Block copolymer

A block copolymer comprising a first block and a second block having a different chemical structure from the first block, wherein the first block exhibits a melting transition peak or an isotropic transition peak in a range from −80° C. to 200° C. in differential scanning calorimetry (DSC) analysis and wherein the first block comprises an aromatic structure that does not have halogen atom and the second block comprises an aromatic structure having halogen atom.

A block copolymer comprising a first block and a second block having a different chemical structure from the first block, wherein the first block exhibits a melting transition peak or an isotropic transition peak in a range from −80° C. to 200° C. in differential scanning calorimetry (DSC) analysis and wherein the first block comprises a unit represented by Formula 1 below:

• wherein, R is a hydrogen or an alkyl group having 1 to 4 carbon atom(s), X is a single bond, an oxygen atom, a sulfur atom, —S(═O)2—, a carbonyl group, an alkylene group, an alkenylene group, an alkynylene group, —C(═O)—X1— or —X1—C(═O)—, where the X1 is an oxygen atom, a sulfur atom, —S(═O)2—, an alkylene group, an alkenylene group or an alkynylene group, and Y is a monovalent substituent including a ring structure to which the side chain having 8 or more chain-forming atoms is linked.