Patent ID: 8110636

Claim:
A method of synthesizing a multi-block sulfonated Diels Alder poly(phenylene) copolymer, comprising, in the order listed: a) synthesizing an end-capped, controlled molecular weight DAPP oligomer, having a known repeat unit length= n wherein the end-capping step comprising using an end-cap monomer selected from the group consisting of 3-ethynylanisole, 4-ethynylanisole, 2-ethynylanisole, ethynyl ethoxybenzene, and ethynyl isopropoxybenzene; b) converting the end-cap groups to a reactive functional group; c) linking the DAPP oligomer with a second polymer segment having m repeat units, to make a multi-block copolymer having n and m repeat units; and d) sulfonating the multi-block copolymer by attaching acid groups onto only the DAPP repeat units, thereby producing a multi-block sulfonated Diels Alder poly(phenylene) copolymer having both hydrophobic and hydrophilic segments.