Patent ID: 7727653

Claim:
A polymer electrolyte membrane comprising a compound represented by formula 1a or formula 1b and doped with at least one acid, where R 1 and R 2 are each independently a hydrogen atom, a C 1-40 alkyl group, a C 6-20 aryl group, a C 1-10 alkoxy group, a C 7-40 alkylaryl group, a C 7-40 arylalkyl group, a C 2-20 alkenyl group, a C 8-40 arylalkenyl, a C 2-10 alkynyl, a hydroxyl group, a nitro group, or an amino group; and n is an integer between 10 and 100,000, wherein a doping level of the acid is in the range of 600 to 6000%.