| abstract |
A copolymer comprising a repeating unit of the following formula (I) and at least one additional repeating unit: (I) In this formula, Ar 1 and Ar 2 are each independently selected from aryl and heteroaryl, unsubstituted or substituted with one or more substituents; Each R is independently a substituent; n is each independently 0, 1 or 2; m is each independently 0, 1, 2 or 3; At least one of the repeating units of the polymer is a partially conjugated repeating unit. |