Bisamine anion exchange membranes without beta-h and methods of making and using the same
By preparing anion exchange membranes using β-H-free diamine crosslinking agents, the problem of structural damage to anion exchange membranes in strongly alkaline environments was solved, resulting in improved mechanical properties and chemical stability, reduced swelling ratio, and stable conductivity.
CN122277833APending Publication Date: 2026-06-26XIAMEN UNIV
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIAMEN UNIV
- Filing Date
- 2026-04-07
- Publication Date
- 2026-06-26
AI Technical Summary
Technical Problem
Existing anion exchange membranes are prone to Hofmann elimination reactions in strongly alkaline environments, leading to membrane structure damage, poor mechanical strength and chemical stability, and severe swelling problems.
Method used
Anion exchange membranes are prepared by using a β-H-free diamine crosslinking agent to form a crosslinking network through a nucleophilic substitution reaction, thus avoiding the occurrence of Hofmann elimination reaction and improving mechanical properties and chemical stability.
Benefits of technology
It remains stable in a strongly alkaline environment for a long time, with significantly improved mechanical and chemical properties, reduced swelling rate, stable electrical conductivity, and increased mechanical strength.
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Figure CN122277833A_ABST
Abstract
This invention relates to the field of polymer materials technology, specifically providing a β-H-free diamine-based anion exchange membrane, its preparation method, and its application. The preparation method includes: (1) reacting aryl monomers and ketone-aldehyde monomers under the action of a Lewis acid to obtain a biphenylfluoroketone resin; (2) reacting the biphenylfluoroketone resin with a β-H-free crosslinking agent, adding functionalized monomers, and then ion exchanging the mixture to obtain the anion exchange membrane shown in formula (I). This invention utilizes the nucleophilic substitution reaction between the amino groups on both sides of the β-H-free diamine-based crosslinking agent and the haloalkyl groups, ensuring that the prepared anion exchange membrane has a low swelling ratio while further improving dimensional stability, mechanical properties, and chemical stability. (I)
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