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Novel cross-linked hydroxide conductive poly(phthalazinone ether ketone) (PPEK) membranes were prepared via chloromethylation,quaternization,casting membrane and cross-linking reactions,followed by the hydroxide ionic exchange in 1M KOH of quaternized poly(phthalazinone ether ketone) membranes.The chloromethylated PPEK in NMP was quaternized with triethylamine (TEA) separately as ammonium agents,and then the 1,4-dimethylpiperazine (DMP) of six-membered cyclic tertiary amine was introduced as cross-linked agent.