Block copolymers including poly(phenylene) and methods thereof

A composition comprising a structure having the formula (IVa):

• or a salt thereof, wherein:
• each R1 and R3 is, independently, H, halo, optionally substituted C1-12 alkyl, optionally substituted C1-12 haloalkyl, optionally substituted C1-12 perfluoroalkyl, optionally substituted C1-12 heteroalkyl, RS, RP, RC, or RF, wherein RS is an acidic moiety comprising a sulfonyl group, RP is an acidic moiety comprising a phosphoryl group, RC is an acidic moiety comprising a carbonyl group, and RF is an electron-withdrawing moiety;
• each ArL and RM is, independently, a bivalent linker comprising optionally substituted arylene;
• each ArP comprises an optionally substituted arylene or is a covalent bond;
• each ArN comprises an optionally substituted arylene;
• each q is, independently, an integer of from 1 to 5;
• each m and n is, independently, an integer of from about 1 to 1000, each L1 is, independently, selected from the group consisting of:
• or a salt thereof;
• each L2 is, independently, selected from the group consisting of:
• or a salt thereof;
• wherein each RT is, independently, H, halo, optionally substituted C1-12 alkyl, optionally substituted C1-12 alkoxy, RS, RP, RC, or RF;
• wherein each t is, independently, an integer of from 1 to 4;
• wherein each L1a, L1b, L1c, L2a, L2b, L2c, and L3 is, independently, a covalent bond, carbonyl, oxy, thio, azo, phosphonoyl, phosphoryl, sulfonyl, sulfinyl, sulfonamide, imino, imine, phosphine, nitrilo, optionally substituted C1-12 alkylene, optionally substituted C1-12 alkyleneoxy, optionally substituted C1-12 heteroalkylene, optionally substituted C1-12 heteroalkyleneoxy, optionally substituted C4-18 arylene, or optionally substituted C4-18 aryleneoxy;
• wherein each of m1 and m2 is, independently, an integer of from 1 to 10;
• and
• wherein at least one of L1a and/or L2a is not a covalent bond.