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Alkaline anion exchange membrane based on chemical cross-linking and preparation method thereof

A basic anion, chemical cross-linking technology, applied in the field of basic anion exchange membrane and preparation, can solve the problem of insufficient durability of anion exchange membrane

Pending Publication Date: 2021-09-10
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current main problem is the insufficient durability of the anion exchange membrane in a strong alkaline environment, so it is necessary to provide a new anion exchange membrane

Method used

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  • Alkaline anion exchange membrane based on chemical cross-linking and preparation method thereof
  • Alkaline anion exchange membrane based on chemical cross-linking and preparation method thereof
  • Alkaline anion exchange membrane based on chemical cross-linking and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] 1) Weigh 4g of SEBS and dissolve it in 150mL of dichloromethane, stir it mechanically, after it is completely dissolved, add 3mL of N-methyl-4-piperidone, the solution becomes clear and light yellow.

[0075] 2) Start the ice-water bath reaction. When the temperature drops to about 3-9°C, slowly add 15mL TFSA (trifluoromethanesulfonic acid) and 3mL TFA (trifluoroacetic acid) for 45 minutes. The liquid becomes viscous and the reaction is stopped.

[0076] 3) Pour the light brown liquid from the previous step into deionized water to quench the reaction, stir it mechanically at high speed, crush the viscous polymer, then wash it with deionized water for 4 to 8 times to neutrality, and dry it in vacuum to obtain a chemical cross-linked product. Linked polymer solids.

[0077] 4) Weigh 300 mg of the polymer solid in the previous step, dissolve it in 100 mL of chloroform, and after it is completely dissolved, keep the reaction system in a dark environment, and add 270 mg of K...

Embodiment 2

[0092] 1) Weigh 4g of SEBS and dissolve it in 150mL of dichloromethane, stir it mechanically, after it is completely dissolved, add 3mL of N-methyl-4-piperidone, the solution becomes clear and light yellow.

[0093] 2) Start the reaction in an ice-water bath, and when the temperature drops to about 3-9°C, slowly add 15mL TFSA and 3mL TFA, and react for 65min, the liquid becomes viscous, and the reaction is stopped.

[0094] 3) Pour the light brown liquid from the previous step into deionized water to quench the reaction, stir it mechanically at high speed, crush the viscous polymer, then wash it with deionized water for 4 to 8 times to neutrality, and dry it in vacuum to obtain a chemical cross-linked product. Linked polymer solids.

[0095] 4) Weigh 300 mg of the polymer solid in the previous step, dissolve it in 200 mL of chloroform, and after it is completely dissolved, keep the reaction system in a dark environment, and add 270 mg of K 2 CO 3 , 0.18mL methyl iodide, reac...

Embodiment 3

[0101] 1) Weigh 4g of SEBS and dissolve it in 150mL of dichloromethane, stir it mechanically, after it is completely dissolved, add 3mL of N-methyl-4-piperidone, the solution becomes clear and light yellow.

[0102] 2) Start the reaction in an ice-water bath, and when the temperature drops to about 3-9°C, slowly add 15mL TFSA and 3mL TFA, and react for 110min, the liquid becomes viscous, and the reaction is stopped.

[0103] 3) Pour the light brown liquid from the previous step into deionized water to quench the reaction, stir it mechanically at high speed, crush the viscous polymer, then wash it with deionized water for 4 to 8 times to neutrality, and dry it in vacuum to obtain a chemical cross-linked product. Linked polymer solids.

[0104] 4) Weigh 300 mg of the polymer solid in the previous step, dissolve it in 150 mL of chloroform, and after it is completely dissolved, keep the reaction system in a dark environment, and add 270 mg of K 2 CO 3 , 0.18mL methyl iodide, rea...

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Abstract

Provided are an alkaline anion exchange membrane based on chemical cross-linking and a preparation method thereof. The preparation method comprises the following steps of: carrying out low-temperature chemical cross-linking on a polymer main chain in strong oxidizing acid, piperidone and an organic solvent A, and after the reaction is finished, carrying out quenching, washing and drying to obtain solid powder; adding the powder into an organic solvent B, adding methyl iodide, and carrying out dark reaction at room temperature to obtain polymer powder; and dissolving the polymer powder in an organic solvent C, casting to form a membrane to obtain a polymer membrane, washing the polymer membrane with deionized water, and carrying out anion exchange. According to the invention, a polymer main chain is subjected to self chemical cross-linking through a piperidone type functional group for the first time, so that the mechanical strength and chemical stability are improved; the synthesis path is simplified, the reaction process is shortened, and the yield is improved; and the prepared alkaline anion exchange membrane is compact, transparent, high in ion exchange capacity, good in thermal stability and high in mechanical strength, and development of the polymer ion exchange membrane with high conductivity and strong alkali resistance is realized.

Description

technical field [0001] The invention belongs to the field of polymer anion exchange membranes, and relates to a basic anion exchange membrane based on chemical crosslinking and a preparation method. Background technique [0002] With the advent of the energy crisis, hydrogen energy as a clean energy can effectively replace traditional fossil fuels. At present, hydrogen has been successfully used in proton exchange membrane fuel cells (PEMFC), and hydrogen vehicles and power generation devices have been gradually commercialized. Although PEMFC has been successful in the market, PEMFC has disadvantages compared with anion exchange membrane fuel cells (AEMFC). Foreign monopolized proton exchange membranes and expensive noble metal catalysts have increased production costs. On the contrary, AEMFC can obtain faster oxygen reduction reaction kinetics under alkaline conditions, the choice of catalyst is no longer limited to noble metal catalysts, and in non-strongly acidic environ...

Claims

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Application Information

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IPC IPC(8): C08J5/22H01M8/083C08L53/02C08L25/06C08L79/04C08L81/06C08L79/02
CPCC08J5/225C08J5/2281C08J5/2262H01M8/083H01M2300/0082C08J2353/02C08J2325/06C08J2379/04C08J2381/06C08J2379/02Y02E60/50
Inventor 高展车轰
Owner XI AN JIAOTONG UNIV
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