Polymer anion exchange membrane based on imidazole onium salt and preparation method thereof

An anion-exchange membrane and imidazolium salt technology, applied in the field of polymer anion-exchange membranes based on imidazolium salts and its preparation, can solve the problems of toxicity, poor chemical stability and thermal stability, and difficulty in chloromethylation position and reaction degree Precise control and other issues to achieve excellent mechanical properties, prevent membrane structure damage, good thermal stability and chemical stability

Inactive Publication Date: 2013-04-10
XIAMEN UNIV
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  • Abstract
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Problems solved by technology

In the preparation process of traditional quaternary ammonium polymer membranes, toxic and carcinogenic chloromethylation reagents are often used, and the position and degree of r

Method used

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  • Polymer anion exchange membrane based on imidazole onium salt and preparation method thereof
  • Polymer anion exchange membrane based on imidazole onium salt and preparation method thereof
  • Polymer anion exchange membrane based on imidazole onium salt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 0.01mol of 1-vinyl-3-butyl imidazole bromide and add it to a three-necked flask, then take 0.025mol of styrene, 10mL of ethanol and 0.015g of azobisisobutyronitrile, and place it under the protection of nitrogen at 65 ℃ in an oil bath with magnetic stirring and reflux for 24 hours. After the reaction, the obtained viscous liquid was transferred to a beaker, and vacuum-dried at 60° C. for 6 h. After drying, the product was washed with deionized water, soaked in tetrahydrofuran and washed repeatedly to remove unreacted monomers, and dried at 60°C to obtain a polymer containing imidazolium salt groups.

[0032] 0.6 g of the polymer containing imidazolium salt groups was fully dissolved in 15 mL of N,N-dimethylformamide, vacuum defoamed and cast on a clean glass plate to form a film, and dried at 80°C for 12 hours. The film was peeled off from the glass plate and placed in a 1mol / L NaOH solution. After soaking for 24 hours at room temperature, the NaOH in the film was...

Embodiment 2

[0037] The same method as in Example 1 was adopted, except that the monomer A used was 1-vinyl-3-methylimidazole iodide. The properties of the prepared membranes are listed in Table 1.

[0038] Table 1 Moisture content, ion exchange capacity and conductivity of membranes obtained by different monomer reactions

[0039] Example

Embodiment 3

[0041] The same method as in Example 1 was adopted, except that the monomer A used was 1-vinyl-3-ethyl imidazole bromide. The properties of the prepared membranes are listed in Table 1.

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Abstract

The invention discloses a polymer anion exchange membrane based on imidazole onium salt and a preparation method thereof, and relates to an ion exchange membrane and a preparation method thereof. The preparation method comprises the following steps of: (1) synthesizing of an imidazole onium salt polymer through a radical copolymerizationic compound: adding a monomer A, a monomer B, a vehicle and an initiating agent in a reactor, carrying out sealing and a heating regurgitation reaction under the inert gas protection, and drying and washing a product to obtain the imidazole onium salt polymer; and (2) membrane formation: dissolving the obtained imidazole onium salt polymer in step (1) in an organic solvent to prepare a polymer solution, 5%-10% of mass percent concentration, casting to form a membrane through a phase inversion method, and drying to obtain the polymer anion exchange membrane based on the imidazole onium salt, wherein the imidazole onium salt polymer accounts for 5-10% of the organic solvent. The polymer anion exchange membrane provided by the invention has the advantages that the preparation method is simple, the cost is lower, the electric conductivity is higher, the anion exchange membrane has good heat stability and chemical stability, meanwhile, the use of chloromethyl ether in the traditional polymeric compound anion exchange membrane preparation process is avoided, and the polymer anion exchange membrane can reduce harms to human bodies and environment.

Description

technical field [0001] The invention relates to an ion exchange membrane and a preparation method thereof, in particular to an imidazolium salt-based polymer anion exchange membrane and a preparation method thereof. Background technique [0002] Because of its selective permeability to ions in solution, ion exchange membranes are widely used in desalination of seawater, concentration of salt solutions, purification of organic and inorganic compounds, In the field of fuel cell membrane and ion selective electrode. [0003] Ion-exchange membranes are composed of three parts: polymer matrix, positively charged active groups, and movable anions on the active groups. According to different film-forming materials, they can be divided into inorganic anion-exchange membranes, organic anion-exchange membranes, and organic-inorganic membranes. Hybrid anion exchange membrane. The traditional preparation method of organic anion exchange membranes is to carry out functional modificatio...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M2/16B01J41/12C08F212/06C08F226/06B01J41/13H01M8/103H01M8/1081
CPCY02E60/50
Inventor 方军吕明
Owner XIAMEN UNIV
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