Patent ID: 8119833

Claim:
A polymer electrolyte membrane comprising: a dendrimer solid acid of the following formula and 3 H, —COOH, —OH, and —OPO(OH) 2 at the terminal of a side chain, wherein the dendrimer solid acid is uniformly distributed through at least one polymer matrix: X E 1 - . . . -E i - . . . -E n ] a where X is a core represented by one of Formula 2 through Formula 17: where each of p and q is independently an integer from 1 to 9, where a is an integer from 1 to 6 corresponding to the number of bonding sites of X, n is an integer from 2 to 6 corresponding to the number of generations of branching units of the dendrimer, each of E 1 through E n−1 is independently selected from the organic groups represented by Formula 18 through Formula 22: and E n is H, —OH, —COOH, —SO 3 H, or —OPO(OH) 2 .