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Graft copolymer anion exchange membrane and preparation method thereof

An anion exchange membrane and graft copolymer technology, which is applied in the field of graft copolymer anion exchange membrane and its preparation, can solve the problems of inability to form efficient ion channels, few active sites, and low ion conductivity, and achieve durable Excellent alkaline performance, improved ion conductivity, high ion conductivity effect

Inactive Publication Date: 2016-06-15
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Zhang et al. (Chemical Communications, 46(40), 7495-7497.) synthesized a graft copolymer anion-exchange membrane. Larger ion clusters were formed inside the membrane, but due to too few active sites on the branched chain, each The branched chain contains only one ionic group, which cannot form efficient ion channels, resulting in low ion conductivity of the membrane.

Method used

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  • Graft copolymer anion exchange membrane and preparation method thereof
  • Graft copolymer anion exchange membrane and preparation method thereof
  • Graft copolymer anion exchange membrane and preparation method thereof

Examples

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Embodiment 1

[0032] The graft copolymer anion exchange membrane of the present embodiment has the chemical structural formula as follows:

[0033]

[0034] where x:y=90:10, z=18.5.

[0035] The concrete preparation method of this implementation comprises the following steps:

[0036]1) Synthesis of methoxy-containing copolymer: 0.22g of 2-methoxyhydroquinone, 4.07g of 4,4'-difluorodiphenyl sulfone, 4.84g of bisphenol AF and 4.42g of anhydrous potassium carbonate were dissolved in 50mL Add 15mL of anhydrous toluene to dimethylacetamide, raise the temperature to 140°C under the protection of nitrogen for reflux reaction for 4h, distill off the toluene and water, raise the temperature to 155°C to continue the reaction for 16h, cool to room temperature, pour methanol and water The mixture precipitates, and the methoxy-containing copolymer is obtained after filtering, washing and drying.

[0037] 2) Synthesis of hydroxyl-containing copolymer: Dissolve 4g of methoxy-containing copolymer in ...

Embodiment 2

[0045] The graft copolymer anion exchange membrane of the present embodiment has the chemical structural formula as follows:

[0046]

[0047] where x:y=90:10, z=14.

[0048] The preparation method of the present embodiment is with embodiment 1, and difference is:

[0049] 1) Synthesis of methoxy-containing copolymer: the reactants are 0.22g 2-methoxyhydroquinone, 3.01g4,4'-difluorobiphenyl, 3.28g bisphenol A and 5.24g anhydrous potassium carbonate, first React at 145°C for 3h, then raise the temperature to 165°C and continue to react for 20h.

[0050] 2) Synthesis of hydroxyl-containing copolymer: the amount of boron tribromide used in the demethylation process was 2.5 mL.

[0051] 3) Synthesis of polyphenylene ether: The reactants are 10g of 2,6-dimethylphenol, 0.32g of anhydrous cuprous chloride and 1.92g of N,N,N',N'-tetramethyl-1,4-butanedi Amine, alcohol solvent is 100mL methanol, the rate of oxygen flow is 200mLmin -1 .

[0052] 4) Synthesis of fluorine-containi...

Embodiment 3

[0058] The graft copolymer anion exchange membrane of the present embodiment has the chemical structural formula as follows:

[0059]

[0060] where x:y=85:15, z=18.5.

[0061] The preparation method of the present embodiment is with embodiment 1, and difference is:

[0062] 1) Synthesis of methoxy-containing copolymer: the reactants were 0.34g 2-methoxyhydroquinone, 4.07g 4,4'-difluorodiphenyl sulfone, 4.57g bisphenol AF and 5.53g anhydrous potassium carbonate.

[0063] 2) Synthesis of hydroxyl-containing copolymer: 3 g of methoxy-containing copolymer, 60 mL of dichloroethane as solvent, 8 mL of boron tribromide added, 0°C reaction temperature, and 10 h reaction time.

[0064] 3) Synthesis of polyphenylene ether: the reactants are 9.54g 2,6-dimethylphenol, 0.06g anhydrous cuprous chloride, 0.56g N,N,N',N'-tetramethyl-1,4-butyl diamine.

[0065] 4) Synthesis of fluorine-containing polyphenylene ether: the reactants are 3.1g polyphenylene ether, 2.5g hexafluorobenzene and...

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Abstract

The invention discloses a graft copolymer anion exchange membrane and a preparation method thereof and relates to an anion exchange membrane. Polyphenyl ether is connected with a copolymer through chemical bonds by means of a grafting reaction, a graft copolymer is formed, cation groups are grafted into a polymer branch through a bromination and functionalization reaction, and free anions have an ion transferring effect. The preparation method includes the steps of synthesis of a copolymer containing methoxyl group; synthesis of a copolymer containing hydroxyl groups; synthesis of polyphenyl ether; synthesis of fluorine-based polyphenyl ether; synthesis of the graft copolymer; synthesis of the bromide graft copolymer; preparation of the graft copolymer anion exchange membrane. Highly-toxic chloromethylation reagents do not need to be used in the preparation process, and the prepared graft copolymer membrane has high ionic conductivity, good alkali resistance and excellent mechanical performance.

Description

technical field [0001] The invention relates to an anion exchange membrane, in particular to a graft copolymer anion exchange membrane mainly used in a fuel cell and a preparation method thereof. Background technique [0002] Fuel cells directly convert chemical energy stored in fuels and oxidants into electrical energy through electrochemical reactions, which is a new type of energy technology. Compared with traditional energy technologies (such as thermal power generation), fuel cells are not limited by the Carnot cycle, have higher power density, energy conversion rate as high as 50-70%, and less pollution, and are environmentally friendly. It has broad application prospects in fields such as energy and transportation. In recent decades, Alkaline Fuel Cell (AFC) has the characteristics of high power density and low catalyst cost due to its high redox reaction kinetic rate, allowing the use of non-precious metal (such as silver, nickel, etc.) catalysts , which has arouse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08G81/00C08G65/48H01M8/102
CPCC08G65/485C08G81/00C08J5/2293C08J2387/00H01M8/1044Y02E60/50
Inventor 刘庆林林陈晓张秋根朱爱梅
Owner XIAMEN UNIV