Preparation method of high-flux monovalent selective double-sided chain type anion exchange membrane

By introducing isobenzofuranone and benzimidazole structures onto the polyarylethersulfone backbone, micropores and microphase separation are formed, solving the problems of low ion selectivity and power generation efficiency in reverse electrodialysis technology, and realizing the selective transport and mechanical stability of high-throughput monovalent anions.

CN116510517BActive Publication Date: 2026-02-10ZHEJIANG UNIV OF TECH +1
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Patent Information

Application Number
CN202310449368.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-21
Publication Date
2026-02-10
Estimated Expiration
2043-04-21

AI Technical Summary

Technical Problem

Existing reverse electrodialysis technologies suffer from poor ion selectivity, low power generation efficiency, and insufficient membrane mechanical strength and swelling resistance, making it difficult to meet the demand for high-throughput, low-cost selectivity.

Method used

Isobenzofuranone and rigid benzimidazole structures are introduced onto the polyarylethersulfone backbone. Micropores are formed through long side chains and twisted folding structures to construct an anion exchange membrane with high permeability and selectivity. The microphase separation of hydrophobic and hydrophilic segments forms an ion transport channel of appropriate size.

Benefits of technology

It enables selective transport of high-flux monovalent anions, improves the mechanical stability and conductivity of the membrane, reduces the ion conduction resistance within the membrane, and enhances power generation efficiency.

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Abstract

The application relates to the field of polymer high molecular materials, and particularly discloses a preparation method of a high-flux monovalent selective double-side chain type anion exchange membrane. In the preparation method, under the condition of ensuring the proper selectivity of an ion membrane, isophthaldehyde ketone structure and rigid benzimidazole structure are introduced into a polyarylene ether sulfone main chain, long side chains, twisted folding structures and rigid structures are utilized, the intermolecular stacking is prevented, the structure relaxation and the loss of micropores are prevented, free volumes are generated in the polymer membrane, micropore channels (ion channels) are formed, the high-efficiency transmission of monovalent ions is promoted, and a kind of ion exchange membrane with stable structure, high permeation flux and selectivity is constructed.
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