Functionalization of Poly(Ether Ether Ketone)with Imidazole Groups Catalyzed by Superacid
Polymers containg imidazole units have been attracting extensive attention as ion exchange membrane materials for acidic/alkaline fuel cells.However,modification methods capable of directly introducing imidazole groups onto aromatic polymers are scarce.Herein,a novel modification method,termed"imidazolemethylation"and catalyzed by a superacid,has been proposed.This method is exemplified by the modification of commercial poly(ether ether ketone)(PEEK)using two types of commercial imidazoles,each containing one hydroxymethyl group.1H NMR confirmed that the modification proceeded via Friedel-Crafts alkylation reaction between the hydroxymethyl group of the imidazoles and the electron-rich arenes of PEEK,and was completed quantitatively under the catalysis of the superacid trifluoromethanesulfonic acid(TFSA).
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