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Strong Basic Polyarylether Ionomer and Its Preparation and Application

A polyarylene ether, strong alkaline technology, applied in the field of anion exchange membrane materials for alkaline fuel cells, can solve the problems of low ionic conductivity, poor stability, complicated preparation, etc., achieve high ion exchange capacity, overcome the Instable properties, good thermal stability

Active Publication Date: 2016-03-02
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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  • Strong Basic Polyarylether Ionomer and Its Preparation and Application
  • Strong Basic Polyarylether Ionomer and Its Preparation and Application
  • Strong Basic Polyarylether Ionomer and Its Preparation and Application

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), difluoroketone (bis(4-fluorophenyl)methanone) at 1:0.5 : The molar ratio of 0.5 is fed, with N,N-dimethylacetamide as solvent and toluene as water-carrying agent, first 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] Utilize the polyarylether of the present embodiment to prepare the process of strongly basic polyarylether ionomer as follows:

[0039] (1) Chloromethylation of polyarylether: form a 5% solution of polyarylether with tetrachloroethane, add ZnCl 2 , h...

Embodiment 2

[0054] The present embodiment adopts following method to prepare polyarylether:

[0055] 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, react at 150°C for 4 hours, and 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.

[0056] Measured by nuclear magnetic resonance method, the polyarylether of the present embodiment has the following structure

[0057]

[0058]

[0059] (1) Chloromethylation of polyarylether: Add the polyarylether prepared in this example to N,N-dimethylformamide to form a 5% solution, and the polyarylether: zinc chloride: methyl chloride The mo...

Embodiment 3

[0072] The present embodiment adopts following method to prepare polyarylether:

[0073] 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, using N-methylpyrrolidone as a solvent and toluene as a water-carrying agent, first reacting at 145°C for 4h, then raising the temperature to 175°C for 6h, then cooling 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.

[0074] Measured by nuclear magnetic resonance method, the polyarylether of the present embodiment has the following structure

[0075]

[0076] In the process of preparing strong basic polyarylether ionomer and basic ion exchange membrane of polyarylether ionomer in this example, the molar ratio of polyarylether: zinc chloride: chloromethyl ether is =1:1: 40; The...

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Abstract

The invention discloses a strongly basic polyarylether ionomer, a preparation method and application thereof. This kind of strongly basic polyarylether ionomer is a kind of polymer based on the polymerization of bis(4,4'-hydroxyphenyl)diphenylmethane and chlorine-containing or fluorine-containing aromatic monomers with Ar1 and Ar2 structures. Aromatic ethers are obtained through a series of functionalization processes including chloromethylation, quaternary ammonium salination and alkalization. The basic anion exchange membrane is obtained by casting a chloromethylated polyarylether solution into a membrane and undergoing a series of functionalization processes of quaternization and alkalization. The obtained basic anion exchange membrane has a good barrier effect on methanol, good physical and chemical properties, high thermal stability, and good conductivity at high temperature, which overcomes the unstable properties of the existing polyarylether anion exchange membranes. The low ion conductivity is suitable for alkaline ion exchange membranes in fuel cells and has broad application prospects.

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 perfluorinated 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 membr...

Claims

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Application Information

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