Zwitterion-functionalized block copolymer membranes and associated block copolymer composition

A block copolymer, comprising at least one block A comprising structural units having a formula (I), and at least one block B comprising structural units having a formula (II):

• (II)
• wherein “a” and “b” are independently at each occurrence 0, 1, 2, 3, or 4;
• “n”, “p”, “q” and “r” are independently 0 or 1;
• R1 and R2 are independently at each occurrence a halogen atom, a nitro group, a C1-C12 aliphatic radical, a C3-C12 cycloaliphatic radical, or a C3-C12 aromatic radical;
• R3 is a C1-C12 aliphatic radical, a C3-C12 cycloaliphatic radical, or a C3-C12 aromatic radical;
• R4 is a C1-C12 aliphatic radical, a C3-C12 cycloaliphatic radical, or a C3-C12 aromatic radical;
• Y is independently at each occurrence a bond, an oxygen atom, a sulfur atom, a sulfinyl group, a sulfonyl group, a phenylphosphine group, a C1-C12 aliphatic radical, a C3-C12 cycloaliphatic radical, or a C3-C12 aromatic radical;
• Q is a bond, an oxygen atom, a sulfur atom, a C1-C12 aliphatic radical, a C3-C12 cycloaliphatic radical, or a C3-C12 aromatic radical;
• and
• Z is a zwitterion functional group.