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A kind of cross-linked anion exchange membrane based on polyphenylene ether/polyvinyl alcohol and preparation method thereof

An anion exchange membrane, polyvinyl alcohol technology, applied in electrochemical generators, fuel cells, electrical components, etc., can solve the problems of low ionic conductivity and serious swelling of membranes, and achieve high conductivity, low cost, mechanical good performance

Active Publication Date: 2022-08-05
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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  • A kind of cross-linked anion exchange membrane based on polyphenylene ether/polyvinyl alcohol and preparation method thereof
  • A kind of cross-linked anion exchange membrane based on polyphenylene ether/polyvinyl alcohol and preparation method thereof
  • A kind of cross-linked anion exchange membrane based on polyphenylene ether/polyvinyl alcohol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

Embodiment 2

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

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

Embodiment 3

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

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

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Abstract

The invention relates to a cross-linked anion exchange membrane based on polyphenylene ether / polyvinyl alcohol and a preparation method thereof. Bromomethylated polyphenylene ether is used as a membrane matrix, and imidazole-functionalized polyvinyl alcohol is used as a functional macromolecular cross-linking agent. , forming a cross-linked structure while functionalizing, which is convenient and efficient. The raw materials polyphenylene ether and polyvinyl alcohol used in the preparation process are both environmentally friendly materials, and have low cost, and have good application prospects in alkaline anion exchange membrane fuel cells. The fuel cell performance of the film has the following advantages: 1. Good mechanical properties, tensile strength up to 46Mpa, elongation at break up to 10±1.8%; 2. High electrical conductivity, hydroxide ion conductivity at 80°C It can reach 78mS / cm, which is higher than most anion exchange membranes; 3. Good dimensional stability, the water-swelling ratio at 80°C does not exceed 40%; 4. Good alkali resistance, soak in 1M NaOH aqueous solution at 80°C for 500 hours , the conductivity can still be maintained at 76% of the initial value.

Description

technical field [0001] The invention belongs to the field of basic anion exchange membranes, and relates to a polyphenylene ether / polyvinyl alcohol-based cross-linked anion exchange membrane and a preparation method thereof, in particular to a polyvinyl alcohol (polyvinyl alcohol) functionalized with a macromolecular cross-linking agent imidazole ( PVAIm) method for cross-linking bromomethylated polyphenylene ether (BPPO). Background technique [0002] In recent years, fuel cells have become a new type of power generation technology following 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 reaction without being affected by the Carnot cycle. [0003] As a key component in fuel cells, ion-exchange membranes are ionic conductors for redox reactions in cells. Perfluorosulfonic acid membrane Nafion, as the most famous proton exchange membra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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