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Imidazolyl ionic liquid and application thereof in alkaline anion exchange membrane

A basic anion and ionic liquid technology, which is applied in the preparation of the above-mentioned membranes, and the field of imidazole-based cross-linked basic anion-exchange membranes. , easy to form carbene and other problems, to achieve good ion-conducting ability, uniform surface, and enhanced stability

Active Publication Date: 2015-03-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there is no substituent on the 2-position carbon of the imidazole group in the anion exchange membrane prepared by the above method. When attacked by hydroxide ions, it may easily form carbene, and finally cause the ring-opening degradation of the imidazole group.
At the same time, the casting film process using the phase inversion method cannot achieve large-scale preparation well, and can only be cast in small areas and small batches

Method used

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  • Imidazolyl ionic liquid and application thereof in alkaline anion exchange membrane
  • Imidazolyl ionic liquid and application thereof in alkaline anion exchange membrane
  • Imidazolyl ionic liquid and application thereof in alkaline anion exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Add 5mL ethanol, 5mL p-chloromethylstyrene (density 1.08g / cm 3 , molecular weight 152.5g / mol) and 3.8g 1-methyl-2-ethylimidazole (molecular weight 110g / mol), magnetically stirred, and heated in an oil bath at 70°C for 6h, the above solution turned orange. After returning to room temperature, the obtained orange solution was added to 250 mL of ethyl acetate to obtain a light yellow solid imidazolium salt, which was filtered and dried to constant weight before use. Take 1g of imidazolium salt, dissolve it with 5mL dimethyl sulfoxide, add styrene in an amount 3 times that of imidazolium salt, and then add 1% of the sum of the amount of imidazolium salt and styrene Divinylbenzene, the amount of the last added substance is the free radical initiator azobisisobutyronitrile of 1% of the sum of the amount of imidazolium salt and styrene substance; after magnetic stirring is mixed uniformly, freeze-thaw cycle is carried out, and the freezing process In order to freeze the react...

Embodiment 2

[0062] Add 10mL of acetonitrile and 3mL of p-chloromethylstyrene (density 1.08g / cm 3 , molecular weight 152.5g / mol) and 1.9g 1-ethyl-2-hexylimidazole (molecular weight 180g / mol), magnetically stirred and heated in an oil bath at 60°C for 12h, the above solution turned orange. After returning to room temperature, the obtained orange solution was added to 200 mL ethyl acetate to obtain a light yellow solid imidazolium salt, which was filtered and dried to constant weight for later use. Take 1g of imidazolium salt, dissolve it with 5mL dimethyl sulfoxide, add styrene in an amount 4 times that of imidazolium salt, and then add 3% of the sum of imidazolium salt and styrene Divinylbenzene, the amount of the last added substance is 3% of the free radical initiator azobisisobutyronitrile of the sum of the amount of imidazolium salt and styrene substance, and magnetic stirring is mixed to carry out freezing-thawing cycle, freezing process In order to freeze the reaction tube containin...

Embodiment 3

[0065] Into a 100mL reaction tube, add 30mL dimethylformamide and 3mL p-chloromethylstyrene (density 1.08g / cm 3 , molecular weight 152.5g / mol) and 8.8g 1-hexyl-2-butylimidazole (molecular weight 208g / mol), magnetically stirred, and heated in an oil bath at 70°C for 6h, the above mixture turned orange. After returning to room temperature, the obtained orange solution was added to 350 mL of ethyl acetate to obtain a light yellow solid imidazolium salt, which was filtered and dried to constant weight before use. Get 1g of imidazolium salt, dissolve it with 5mL of absolute ethanol and add styrene with a ratio of 1:2 to the amount of substance of imidazolium salt, then add the amount of substance that is 4% of the sum of the amount of substance of imidazolium salt and styrene % of divinylbenzene, the amount of the last added substance is the 1% free radical initiator dibenzoyl peroxide of the sum of the amount of imidazolium salt and styrene substance, and magnetic stirring is mixe...

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Abstract

The invention relates to an imidazolyl ionic liquid and preparation of an alkaline anion exchange membrane with the same. The preparation includes the following three steps: synthesis of an imidazolium salt, synthesis of imidazolyl cross-linked copolymer, and preparation of an imidazolyl cross-linked type alkaline anion exchange membrane, and at the same time on the basis, the step of preparation of an oxyhydrogen type imidazolyl cross-linked alkaline anion exchange membrane can be added so as to further improve the conductivity of the membrane. The ionic liquid involved in the invention substitutes the 2-position of an imidazole ring, thus avoiding imidazole group ring opening and degradation occurring under the attack of hydroxyl ions, and enhancing the stability of the imidazole group. And the method of applying the imidazolyl ionic liquid to preparation of the alkaline anion exchange membrane has the advantages of environmental friendliness, simple process, and can realize large-scale production. The prepared imidazolyl cross-linked alkaline anion exchange membrane has a uniform, smooth and compact surface, and has good conductivity, good thermal stability and chemical stability. By applying the alkaline anion exchange membrane to alkaline direct alcohol fuel cells, a single battery has the advantages of high performance, and obvious performance advantages, etc.

Description

technical field [0001] The invention belongs to the field of polymer electrolyte membranes, and specifically relates to an imidazole-based cross-linked basic anion exchange membrane; the invention also relates to a preparation method of the membrane. Background technique [0002] Anion-exchange membranes are widely used in alkaline anion-exchange membrane fuel cells, supercapacitors, water treatment, and separation of substances. However, the structures of the currently disclosed basic anion exchange membranes are generally of the quaternary ammonium salt type. Chinese patent CN 101850218 A discloses a preparation method of quaternary ammonium salt polymer anion exchange membrane, is to add monomer, solvent and initiator in the reactor, under the protection of inert gas, reflux reaction, then the copolymer is used The organic solvent is dissolved to form a solution, and the membrane is cast by phase inversion method. Finally, the cast membrane is soaked in an aqueous soluti...

Claims

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Application Information

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IPC IPC(8): C07D233/58C08F212/08C08F212/36C08J7/12H01M8/10H01M8/103
CPCC07D233/58C08F212/08C08F212/14C08J7/12C08J2325/06C08J2325/18H01M8/1072C08F212/36Y02E60/50Y02P70/50
Inventor 孙公权杨丛荣王素力胡金波
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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