Patent ID: 8101708

Claim:
A polymer corresponding to the formula: wherein R 1 and R 2 are aromatic organic groups and X is selected from the group consisting of SO 2 , CO, N═N, O, and CR 7 R 8 , wherein R 7 is H, an organic group and wherein R 8 is independently selected from the group consisting of H, and an organic group, wherein R 3 is selected from the group consisting of NO 2 , O and H, wherein R 4 is selected from the group consisting of a sulfonate group, H, NO 2 and NH 2 , wherein R 5 is selected from the group consisting of NO 2 and NH 2 , wherein R 6 is selected from the group consisting of NO 2 and NH 2 and wherein n is greater than about twenty.