Block copolymer, ion-exchange membrane and method of preparing block copolymer

An ion conductive block copolymer comprising:

• a hydrophobic repeating unit represented by Formula 1 below;
• and
• a hydrophilic repeating unit represented by Formula 3 below:
• wherein in Formulae 1 and 3,
• Ar1 is an aromatic group including a single benzene ring or at least two benzene rings, the at least two benzene rings are directly connected to each other or are bonded to each other through a linking group selected from —O—, —S—, —S(O2)—, —(C(O))—, —(CF2)n—, —C(CH3)2—, —C(CF3)2—, an imide bond, an ether imide bond, phosphine, imidazole, or —(CH2)n— in which n is an integer of 1 to 10, each of the benzene rings is unsubstituted or substituted with —COR1 or —CN, and R1 is an aromatic group including at least one benzene ring;
• Ar′2 is an aromatic group including a single benzene ring or at least two benzene rings substituted with —COR4, R4 or both, and R4 is selected from the group consisting of high-density functional groups FG represented by:
• wherein M is alkali metal, X is a negative ion of OH−, and n is a rational number of 1 to 20, and R5 through R7 are the same as or different from each other and are C1 to C6 alkyl, cyclohexane or benzyl;
• Ar3 and Ar′3 are each independently an aromatic group including a single benzene ring or at least two benzene rings, the at least two benzene rings are directly connected to each other or are bonded to each other through a linking group selected from —O—, —S—, —S(O2)—, —(C(O))—, —C(CH3)2—, —(CH2)n—, —C(CF3)2—, or —(CF2)n— in which n is an integer of 1 to 10, and each of the benzene rings is unsubstituted or substituted with a halogen ion, or —(CH2)nCH3 in which n is an integer of 0 to 6;
• Ar4 and Ar′4 are the same as or different from each other and are
• wherein n is an integer of 1 or 2, and two of Ra through Rd are connected to a main chain of the block copolymer and the rest are the same as or different from each other and are hydrogen, benzene or alkyl;
• A is —O—, —S—, or —S(O2)—;
• z is an integer of 0 or 1;
• and
• x and y are each independently an integer of 1 to 100,
• n and m are each independently an integer of 1 to 1000.