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Multi-quaternary ammonium side long-chain type polysulfone anion exchange membrane and preparation method thereof

An anion-exchange membrane and multi-quaternary ammonium technology, which is applied in the field of preparation of multi-quaternary ammonium side long-chain polysulfone anion-exchange membranes, can solve problems such as mechanical property degradation, excessive hydrophilicity of polymer membranes, and severe membrane swelling, and achieve Good dimensional stability, improved hydroxide conductivity, and excellent performance

Active Publication Date: 2021-10-01
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this approach often results in excessively hydrophilic polymer membranes, which swell violently after imbibing a large amount of water, resulting in a drastic drop in mechanical properties.
At higher temperatures, the polymer film will even dissolve in water, making it difficult to meet the application requirements of fuel cells

Method used

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  • Multi-quaternary ammonium side long-chain type polysulfone anion exchange membrane and preparation method thereof
  • Multi-quaternary ammonium side long-chain type polysulfone anion exchange membrane and preparation method thereof
  • Multi-quaternary ammonium side long-chain type polysulfone anion exchange membrane and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0027] In the preparation method of the multi-quaternary ammonium side long-chain polysulfone anion exchange membrane, step (3) specifically includes: polymers with different branching degrees of side chains are dissolved in the solvent N-methylpyrrolidone, and after being completely dissolved to obtain The film-forming liquid contains about 3% by weight of the polymer in the film-forming liquid. The film-forming solution is cast into a film by a casting method to obtain a side long-chain polysulfone anion exchange membrane containing multiple quaternary ammonium functional groups.

[0028] Preferably, the preparation method of the side long-chain monomer with multiple quaternary ammonium functional groups in step (3) specifically includes: as shown in formula III, stirring and mixing 1,6-dibromohexane and anhydrous diethyl ether as a solvent , drop trimethylamine alcohol solution at 0°C, and the final mixed solution was reacted at room temperature for 36 hours to obtain a mon...

Embodiment 1

[0032] Example 1, preparation of chloromethylated polysulfone (CMPSF):

[0033] (1) Weigh 2g polysulfone (PSF) into a three-neck flask, add 20ml 1,2-dichloroethane, stir and dissolve at room temperature, so that it is completely dissolved into a uniform solution;

[0034] (2) Add 0.2g of zinc powder and 0.8ml of trifluoroacetic acid to the homogeneous solution in the flask, and continue stirring for 15 minutes;

[0035] (3) Slowly add 4ml of chloromethyl ether dropwise to the mixed solution in the flask. After the dropwise addition is completed, start to heat up to 30°C, and react at this temperature for 2.5 hours, 3 hours and 5 hours respectively;

[0036] (4) After the reaction, a light yellow solution was obtained, cooled to room temperature, then poured into methanol solution to precipitate a white polymer, cut it into pieces, continued to filter and wash with methanol solution for three times, and filtered and washed with deionized water for two times. Second-rate;

[0...

Embodiment 2

[0039] Embodiment 2, the preparation of the monomer (Br-QA) that has a quaternary ammonium functional group:

[0040] (1) Pour 22ml of 1,6-dibromohexane and 25ml of anhydrous ether into a three-neck flask and stir at room temperature, then place the mixture in an ice bath and cool it at close to 0°C;

[0041] (2) After the cooling is completed, slowly add 6ml trimethylamine alcohol solution dropwise under the stirring state, after the dropwise addition is completed, continue to stir at 0°C for 15 minutes;

[0042] (3) The mixed solution was raised to room temperature (25°C), and stirred and reacted at room temperature for 36 hours;

[0043] (4) After the reaction, a white solid product was obtained, which was washed twice with anhydrous ether;

[0044] (5) Dry the washed white solid in a vacuum oven at 40°C for 24 hours;

[0045] (6) Finally, a monomer with a quaternary ammonium functional group, namely Br-QA, was obtained.

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Abstract

The invention provides a multi-quaternary ammonium side long-chain type polysulfone anion exchange membrane and a preparation method thereof, which belong to the field of high polymer chemistry and alkaline anion exchange membrane fuel cells. The anion exchange membrane comprises polysulfone with different chloromethylation degrees and long hydrophobic chain type quaternary ammonium salt with a plurality of quaternary ammonium functional groups. A long side chain is grafted to chloromethylated polysulfone through a Menshutkin reaction, and a target membrane material is prepared through membrane forming by a tape casting method. By constructing a hydrophilic / hydrophobic microphase separation structure, an effective ion channel is formed, and the hydroxyl conductivity of the membrane is improved; meanwhile, a hydrophobic chain containing long alkyl intervals can reduce the swelling degree of the quaternary ammonium salt membrane, the membrane has good dimensional stability, and the problems of ionic conductivity and dimensional stability existing for a long time in a membrane material are effectively solved. The hydroxyl conductivity of the multi-quaternary ammonium side long-chain type polysulfone anion exchange membrane can reach 0.113 S cm<-1> at the temperature of 80 DEG C, and the alkaline anion exchange membrane with excellent performance is obtained.

Description

technical field [0001] The invention belongs to the field of polymer materials and the field of anion-exchange membrane fuel cells, and in particular relates to a preparation method of polysulfone anion-exchange membrane with multiple quaternary ammonium side long chains. Background technique [0002] As a typical representative of a new type of clean energy provider, a fuel cell directly converts the chemical energy stored in fuel and oxidant into electrical energy through an electrochemical method, and the energy conversion efficiency is much higher than that of an internal combustion engine; in addition, the fuel cell uses High-energy-density fuel, a wide range of fuel sources, low noise, the product of the working process is only water, no environmental pollution, it is an efficient and clean energy conversion system. After years of development of fuel cells, various types of batteries with their own advantages have been developed. Among them, alkaline anion exchange me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1072H01M8/1081H01M8/1027C08J5/22C08L81/06C08G75/20
CPCH01M8/1072H01M8/1081H01M8/1027C08J5/2256C08G75/20C08J2381/06Y02E60/50
Inventor 王哲关子娟李媛媛
Owner CHANGCHUN UNIV OF TECH
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