Patent ID: 8575477

Claim:
A polymer comprising a structure represented by: wherein R 1 and R 2 are independently selected from a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heteroaryl group; Ar 1 and Ar 2 are independently an aromatic or heteroaromatic group comprising about 4 to about 30 carbon atoms, and can be optionally substituted; Ar 3 and Ar 4 are independently an aromatic or heteroaromatic group comprising about 4 to about 20 carbon atoms, and can be optionally substituted; a and b are independently an integer from about 1 to about 4; c and d are independently an integer from about 0 to about 2; R 3 , R 4 , R 5 , and R 6 , are independently selected from a substituted or unsubstituted alkyl group, an alkoxy group, a cyano, or a halogen; and n represents a number from about 2 to about 5,000.