1. School of Chemical and Biological Engineering, Seoul National University, Seoul 151‐744, South Korea;2. School of Chemical and Biological Engineering, Seoul National University, Seoul 151‐744, South KoreaSchool of Chemical and Biological Engineering, Seoul National University, Seoul 151‐744, South Korea. Fax: +82 2 880 8899
Abstract:
Zirconium pyrophosphate (ZPP)/poly(2,5‐benzimidazole) composites were prepared by polymerization of 3,4‐diaminobenzoic acid with zirconium hydrogen phosphate in polyphosphoric acid. The composite membranes for polymer electrolyte membranes were prepared by casting the polymerization solutions directly onto stainless steel plates. Membranes doped in 60 wt.‐% phosphoric acid solution had high proton conductivity values of more than 0.12 S · cm?1 (at 180 °C and 1% RH). Physical properties of the doped membranes, including the mechanical strength and dimensional stability, improved as ZPP content in the composites increased to 10–20 wt.‐%.
