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Polymer anion exchange membrane and preparation method thereof

An anionic polymer and monomer technology, applied in the field of anion exchange membrane and its preparation, can solve the problems of poor chemical stability, achieve good thermal stability and alkali resistance, simple and safe preparation process, good mechanical properties and stable dimensions sexual effect

Inactive Publication Date: 2012-03-21
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the invention is to provide a novel polymer anion exchange membrane based on imidazolium salt with good performance and its preparation method, to overcome the problem of poor chemical stability of the quaternary ammonium salt type polymer anion exchange membrane, while avoiding the traditional polymerization The use of chloromethyl ether in the preparation process of anion exchange membrane reduces the harm to human body and environment

Method used

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  • Polymer anion exchange membrane and preparation method thereof
  • Polymer anion exchange membrane and preparation method thereof
  • Polymer anion exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of monomers containing imidazole functional groups (Reference: Macromolecules 2010, 43, 10196-10200).

[0035] 1) Add 2,7-dibromo-9,9-bis(6'-bromohexyl)fluorene (5.0g, 7.7mmol), p-hydroxyphenylboronic acid (1.2g, 8.5mmol) to a three-necked flask, 40ml THF and 30ml 2M K 2 CO 3 Solution, nitrogen protection, plus catalyst PdCl 2 (dppf) 160mg, slowly raise the temperature to 70°C, and react for 24 hours. The crude product was extracted and purified by column chromatography to obtain 3.46 g of light yellow crystal 2,7-bis(4'-hydroxyphenyl)-9,9-bis(6'-bromohexane)fluorene, with a yield of 66.2%.

[0036] 2) Add 2,7-bis(4'-hydroxyphenyl)-9,9-bis(6'-bromohexane)fluorene (2.0g, 2.96mmol), 1,2-dimethyl Kimidazole (1ml, 12.5mmol), 20ml of acetonitrile, under nitrogen protection, reacted at 70°C for 12 hours. The crude product was washed with anhydrous ether and dichloromethane to obtain 2.45 g of light yellow solid with a yield of 95.3%.

[0037] The preparati...

Embodiment 2

[0039] Add 0.005mol to the three-necked flask 0.005mol 0.011mol Cs 2 CO 3 , 30ml dimethylsulfoxide and 15ml toluene. Under the protection of nitrogen, the temperature was raised to 120° C. for 4 hours, and the water generated during the reaction was removed, the temperature was slowly raised to 140° C., and the reaction was refluxed for 8 hours. The obtained polymer was precipitated with deionized water, washed with deionized water and ethanol several times, and dried for future use. After fully dissolving 0.1 g of the polymer obtained in N,N-dimethylformamide, the polymer solution was dropped onto a polytetrafluoroethylene plate and dried at 70°C for 2 hours to prepare a Br-type anion exchange membrane .

[0040]The resulting bromine-type anion-exchange membrane was placed in 1M KOH solution and soaked at 60°C for 24 hours until the Br - completely exchanged to OH - After that, get OH - type anion exchange membrane.

[0041] FT-IR Varian CP-3800spectrometer was use...

Embodiment 3

[0044] Add 0.005mol to the three-necked flask 0.005mol 0.011mol K 2 CO 3 , 30ml dimethylsulfoxide and 15ml toluene. Under the protection of nitrogen, the temperature was raised to 120°C for 4 hours, and the water generated during the reaction was removed, the temperature was slowly raised to 140°C, and the reaction was carried out under reflux for 16 hours. The obtained polymer was precipitated with deionized water, washed with deionized water and ethanol several times, and dried for future use. After fully dissolving 0.1 g of the obtained polymer in dimethyl sulfoxide, the polymer solution was dropped onto a polytetrafluoroethylene plate, and dried at 70° C. for 6 hours to prepare a Br-type anion exchange membrane.

[0045] The obtained bromine-type anion exchange membrane was placed in 1M KOH solution, soaked at 60°C for 24 hours, and the Br - completely exchanged to OH - Afterwards, residual KOH was removed with deionized water to obtain OH - type anion exchange me...

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Abstract

The invention belongs to the field of ion polymers, and relates to a anion exchange membrane for alkaline fuel cells. The invention discloses an anion polymer, the repeating unit of which is shown in the diagram. The imidazolium salt-based novel polymer anion exchange membrane with good properties, which is prepared with the anion polymer, the preparation method overcomes the chemical stability of the quaternary ammonium salt polymer anion exchange membrane is poor,and also avoids the usage of chloromethyl methyl ether in the conventional polymer anion exchange membrane preparation process,and therefore the harm on the human body and the environment is reduced.

Description

technical field [0001] The invention relates to a polymer anion exchange membrane and a preparation method thereof, in particular to an anion exchange membrane which can be used in an alkaline fuel cell 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. The traditional preparation method of quaternary ammonium salt type polymer anion exchange membrane must go through the process of chloromethylation when introducing ion exchange groups, and the highly toxic carcinogen chloromethyl ether is used in the process of chloromethylation, which is harmful to Both environmental protection and human health have major hazards. The alkaline polymer electrolyte membrane is one of the core components of the alkaline anion exchange membrane fuel cell, and its performance directly determines the performance and life of the b...

Claims

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Application Information

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IPC IPC(8): C08G65/40H01M2/16
CPCY02E60/10
Inventor 严锋林本才邱丽华
Owner SUZHOU UNIV
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