A low-swelling crosslinked poly(arylene-quinoxium salt) anion exchange membrane and a method of making the same

By crosslinking halogenated poly(arylene-alkylene) polymers with poly(arylene-quinine) and combining them with a porous substrate, a low-swelling crosslinked poly(arylene-quinine salt) anion exchange membrane was prepared. This solved the problems of high swelling rate and poor mechanical properties of the membrane in water, and achieved high alkalinity stability and improved strength, making it suitable for applications such as fuel cells.

CN122103642APending Publication Date: 2026-05-29HEFEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEFEI UNIV OF TECH
Filing Date
2026-03-05
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing poly(arylene-quinine salt) anion exchange membranes have excessively high swelling rates in water, resulting in deteriorated mechanical properties and making it difficult to operate stably in electrolyzers for extended periods. Furthermore, they are prone to degradation under high-temperature and strong alkaline conditions.

Method used

A low-swelling cross-linked poly(arylene-alkylene) anion exchange membrane was prepared by using halogenated poly(arylene-quinine) polymers as macromolecular cross-linking agents to chemically cross-link with poly(arylene-quinine) and combining them with a porous substrate.

Benefits of technology

It improves the membrane's anti-swelling properties and mechanical strength, maintains excellent alkali stability, enhances gas barrier properties, and is suitable for electrochemical energy conversion fields such as fuel cells and water electrolysis.

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Abstract

The present application relates to ion exchange membrane technical field, particularly to a kind of low swelling crosslinked poly (arylene-quininium salt) anion exchange membrane and preparation method thereof.Poly (arylene-quininium) polymer is dissolved in first organic solvent, and halogenated poly (arylene-alkylene) polymer is added as macromolecular ionization reagent, and quininium group in partially ionized poly (arylene-quininium) polymer is then added with excess small molecule ionization reagent to make quininium group completely ionized, to obtain crosslinked poly (arylene-quininium salt) polymer solution.The obtained crosslinked poly (arylene-quininium salt) polymer solution is added to first precipitant to obtain crosslinked poly (arylene-quininium salt) polymer powder, and it is dissolved in second organic solvent to obtain polymer solution, coated on homogeneous substrate or porous substrate, dried to obtain low swelling crosslinked poly (arylene-quininium salt) anion exchange membrane.The present application uses halogenated poly (arylene-alkylene) as macromolecular crosslinking agent to construct crosslinked network in poly (arylene-quininium salt) ion polymer, so that the obtained crosslinked poly (arylene-quininium salt) anion exchange membrane shows low swelling, high mechanical strength, high alkali resistance and outstanding gas barrier property.
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