| abstract |
A polymer comprising repeat units of the formula: n n nwherein R 1 is independently in each occurrence C 1-20 hydrocarbyl or C1-20 hydrocarbyl containing one or more heteroatoms of S, N, O, P or Si or both R 1 may form, with the 9-carbon of the fluorene ring, a C 5-20 ring structure containing one or more heteroatoms of S, N, or O; R 2 is independently in each occurrence C 1-20 hydrocarbyl, C 1-20 hydrocarbyloxy, C 1-20 thioether, C 1-20 hydrocarbyloxycarbonyl, hydrocarbylcarbonyloxy, or cyano; a is independently in each occurrence a number from about 0 to about 1;n m is a number from about 1 to about 2; and n is a number from about 3 or greater. |