO=2:1. The hybrid showed a high thermal stability up to 200°C and peroxide tolerance. Differential scanning calorimetry shows that glass transition temperature is 232°C. The conductivity increases with temperature exceeding 10 −3 S/cm above...