Patent ID: 7862923

Claim:
A proton exchange membrane having a proton exchange membrane polymer consisting of: a main chain, and one or more branch chains directly connected to said main chain wherein the chemical formula for at least one of said branch chains is where n is an integer; said main chain is a first polymer selected from the group consisting of: aliphatic polymers, aliphatic block polymers, and aliphatic random copolymers; said main chain is connected at one of the chemical bonds of the benzene ring of said branch chains; and the â€”(CH 2 ) n â€”SO 3 H radical in said at least one of the branch chains is connected to the benzene ring in said at least one of the branch chains at one of the following positions, including a para-position, a meta-position, and an ortho-position, of the chemical bond of the benzene ring in said at least one of the branch chains that connects to said main chain.