| abstract |
A polymer useful in an optoelectronic device comprises structural unit of formula I: wherein Ar is heteroaryl or aryl, other than formula I; R1, R2, R3 and R4 are, independently at each occurrence, a C1-C20 aliphatic radical, a C3-C20 aromatic radical, or a C3-C20 cycloaliphatic radical; a, c and d are, independently at each occurrence, an integer ranging from 0-4; b is an integer ranging from 0-3; and n is an integer greater than 3. |