Patent ID: 8883958

Claim:
A polymer comprising a repeating unit (M 1a ) having a formula selected from: or a repeating unit (M 1b ) having a formula selected from: wherein: Ar 1 and Ar 2 independently are an optionally substituted C 6-14 aryl group or an optionally substituted 5-14 membered heteroaryl group; Ar 3 and Ar 4 independently are an optionally substituted 5- or 6-membered heteroaryl group; L, at each occurrence, independently is selected from —O—, —S—, —Se—, —OC(O)—, —C(O)O—, a divalent C 1-20 alkyl group, a divalent C 1-20 haloalkyl group, and a covalent bond; L 1 , at each occurrence, independently is selected from —O—, —S—, —Se—, —OC(O)—, —C(O)O—, a divalent C 1-20 alkyl group, and a divalent C 1-20 haloalkyl group; U and U′ independently are selected from O, S, and Se; V and V′ independently are CR or N; W, at each occurrence, independently is selected from O, S, and Se; W′, at each occurrence, independently is CR or N; R, at each occurrence, independently is selected from H, F, Cl, —CN, and L′R′, wherein L′, at each occurrence, is selected from —O—, —S—, —Se—, —C(O)—, —OC(O)—, —C(O)O—, and a covalent bond; and R′, at each occurrence, independently is selected from a C 1-40 alkyl group, a C 2-40 alkenyl group, a C 2-40 alkynyl group, and a C 1-40 haloalkyl group; and the polymer has a degree of polymerization in the range of 3 to 10,000.