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A well‐designed architecture is presented here to construct high‐performance anion exchange membranes (AEMs). A series of quaternized fluorene‐containing block poly(arylene ether sulfone ketone)s (QFPESK‐m‐n) is synthesized as the main chains, and grafted with comb‐shaped C8 long alkyl chains for the AEMs. By varying the hydrophilic segment’ length, there has been a significant change in the microstructure...