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Novel block anion exchange membrane and preparation method thereof

An anion-exchange membrane, a new type of technology, applied in the field of new-type block anion-exchange membranes and its preparation, can solve the problems of dry film becoming brittle, increasing the internal stress of the membrane, and hindering the rotation of molecular chains, so as to increase the free volume and improve the mechanical properties. Strength, the effect of relieving mechanical strength

Inactive Publication Date: 2016-08-31
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cross-linking density should not be too high, otherwise the stress inside the film will be increased, causing the rotation of molecular chains to be hindered, resulting in the dry film becoming brittle
Wang et al. used N-methylimidazole as an ionizing reagent and N,N-dimethylpiperazine Z as a cross-linking reagent to prepare a cross-linked basic anion-exchange membrane. The swelling degree and water absorption of the membrane were improved. but low conductivity

Method used

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  • Novel block anion exchange membrane and preparation method thereof
  • Novel block anion exchange membrane and preparation method thereof
  • Novel block anion exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Dissolve phenolphthalein and hydroxylamine hydrochloride in KOH solution (phenolphthalein: hydroxylamine hydrochloride = 10mmol: 1.05mmol), wherein the concentration of phenolphthalein is 1.2mol / L, react at 80°C for 3-4h to obtain a reaction solution; pour the liquid into acetic acid Perform acidification treatment in the aqueous solution, filter and remove insoluble matter to obtain a mixed solution; add KOH aqueous solution dropwise to the mixed solution until the pink color disappears, stop adding the KOH solution, continue the reaction for about 10 minutes, then add an appropriate amount of absolute ethanol as a dispersant, and use acetic acid to make The solution was weakly acidic; the yellow substance was filtered and dissolved in sulfuric acid aqueous solution and refluxed for about 2 hours. After cooling, a gray-green solid was obtained, which was 2-(4-hydroxybenzoyl)-benzoic acid.

[0034] The 2-(4-hydroxybenzoyl)-benzoic acid and hydrazine hydrate prepared abov...

Embodiment 2

[0043] At room temperature, dissolve decafluorobiphenyl and bisphenol fluorene in N,N-dimethylacetamide, add catalyst potassium carbonate and water-removing agent toluene, heat up to 60°C for 12 hours, pour the reacted liquid Precipitate into water / ethanol and a mixed precipitant to obtain oligomer 1 (decafluorobiphenyl: bisphenol fluorene: potassium carbonate = 20mmol: 18.4mmol: 36.8mmol), wherein the decafluorobiphenyl molar concentration is 0.13mol / L;

[0044] At room temperature, dissolve decafluorobiphenyl and 4-(4-hydroxyphenyl)-2,3-phthalazin-1-one (DHPZ) in N,N-dimethylacetamide, where DHPZ is Prepared in Example 1, and add catalyst potassium carbonate and water-removing agent toluene, heat up to 50 ° C for 12 hours, pour the reacted liquid into water / ethanol and mixed precipitant for precipitation to obtain oligomer 2 (decafluoro Biphenyl: bisphenol fluorene: potassium carbonate = 18mmol: 21.6mmol: 43.2mmol), wherein the molar concentration of decafluorobiphenyl is 0....

Embodiment 3

[0050] At room temperature, dissolve decafluorobiphenyl and bisphenol fluorene in N,N-dimethylacetamide, add catalyst potassium carbonate and water-removing agent toluene, heat up to 65°C for 12 hours, pour the reacted liquid Precipitate into water / ethanol and mixed precipitant to obtain oligomer 1 (decafluorobiphenyl: bisphenol fluorene: potassium carbonate=19.5mmol: 17.94mmol: 35.88mmol), wherein the decafluorobiphenyl molar concentration is 0.14mol / L ;

[0051] At room temperature, dissolve decafluorobiphenyl and 4-(4-hydroxyphenyl)-2,3-phthalazin-1-one (DHPZ) in N,N-dimethylacetamide, where DHPZ is Prepared in Example 1, and add catalyst potassium carbonate and water-removing agent toluene, heat up to 50 ° C for 12 hours, pour the reacted liquid into water / ethanol and mixed precipitant for precipitation to obtain oligomer 2 (decafluoro Biphenyl: bisphenol fluorene: potassium carbonate = 15mmol: 18mmol: 36mmol), wherein the molar concentration of decafluorobiphenyl is 0.14...

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Abstract

The invention discloses a novel block anion exchange membrane. A block main chain of the anion exchange membrane contains a bending unit (biphenyl fluorene) and a twisting unit (phthalazinone); according to the structure, a non-coplanar effect can be enhanced. A preparation method of the anion exchange membrane comprises the following steps of performing polycondensation on decafluorobiphenyl (slightly excessive) and bisphenol fluorine to prepare an oligomer 1; using the decafluorobiphenyl and 4-(4-hydroxyphenyl)-2,3-phthalazine-1-one to prepare an oligomer 2; polymerizing the oligomer 1 with the oligomer 2 to obtain a polymer main chain, and performing ionization treatment, membrane casting and alkali treatment on a chloromethylation main chain to obtain the anion exchange membrane. The anion exchange membrane has better chemical stability, and higher electric conductivity and resistance to swelling, and is suitable for being applied in the aspect of alkaline fuel cells.

Description

technical field [0001] The invention belongs to the field of fuel cell membrane materials, and relates to a novel block anion exchange membrane and a preparation method thereof. Background technique [0002] Energy crisis and environmental pollution have become the two most important problems facing today's society. As a new type of clean energy, fuel cells have attracted widespread attention from all over the world. Alkaline anion exchange membrane fuel cell (AEMFC, alkaline electrolyte membrane fuel cell) is a new zero-emission clean energy technology for energy and environmental issues. Compared with proton membrane fuel cells, its oxygen reduction overpotential is low, and non-noble metal catalysts can be used 20614.], which has a cost advantage; the alkaline membrane instead of the liquid alkaline electrolyte can also avoid the problem of liquid leakage and electrode blockage caused by carbonation crystallization. Therefore, AEMFC has attracted much attention in recen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08J5/22H01M8/103H01M8/1072
CPCC08G81/00C08J5/2262C08J2365/00H01M8/103H01M8/1072Y02E60/50
Inventor 张凤祥张奎博甘瑞君刘燕祥李姗姗
Owner DALIAN UNIV OF TECH
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