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A block anion exchange membrane and its preparation method

A technology of anion exchange membrane and block polymer, which is applied in the field of new block anion exchange membrane and its preparation, can solve the problems of hindered molecular chain rotation, increased internal stress of the membrane, and brittle dry film, etc., so as to alleviate mechanical strength, Effects of improving mechanical strength and increasing free volume

Inactive Publication Date: 2018-12-18
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 the ionizing reagent and N,N-dimethylpiperazine Z as the 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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  • A block anion exchange membrane and its preparation method
  • A block anion exchange membrane and its preparation method
  • A block anion exchange membrane and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Dissolve phenolphthalein and hydroxylamine hydrochloride in KOH solution (phenolphthalein: hydroxylamine hydrochloride = 10 mmol: 1.05 mmol), where the concentration of phenolphthalein is 1.2 mol / L, react at 80°C for 3-4 hours to obtain a reaction solution; pour the liquid into acetic acid Acidification treatment in the aqueous solution, filter to remove the insoluble matter to obtain a mixed solution; Add the KOH aqueous solution to the mixed solution until the pink color disappears, stop adding the KOH solution, continue the reaction for about 10 minutes, and 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 an aqueous sulfuric acid solution and refluxed for about 2 hours. After cooling, a gray-green solid was obtained, namely 2-(4-hydroxybenzoyl)-benzoic acid.

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

Embodiment 2

[0043] At room temperature, dissolve decafluorobiphenyl and bisphenol fluorene in N,N-dimethylacetamide, add potassium carbonate as a catalyst and toluene as a dewatering agent, heat up to 60°C and react for 12 hours, then pour the reacted liquid Precipitation into water / ethanol and mixed precipitation agent to obtain oligomer 1 (decafluorobiphenyl: bisphenol fluorene: potassium carbonate = 20mmol: 18.4mmol: 36.8mmol), wherein the molar concentration of decafluorobiphenyl 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 added the catalyst potassium carbonate and the dewatering agent toluene, heated to 50 ℃ and reacted for 12 hours, the reacted liquid was poured into water / ethanol and mixed precipitation agent to precipitate to obtain oligomer 2 (decafluoro Biphenyl: bisphenol fluorene: potassium carbonate = 18mmol: 21.6mmol: 43.2mmol), wher...

Embodiment 3

[0050] At room temperature, dissolve decafluorobiphenyl and bisphenol fluorene in N,N-dimethylacetamide, add potassium carbonate as a catalyst and toluene as a dewatering agent, heat up to 65°C and react for 12 hours, then pour the reacted liquid Precipitation into water / ethanol and mixed precipitation agent to obtain oligomer 1 (decafluorobiphenyl: bisphenol fluorene: potassium carbonate = 19.5mmol: 17.94 mmol: 35.88mmol), in which the molar concentration of decafluorobiphenyl 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 added the catalyst potassium carbonate and the dewatering agent toluene, heated to 50 ℃ and reacted for 12 hours, the reacted liquid was poured into water / ethanol and mixed precipitation agent to precipitate to obtain oligomer 2 (decafluoro Biphenyl: bisphenol fluorene: potassium carbonate = 15mmol: 18mmol: 36mmol), ...

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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] The energy crisis and environmental pollution have become the two most important issues facing society today. As a new type of clean energy, fuel cells have received extensive attention from all over the world. Alkaline anion exchange membrane fuel cell (AEMFC, alkalineelectrolyte membrane fuel cell) is a new type of zero-emission clean energy technology facing energy and environmental issues. Compared with proton membrane fuel cells, its oxygen reduction overpotential is low, and non-noble metal catalysts can be used [S.Lu,J.Pan,A.Huang,L.Zhuang,J.Lu,Proceedings of the National Academy of Sciences 2008,105,20611 -20614.], has cost advantages; the replacement of liquid alkaline electrolyte with alkaline membrane can also avoid leakage problems and electrode blockage caused b...

Claims

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Application Information

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Patent Type & Authority Patents(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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