A solid polymer electrolyte includes a polymer having a sulfonic group and shows high proton conductivity in a wide range of temperatures and humidities and is excellent in hot water resistance and chemical stability. A proton conductive membrane is compos...

An object of the present invention is to provide a proton conducting polymer membrane that has excellent mechanical properties and high methanol barrier properties, in addition to high proton conductivity, and is useful as an electrolyte in polymer electro...

A proton conductive composition comprises a heteropolyacid and a polyarylene having a sulfonic group. The composition has good water resistance and toughness, and shows an excellent proton conductivity without any treatment to increase the acid concentrati...