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Method for preparing N1-long chain alkane substituted-4,5-dimethylimidazole type basic anion exchange membrane

A dimethyl imidazole, basic anion technology, applied in climate sustainability, final product manufacturing, sustainable manufacturing/processing, etc., can solve the decline of electrical conductivity and mechanical strength, quaternary ammonium group detachment from the framework, and ionic conductivity. and other problems, to achieve the effect of being environmentally friendly, overcoming low conductivity, and resisting attacks

Active Publication Date: 2018-05-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Studies have found that there is a certain degree of contradiction between the ion exchange capacity and mechanical strength of this type of anion exchange membrane. For example, when the ion exchange capacity is too large and the water content is too high, the membrane is easy to be brittle. The mechanical strength is guaranteed, but the ionic conductivity is greatly reduced
In addition, quaternized polymer anion exchange membranes may be affected by OH under strong alkali and high temperature conditions. - The nucleophilic attack of the quaternary ammonium group leads to the detachment of the skeleton, which causes the chemical degradation of the membrane, and the electrical conductivity and mechanical strength decrease.

Method used

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  • Method for preparing N1-long chain alkane substituted-4,5-dimethylimidazole type basic anion exchange membrane
  • Method for preparing N1-long chain alkane substituted-4,5-dimethylimidazole type basic anion exchange membrane
  • Method for preparing N1-long chain alkane substituted-4,5-dimethylimidazole type basic anion exchange membrane

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Experimental program
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Embodiment 1

[0037] The synthesis process of 1-butyl-4,5-dimethylimidazolium salt is as follows,

[0038] 1) Add 2gNaH to 20mL NMP solvent, stir in an ice-water bath for 30 minutes, slowly add 2.54,5-dimethylimidazolium salt while stirring, after stirring for 1h, the solution becomes a dark brown turbid liquid;

[0039] 2) Slowly add brominated n-butane alkane dropwise to the solution, the amount of which is 1.5 times the molar mass of 4,5-dimethylimidazolium salt, and stir and react at 30°C for 12 hours to obtain a dark yellow opaque liquid;

[0040] 3) Pour the reaction product into deionized water, and extract with ethyl acetate (ethyl acetate: water volume ratio is 1:1), the extract is a clear light yellow liquid, wash the extract with water several times, and distill under reduced pressure remove ethyl acetate;

[0041] 4) The crude product is separated and purified by chromatography, and the obtained product is 1-butyl-4,5-dimethylimidazole.

[0042] The preparation method of 1-but...

Embodiment 2

[0054] The synthesis process of 1-hexyl-4,5-dimethylimidazolium salt is as follows,

[0055] 1) Add 1gNaH to 20mL of DMAc solvent, stir in an ice-water bath for 30 minutes, slowly add 1.8g of 4,5-dimethylimidazolium salt while stirring, and after stirring for 1h, the solution becomes a dark brown turbid liquid;

[0056] 2) Slowly add n-bromohexane dropwise to the solution, the amount of which is 1.5 times the molar mass of 4,5-dimethylimidazolium salt, and stir and react at 50°C for 124 hours to obtain a dark yellow opaque liquid;

[0057] 3) Pour the reaction product into deionized water, and extract with ethyl acetate (ethyl acetate: water volume ratio is 1:1), the extract is a clear light yellow liquid, wash the extract with water several times, and distill under reduced pressure remove ethyl acetate;

[0058] 4) The crude product is separated and purified by chromatography, and the obtained product is 1-hexyl-4,5-dimethylimidazole.

[0059] The preparation method of 1-he...

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Abstract

The invention relates to a basic anion exchange membrane fuel cell, in particular to a method for preparing an N1-long chain alkane substituted-4,5-dimethylimidazole type basic anion exchange membrane. The method comprises the synthesis of an N1-long chain alkane substituted-4,5-dimethylimidazolium salt, and preparation of an N1-long chain alkane substituted-4,5-dimethylimidazole / polybenzimidazole-polyvinylbenzyl chloride cross-linked basic anion exchange membrane. The N1-long chain alkane substituted-4,5-dimethylimidazole is substituted for the imidazole ring in positions 1,4 and 5, and the stability of the imidazole group can be effectively improved by the hyperconjugation effect and steric hindrance effect. The basic anion exchange membrane prepared with a polymer skeleton with high stability has the characteristics of uniform and smooth surface, high electrical conductivity, good thermal stability and good electrochemical stability, and has potential application prospects in basicanion exchange membrane fuel cells.

Description

technical field [0001] The invention relates to an alkaline anion exchange membrane fuel cell, in particular to a preparation method of an N1-long chain alkane substitution-4,5-dimethylimidazole type alkaline anion exchange membrane. Background technique [0002] Alkaline membrane fuel cell (AEMFC) has the advantages of fast oxygen reduction kinetics, the use of non-platinum catalysts, low material corrosion resistance requirements, and low cost. Still need to improve urgently. This is because the current anion exchange membranes are mainly composed of different polymer skeletons grafted with cationic groups, and the cationic groups are mainly quaternary ammonium groups. [0003] Studies have found that there is a certain degree of contradiction between the ion exchange capacity and mechanical strength of this type of anion exchange membrane. For example, when the ion exchange capacity is too large and the water content is too high, the membrane is easy to be brittle. The ...

Claims

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Application Information

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IPC IPC(8): H01M8/1069H01M8/1072H01M8/1041H01M8/1048
CPCH01M8/1041H01M8/1048H01M8/1069H01M8/1072Y02E60/50Y02P70/50
Inventor 邵志刚郝金凯姜永燚高学强衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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