Highly Efficient\nSynthesis of Alkyl-Linked Poly(arylene\nalkylene) Anion Exchange Membranes via Postfunctionalization Integrated\nwith Olefin Hydroboration and Suzuki Coupling Reaction

Postfunctionalization\nof poly(arylene alkylene) offers a simple\nand effective strategy to prepare robust anion exchange membranes\n(AEMs). The introduction of extended alkyl spacers not only enhances\nthe chemical stability but also promotes the formation of microphase\nseparation. Herein, we report a novel postfunctionalization approach\nthat integrates alkyl linkers onto the poly(arylene alkylene) backbone\nthrough a one-pot reaction combining olefin hydroboration with Suzuki\ncoupling. This methodology demonstrates exceptional reactivity and\nensures complete functionalization with 100% efficiency while eliminating\nthe need for complex monomer synthesis or purification. Two AEMs with\ndications were subsequently prepared via the Menshutkin reaction.\nThese AEMs exhibit distinct phase separation structures, ultrahigh\nOH<sup>–</sup> conductivity, excellent alkaline stability,\nand superior performance in anion exchange membrane water electrolysis.\nThis study presents a viable postfunctionalization strategy for developing\nhigh-performance AEMs and is expected to provide new insights into\npolymer chemistry and functional materials design.