Highly Efficient Synthesis of Alkyl-Linked Poly(arylene alkylene) Anion Exchange Membranes via Postfunctionalization Integrated with Olefin Hydroboration and Suzuki Coupling Reaction

Postfunctionalization of poly(arylene alkylene) offers a simple and effective strategy to prepare robust anion exchange membranes (AEMs). The introduction of extended alkyl spacers not only enhances the chemical stability but also promotes the formation of microphase separation. Herein, we report a novel postfunctionalization approach that integrates alkyl linkers onto the poly(arylene alkylene) backbone through a one-pot reaction combining olefin hydroboration with Suzuki coupling. This methodology demonstrates exceptional reactivity and ensures complete functionalization with 100% efficiency while eliminating the need for complex monomer synthesis or purification. Two AEMs with dications were subsequently prepared via the Menshutkin reaction. These AEMs exhibit distinct phase separation structures, ultrahigh OH^– conductivity, excellent alkaline stability, and superior performance in anion exchange membrane water electrolysis. This study presents a viable postfunctionalization strategy for developing high-performance AEMs and is expected to provide new insights into polymer chemistry and functional materials design.