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Crosslinked anion exchange membrane based on polyphenyl ether/polyvinyl alcohol and preparation method

An anion-exchange membrane and polyvinyl alcohol technology, applied in electrochemical generators, fuel cells, electrical components, etc., can solve the problems of low membrane ion conductivity and severe swelling, so as to improve ion conductivity, reduce swelling, The effect of good application prospects

Active Publication Date: 2020-06-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The article published by Yi et al. in 2014 (J.Power Sources 2014,248,905-914.) uses aminated PVA and poly-p-chloromethylstyrene (PVBC) to carry out quaternization to prepare a cross-linked anion exchange membrane, However, the ionic conductivity of the prepared membrane is not high, and the swelling is serious. When the alkali resistance test is carried out in 1M KOH solution at 40°C, the conductivity can only maintain 50% of the initial value.

Method used

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  • Crosslinked anion exchange membrane based on polyphenyl ether/polyvinyl alcohol and preparation method
  • Crosslinked anion exchange membrane based on polyphenyl ether/polyvinyl alcohol and preparation method
  • Crosslinked anion exchange membrane based on polyphenyl ether/polyvinyl alcohol and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take a certain amount of polyphenylene ether in a three-necked flask, add an appropriate amount of chlorobenzene, and slowly raise the temperature to 80°C under the protection of nitrogen. After the polyphenylene ether is completely dissolved, add 40% wt of N-bromosuccinimide and 2 , 2'-azobisisobutyronitrile (the amount used is 0.5% of the mass of polyphenylene ether), stirred evenly and heated under reflux for 3 hours. After cooling, the reaction mixture was transferred to a beaker and washed several times with ethanol. The polymer was collected and dried under vacuum to obtain bromomethylated polyphenylene oxide (BPPO).

[0033] Get a certain amount of polyvinyl alcohol (PVA) and dissolve in dimethyl sulfoxide (DMSO), then add 10%wt p-imidazole benzaldehyde and concentrated hydrochloric acid (consumption is 0.5% of polyvinyl alcohol quality). After stirring at 50° C. for 72 hours, the resulting mixture was poured into deionized water containing sodium hydroxide to p...

Embodiment 2

[0043] Take a certain amount of polyphenylene ether in a three-necked flask, add an appropriate amount of chlorobenzene, and slowly raise the temperature to 60°C under the protection of nitrogen. After the polyphenylene ether is completely dissolved, add 40% wt of N-bromosuccinimide and 2 , 2'-azobisisobutyronitrile (the amount used is 0.6% of the mass of polyphenylene ether), stirred evenly and heated under reflux for 4 hours. After cooling, the reaction mixture was transferred to a beaker and washed several times with ethanol. The polymer was collected and dried under vacuum to obtain bromomethylated polyphenylene oxide (BPPO).

[0044] Get a certain amount of polyvinyl alcohol (PVA) and dissolve in dimethyl sulfoxide (DMSO), then add 10%wt p-imidazole benzaldehyde and concentrated hydrochloric acid (consumption is 0.5% of polyvinyl alcohol quality). After stirring at 60° C. for 72 hours, the resulting mixture was poured into deionized water containing sodium hydroxide to p...

Embodiment 3

[0048] Take a certain amount of polyphenylene ether in a three-necked flask, add an appropriate amount of chlorobenzene, and slowly raise the temperature to 50°C under the protection of nitrogen. After the polyphenylene ether is completely dissolved, add 40% wt of N-bromosuccinimide and 2 , 2'-azobisisobutyronitrile (the amount used is 1.0% of the mass of polyphenylene ether), stirred evenly and heated under reflux for 5 hours. After cooling, the reaction mixture was transferred to a beaker and washed several times with methanol. The polymer was collected and dried under vacuum to obtain bromomethylated polyphenylene oxide (BPPO).

[0049] Get a certain amount of polyvinyl alcohol (PVA) and dissolve in dimethyl sulfoxide (DMSO), then add 10%wt p-imidazole benzaldehyde and concentrated hydrochloric acid (consumption is 0.5% of polyvinyl alcohol quality). After stirring at 50° C. for 60 hours, the resulting mixture was poured into deionized water containing sodium hydroxide to ...

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Abstract

The invention relates to a cross-linked anion exchange membrane based on polyphenyl ether / polyvinyl alcohol and a preparation method thereof. In the invention, bromomethylated polyphenyl ether is usedas a membrane matrix, imidazole functionalized polyvinyl alcohol is used as a functional macromolecular cross-linking agent, wherein a cross-linked structure is formed while functionalization is performed, and the cross-linked anion exchange membrane is convenient and efficient. The raw materials polyphenyl ether and polyvinyl alcohol used in the preparation process are environment-friendly materials, are relatively low in cost, and have a good application prospect in alkaline anion exchange membrane fuel cells. The fuel cell performance of the film has the following advantages: 1, the mechanical property is good, the tensile strength can reach 46 MPa at most, and the elongation at break is 10 + / - 1.8% at most; 2, the conductivity is high, and the conductivity of hydroxyl ions at 80 DEG Ccan reach 78 mS / cm and is higher than that of most anion exchange membranes; 3, the size stability is good, and the water absorption swelling ratio at 80 DEG C does not exceed 40%; and 4, the alkaliresistance is good, and the conductivity can still be kept at 76% of the initial value after soaking in a 1M NaOH aqueous solution at 80 DEG C for 500 hours.

Description

technical field [0001] The invention belongs to the field of basic anion exchange membranes, relates to a crosslinked anion exchange membrane based on polyphenylene ether / polyvinyl alcohol and a preparation method thereof, in particular to a functionalized polyvinyl alcohol using a macromolecular crosslinking agent imidazole ( PVAIm) method for crosslinking bromomethylated polyphenylene oxide (BPPO). Background technique [0002] In recent years, fuel cells have become a new type of power generation technology after atomic power generation and thermal power generation. It can effectively convert the chemical energy of fuel and oxidant into electrical energy and thermal energy through electrochemical reactions without being affected by the Carnot cycle. It is recognized as an efficient and clean energy source in the 21st century and can be widely used in the power supply of electric vehicles and portable devices. [0003] As a key component in fuel cells, ion exchange membra...

Claims

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Application Information

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IPC IPC(8): C08L71/12C08L29/04C08J5/22H01M8/1027H01M8/103H01M8/1072
CPCC08J5/2243C08J5/2268C08J5/2256C08J5/2287H01M8/1027H01M8/103H01M8/1072C08J2371/12C08J2429/04Y02E60/50
Inventor 张秋禹杨薇弘闫毅
Owner NORTHWESTERN POLYTECHNICAL UNIV
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