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Preparation method of anion exchange membrane based on biimidazole cation cross-linking agent

A technology of anion exchange membrane and ion cross-linking agent, which is applied to fuel cell parts, fuel cells, electrical components, etc., can solve the problems of poor chemical stability and achieve the effect of strong polymerization ability

Inactive Publication Date: 2013-09-18
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a kind of anion exchange membrane based on bis-imidazole cation cross-linking agent and preparation method thereof; The present invention avoids the use of chloromethyl ether in the preparation process of quaternary ammonium salt anion exchange membrane, overcomes quaternary ammonium salt type polymer anion The chemical stability of the exchange membrane is poor; the bis-imidazole cationic cross-linking agent greatly improves the mechanical properties of the aliphatic main chain anion exchange membrane

Method used

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  • Preparation method of anion exchange membrane based on biimidazole cation cross-linking agent
  • Preparation method of anion exchange membrane based on biimidazole cation cross-linking agent

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Embodiment 1

[0026] Biimidazolium cationic crosslinking agent Preparation of:

[0027] Under nitrogen protection, add 5.20g (0.055 mol) 1-vinylimidazole and 5.40g (0.025 mol) 1,4-dibromobutane to a three-necked flask equipped with 40ml of acetonitrile; Evaporate to obtain crude product, crude product is washed 3 times with ethyl acetate, vacuum-dried at room temperature 24 hours; Obtain final product 9.10g (productive rate 90.1%), use 1 H NMR. To characterize its structure, such as figure 1 Shown; The cross-linking agent of other structures used in the present invention is prepared with reference to this method.

[0028]

Embodiment 2

[0030] Acrylonitrile 0.10g, 0.20g, 0.20g, 0.01g, mixed evenly and applied to the mold, UV light (wavelength 240nm-380nm) for 30min, in-situ polymerization to form a film; then soak the anion exchange membrane in 60℃ 1M KOH solution for 24 hours to convert anions into OH - ; The OH obtained in this embodiment - The ion conductivity of the type anion exchange membrane at room temperature is 2.1×10 -2 S cm -1 , the ionic conductivity at 90°C is 5.98×10 -2 S cm -1 . The tensile strength is 9.12 Mpa, the Young's modulus is 476.29Mpa, and the elongation at break is 44.21%.

Embodiment 3

[0032] Acrylonitrile 0.20g, 0.20g, 0.20g, benzoin ethyl ether 0.01g, mix the solution evenly, apply it on the mold, irradiate with ultraviolet light (wavelength 240nm-380nm) for 30min, and polymerize in situ to form a film; then soak the anion exchange membrane in 60℃ 1M KOH solution for 24 hours , converting the anion to OH - ; The OH obtained in this embodiment - The ion conductivity of the type anion exchange membrane at room temperature is 1.66×10 -2 S cm -1 , the ionic conductivity at 90°C is 4.25×10 -2 S cm -1 , the tensile strength is 15.66 Mpa, the Young's modulus is 809.33Mpa, and the elongation at break is 32.08%.

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Abstract

The invention relates to an anion exchange membrane and particularly relates to a preparation method of an anion exchange membrane based on a biimidazole cation cross-linking agent. The method comprises the following steps of monomer polymerization membrane formation and anion exchange. The preparation method is characterized by comprising the following steps of: uniformly mixing the biimidazole cation cross-linking agent, acrylonitrile, polymeric imidazolium ionic liquid and an initiator by using an ultraviolet light triggered in-situ polymerization method, then forming a membrane through polymerization triggered by ultraviolet light, and carrying out anion exchange to obtain the anion exchange membrane which can be used for an alkaline fuel cell. The method provided by the invention is simple, convenient and efficient, low in raw material cost and little in harm to the environment and human bodies; the biimidazole cation cross-linking agent not only can be used for improving the mechanical performance of the anion exchange membrane, but also can play an ion conducting role; and the anion exchange membrane has higher conductivity and better mechanical strength.

Description

technical field [0001] The invention relates to anion-exchange membranes, in particular to a method for preparing anion-exchange membranes based on bis-imidazole cationic cross-linking agents. Background technique [0002] Anion exchange membranes have been widely used in industrial fields such as water treatment, hydrometallurgy, and chemical separation; in recent years, researchers are actively studying the application of anion exchange membranes in alkaline fuel cells; however, so far there is no case of high performance The successful report of the alkaline fuel cell in the world is mainly due to the lack of anion exchange membranes with high conductivity, high stability and low fuel permeability; the traditional quaternary ammonium salt anion exchange membranes are very weak under high temperature and strong alkali conditions. Hofmann degradation, nucleophilic degradation and other reactions are prone to occur, resulting in a decrease in the ion exchange capacity of the...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08L39/04C08F226/06C08F220/48C08F2/48H01M8/02H01M2/16H01M8/1072
CPCY02E60/50
Inventor 林本才丁建宁袁宁一储富强
Owner CHANGZHOU UNIV
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