A microporous polyimide plasticizing gas separation membrane containing symmetric bis-benzimidazole and a preparation method thereof

CN122145797APending Publication Date: 2026-06-05TIANJIN POLYTECHNIC UNIV +1
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Patent Information

Application Number
CN202610258899.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-04
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Conventional polyimide gas separation membranes are prone to plasticization when handling high-pressure or highly adsorbent gases, resulting in increased permeability but significantly reduced gas selectivity, which limits their industrial applications.

Method used

A method for preparing microporous polyimide gas separation membranes with symmetrical bisbenzimidazole groups is proposed. This method involves reacting a diamine monomer containing symmetrical bisbenzimidazole groups with an anhydride monomer containing pore-forming units to form hydrogen bonds and π-π stacking, thereby enhancing the rigidity between molecular chains. A copolymerization strategy is then used to regulate the membrane performance.

Benefits of technology

It significantly improves the resistance to plasticization, enhances the selectivity and mechanical properties of the gas separation membrane, enabling it to operate stably under high pressure conditions and with flexible and adjustable performance.

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Abstract

The application discloses a kind of microporous polyimide anti-plasticizing gas separation membranes containing symmetric double benzimidazole and a preparation method thereof, belong to the technical field of polymer materials.The technical scheme includes that diamine monomer containing symmetric double benzimidazole group is dissolved in solvent, then acid anhydride monomer with porogenic element is added in batches, polyamic acid membrane is obtained by scraping after reaction, then imidization is carried out to obtain polyimide gas separation membrane containing symmetric double benzimidazole group.The application is applied to high-pressure or high-absorptive gas separation aspect, solves the problem that conventional polyimide gas separation membrane is easy to plasticize, can simultaneously improve gas separation performance and anti-plasticizing property.
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Citation Information

Patent Citations

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