Anion exchange membrane based on ionic liquid crosslinking agent and preparation method of anion exchange membrane

A technology of anion exchange membrane and ionic liquid, which is applied in the field of anion exchange membrane based on ionic liquid crosslinking agent and its preparation, can solve the problems of poor chemical stability, achieve good thermal stability, improve electrical conductivity and mechanical properties, and avoid The effect of the use of organic solvents

Inactive Publication Date: 2012-09-26
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a new type of anion exchange membrane based on ionic liquid crosslinking agent and its preparation method with good performance, so as to avoid the use of chloromethyl ether in the preparation process of traditional polymer anion exchange membrane and avoid solution casting The use of organic solvents in the process of preparing anion-exchange membranes by film-forming methods does not require the addition of additional cross-linking agents to improve the mechanical properties of the membranes and overcome the problems of poor chemical stability of quaternary ammonium salt-based polymer anion-exchange membranes.

Method used

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  • Anion exchange membrane based on ionic liquid crosslinking agent and preparation method of anion exchange membrane
  • Anion exchange membrane based on ionic liquid crosslinking agent and preparation method of anion exchange membrane
  • Anion exchange membrane based on ionic liquid crosslinking agent and preparation method of anion exchange membrane

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Experimental program
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Effect test

Embodiment 1

[0028] Ionic Liquid Crosslinker Preparation of:

[0029] Under nitrogen protection, 6.05g (0.05mol) allyl bromide, 4.05g (0.05mol) 2-methylimidazole, 0.05g hydroquinone and 5.61g (0.10mol) were added to a three-necked flask with 40ml of acetonitrile ) KOH stirred at room temperature for 4 hours, filtered and rotary evaporated to obtain the crude product, the crude product was dissolved in chloroform, extracted with water, the chloroform layer was taken, anhydrous magnesium sulfate was added to remove water, and the product 2-methyl-1 was obtained by rotary evaporation Allylimidazole 5.3 g (87% yield).

[0030] Under nitrogen protection, add 2-methyl-1 allyl imidazole 3.05g (0.025mol), allyl bromide 3.03g (0.025mol), 0.03g hydroquinone and 20ml ethyl acetate in the three-necked flask, React at room temperature for 48 hours, the reactant was washed 3 times with ethyl acetate, and vacuum-dried at room temperature for 24 hours. 6.60 g of the final product (yield 92%) was obtain...

Embodiment 2

[0032] 0.2g, acrylonitrile 0.2g, styrene 0.1g, 0.01g, divinylbenzene 0.02g, 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. The anion exchange membrane was then soaked in 1M KOH solution at 60°C for 24 hours to convert anions into OH - , the OH obtained in this example - The ion conductivity of the type anion exchange membrane at room temperature is 1.6×10 -2 S cm -1 , the ionic conductivity at 90°C is 4.53×10 -2 S cm -1 . The tensile strength is 9.23 Mpa, the Young's modulus is 421.34 Mpa, and the elongation at break is 61.34%.

Embodiment 3

[0034] 0.2g, acrylonitrile 0.3g, 0.01g, divinylbenzene 0.02g, 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. The anion exchange membrane was then soaked in 1M KOH solution at 50°C for 24 hours to convert anions into OH - , the OH obtained in this example - The ion conductivity of the type anion exchange membrane at room temperature is 1.8×10 -2 S cm -1 , the ionic conductivity at 90°C is 5.03×10 -2 S cm -1 . The tensile strength is 8.76 Mpa, the Young's modulus is 391.53Mpa, and the elongation at break is 68.12%.

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Abstract

The invention discloses an anion exchange membrane based on an ionic liquid crosslinking agent and a preparation method of the anion exchange membrane.. The method comprises the following steps: carrying out initiated polymerization film-forming on an ionic liquid crosslinking agent and monomers by using an in-situ polymerization method, and then carrying out anion exchange on the obtained product so as to prepare the anion exchange membrane capable of being applied to alkaline fuel cells. The method disclosed by the invention is simple, efficient and low in costs of raw materials, and has less harms to the environment and a human body; the ionic liquid in the anion exchange membrane not only achieves an effect of ionic conduction, but also can be used for improving the mechanical performance of the anion exchange membrane, and avoiding the application of other crosslinking agents. The obtained anion exchange membrane based on the ionic liquid crosslinking agent is good in thermal stability, has high conductivity, and has good stability in a strong alkaline solution.

Description

technical field [0001] The invention relates to an anion exchange membrane, in particular to an anion exchange membrane based on an ionic liquid cross-linking agent and a preparation method thereof. Background technique [0002] Anion exchange membranes have been widely used in industrial fields such as water treatment, hydrometallurgy, chemical separation and alkaline fuel cells. Traditional polymer anion exchange membranes have low thermal stability and chemical stability. Under high temperature or alkaline conditions, the quaternary ammonium groups in the polymer are easily degraded, resulting in a decrease in ion exchange capacity, thereby greatly reducing the electrical conductivity. This in turn causes alkaline fuel cells to degrade. [0003] Chinese invention patent CN101844042A discloses a preparation method of anion-exchange membrane based on ionic liquid: add imidazole-type ionic liquid, acrylate monomer, solvent, initiator into the reactor, polymerize and separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F226/06C08F220/48C08F212/08C08F212/12C08F220/50C08J5/22
Inventor 严锋林本才
Owner SUZHOU UNIV
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