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.‐%.magnified image
Front Cover: The cover illustrates a strategy for a simple preparation of the proton conductive composite membrane composed of poly(2,5-benzimidazole) and zirconium pyrophosphate via a PPA direct casting method. The SEM image shows the zirconium pyrophosphate particles in the composite membrane when the content of the zirconium pyrophosphate is about 30 wt.-%. Further details can be found in the article by T
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