| abstract |
A block copolymer comprising two or more blocks of the following formula (1): (in formula (1), Ar represents a conjugated bivalent radical and represents the same bivalent radical in an identical block, and m represents a number of 1 or more representing the number average degree of polymerization of Ar present in a block) in which at least two of several m present in the copolymer represent a number of 5 or more, the radicals Ar in two adjacent blocks in the copolymer are different from each other, and the copolymer has two radicals Ar if it consists of 2 blocks of the formula ( 1), has two or more Ar groups when it consists of 3 blocks of the formula (1), and has four or more Ar groups when it is composed of 4 or more blocks of the formula (1). |