Strongly alkaline polyarylether ionomer and preparation and application thereof

A technology of polyarylether and strong alkali, which is applied in the field of anion exchange membrane materials for alkaline fuel cells, can solve the problems of low ion conductivity, poor stability, complicated preparation, etc., achieve high ion exchange capacity, overcome Unstable properties and good thermal stability

Active Publication Date: 2012-10-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reported polyarylether anion exchange membrane materials are complicated to prepare and expensive, and the membranes have poor stability in alkaline environments and low ion conductivity.

Method used

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  • Strongly alkaline polyarylether ionomer and preparation and application thereof
  • Strongly alkaline polyarylether ionomer and preparation and application thereof
  • Strongly alkaline polyarylether ionomer and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The present embodiment adopts following method to prepare polyarylether:

[0035] Mix bis(4,4'-hydroxyphenyl)diphenylmethane, dichlorosulfone (1-(4-chlorophenylsulfonyl)-4-chlorobenzene), and difluoroketone (bis(4-fiuorophenyl)methanone) at 1:0.5 : molar ratio of 0.5, using N,N-dimethylacetamide as solvent and toluene as water-carrying agent, react at 140°C for 4h, then heat up to 170°C for 4h, cool the reaction solution to room temperature, drop In methanol solution containing hydrochloric acid, a white flocculent precipitate is obtained, which is polyarylether.

[0036] Measured by nuclear magnetic resonance method, the polyarylether of the present embodiment has the following structure

[0037]

[0038] n=90;

[0039]

[0040] Utilize the polyarylether of the present embodiment to prepare the process of strongly basic polyarylether ionomer as follows:

[0041] (1) Chloromethylation of polyarylether: form a 5% solution of polyarylether with tetrachloroethane,...

Embodiment 2

[0057] The present embodiment adopts following method to prepare polyarylether:

[0058] Bis(4,4'-hydroxyphenyl)diphenylmethane, dichlorosulfonyl (1-(4-chlorophenylsulfonyl)-4-chlorobenzene), 1,4-difluorobenzoylbenzene (1,4-Bis (4-fluorobenzoyl)benzene) is fed at a molar ratio of 1:0.5:0.5, with N,N-dimethylacetamide as solvent and toluene as water-carrying agent, first react at 150°C for 4h, then heat up to 180°C for reaction After 8 hours, the reaction solution was cooled to room temperature and dropped into methanol solution containing hydrochloric acid to obtain a white flocculent precipitate, which was polyarylether.

[0059] Measured by nuclear magnetic resonance method, the polyarylether of the present embodiment has the following structure

[0060]

[0061] n=33;

[0062]

[0063] (1) Chloromethylation of polyarylethers: the polyarylethers prepared in this example are added to N,N-dimethylformamide to form a 5% solution, in the following ratio: polyarylethers: ...

Embodiment 3

[0076] The present embodiment adopts following method to prepare polyarylether:

[0077] Bis(4,4'-hydroxyphenyl)diphenylmethane, difluoroketone (bis(4-fluorophenyl)methanone), 1,4-difluorobenzoylbenzene (1,4-Bis(4-fluorobenzoyl )benzene) is fed at a molar ratio of 1:0.5:0.5, with N-methylpyrrolidone as a solvent and toluene as a water-carrying agent, first react at 145°C for 4h, then heat up to 175°C for 6h, then cool the reaction solution to At room temperature, drop it into a methanol solution containing hydrochloric acid to obtain a white flocculent precipitate, which is polyarylether.

[0078] Measured by nuclear magnetic resonance method, the polyarylether of the present embodiment has the following structure

[0079]

[0080] n=38;

[0081]

[0082] In the process of preparing strong basic polyarylether ionomer and basic ion exchange membrane of polyarylether ionomer in this embodiment, the molar ratio of polyarylether: zinc chloride: methyl chloride is =1:1: 40...

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Abstract

The invention discloses strongly alkaline polyarylether ionomer and preparation and application thereof. The strongly alkaline polyarylether ionomer is prepared by polymerizing 2 (4, 4'-hydroxyphenyl) diphenylmethane and chlorine-containing or fluorine-containing aromatic monomer with Ar1 and Ar1 structure to obtain polyarylether, and subjecting the polyarylether to a series of functional processes such as chloromethylation, quaternization and alkalization. An alkaline anion exchange membrane is prepared by casting chloromethylation-based polyarylether solution into a membrane and subjecting the membrane to a series of functional processes such as quaternization and alkalization. The alkaline anion exchange membrane has fine barrier action on methyl alcohol, is fine in physicochemical property, high in thermal stability and fine in conductivity at high temperature, overcomes the defects of unstable property and low ionic conductivity of existing polyarylether anion exchange membranes, is applicable to fuel cell alkaline anion exchange membranes, and has broad application prospect.

Description

technical field [0001] The invention relates to anion-exchange membrane materials for alkaline fuel cells, in particular to polyarylene ether ionomers, their preparation methods and their application in anion-exchange membranes of alkaline fuel cells. Background technique [0002] Due to its low pollution and high energy conversion efficiency, fuel cell technology has become the most popular new energy technology in recent years. A type of proton exchange membrane represented by the perfluoro-skeleton sulfonic acid ion exchange membrane (Nafion) developed by Dupont of the United States is widely used in proton exchange membrane fuel cells (PEMFC) due to its excellent electrochemical performance and good proton conductivity. ). However, the high price of perfluorinated proton exchange membranes, poor alcohol resistance, expensive metal Pt catalyst and plate materials, and catalyst poisoning have greatly hindered the large-scale commercialization of proton exchange membrane f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/48C08G65/40H01M8/02H01M2/16H01M8/102H01M8/1069
CPCY02E60/12Y02E60/50
Inventor 李秀华余英凤刘群方
Owner SOUTH CHINA UNIV OF TECH
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