The charge density plays a very important role in our system. To increase the charge density, we designed a monomer containing hexaphenylbenzene that can be highly sulfonated. The PAEK-HS was synthesized by an aromatic nucleophilic substitution polymerization reaction. Carbonyl, a strong electron-withdrawing group, was introduced to activate the aromatic dihalides. In addition, we built an aliphatic bridge between the hydrophobic main chain and hydrophilic sulfonated hexaphenylbenzene to increase the flexibility of side chains, which is more advantageous for the phase separation. The PAEK-HS with different proportions of hexaphenylbenzene could be synthesized by controlling the rate of the monomer accurately.

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