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Anion-exchange film, preparation method thereof and fuel cell

An anion exchange membrane and coating liquid technology, applied in anion exchange, ion exchange, fuel cell parts and other directions, can solve the problems of poor membrane structure uniformity, low mechanical strength, poor ion conductivity and mechanical properties, etc. The effect of good thermal stability, high mechanical strength and high OH-conductivity

Active Publication Date: 2013-10-30
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the cation exchange membrane based on imidazole has good alkali resistance and thermal stability, the mechanical strength of the membrane directly prepared from ethylene monomer polymer is low, and it must be blended with aromatic polymer to improve the mechanical strength of the membrane. performance
However, the uniformity of the membrane structure obtained by simple mechanical blending is poor, and the membrane is a semi-homogeneous structure, and its ion conductivity and mechanical properties are poor.

Method used

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  • Anion-exchange film, preparation method thereof and fuel cell
  • Anion-exchange film, preparation method thereof and fuel cell
  • Anion-exchange film, preparation method thereof and fuel cell

Examples

Experimental program
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preparation example Construction

[0038] The preparation steps of the coating liquid include the following process: brominated poly(2,6-dimethyl-1,4-phenylene oxide) or brominated polyphenylene with a degree of methyl bromide of 10%-100% The ether is dissolved in an organic solvent and is configured as a polymer solution of 5%-25% (mass percentage), according to the brominated poly(2,6-dimethyl-1,4-phenylene oxide) containing bromomethyl 0.1-5 times the molar amount is added with N-substituted imidazole small molecules, and the reaction is stirred at 20-80°C for 4-50 h to obtain imidazole functionalized polyphenylene ether coating liquid.

[0039] The brominated polyphenylene ether used in the present invention has the structural formula shown in the following formula (2):

[0040]

[0041] In the preparation method of the present invention, the organic solvent used is toluene, chlorobenzene, N-methylpyrrolidone (NMP), N,N-dimethylformamide (DMF) or N,N-dimethylacetamide (DMAc).

[0042] The structure formula of th...

Embodiment 1

[0056] 1. Preparation of coating liquid: 3g of brominated polyphenylene oxide (BPPO) (produced by Shandong Tianwei Membrane Technology Co., Ltd.) with a degree of bromination of 57.8% (produced by Shandong Tianwei Membrane Technology Co., Ltd.) was dissolved in 20 mL of N-methylpyrrolidone (NMP), After the polymer is completely dissolved, add 900 μL of N-methylimidazole (produced by Shanghai Demer Pharmaceutical Technology Co., Ltd.), where the ratio of the molar amount of bromomethyl contained in the N-methylimidazole to the brominated polyphenylene ether is 129.5 :100, magnetic stirring reaction at 30°C for 10h to obtain imidazole-functionalized brominated polyphenylene ether (BPPO-Im) coating liquid.

[0057] 2. Film forming steps:

[0058] The glass plate as the substrate is soaked in lye for one day, and then rinsed repeatedly with tap water and twice with distilled water after being taken out, and dried in an oven to obtain a clean glass plate.

[0059] The coating liquid obta...

Embodiment 2

[0085] The same operation process as in Example 1 was adopted, except that the amount of N-methylimidazole added was changed to 600 μL to obtain an anion exchange membrane with a similar structure.

[0086] Through the same performance measurement as shown in Example 1, it is measured that the moisture content of the obtained membrane is 58%, the ion exchange capacity is 2.21mmol / g dry membrane, and the OH at 20°C - Conductivity is 2.4×10 -2 S / cm. The thermal decomposition temperature is 185°C and the tensile strength is 21MPa. After soaking in 2mol / L NaOH for one week, at 20℃ OH - The conductivity drops only by 7%.

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Abstract

The invention provides an anion-exchange film, a preparation method of the anion-exchange film and a fuel cell. The anion-exchange film comprises imidazole functionalized brominated polyphenylene oxide with the structure shown in the specification. The preparation technology of the film is simple, the obtained imidazole functionalized brominated polyphenylene oxide has excellent film properties, such as high anion-exchange film OH-conductivity, good heat stability and good alkaline resistance, and the performance of the film can be adjusted and controlled by simply changing the adding amount of N-substitution imidazole micromolecules.

Description

Technical field [0001] The invention relates to an anion exchange membrane and a preparation method thereof and a fuel cell, in particular to an imidazole-functionalized brominated polyphenylene ether homogeneous anion exchange membrane and a preparation method thereof, and a brominated polyphenylene ether functionalized using the imidazole Homogeneous anion exchange membrane fuel cell. Background technique [0002] Anion exchange membranes have a wide range of applications in the fields of electrodialysis, diffusion dialysis, alkaline fuel cells, membrane electrolysis, electrochemical sensors, etc., and their development and optimization have always attracted the attention of industry and theory. Most of the existing anion exchange membranes use quaternary ammonium groups as anion exchange groups, and their alkali resistance, thermal stability, conductivity, and mechanical strength are poor. [0003] For example, Chinese patent CN200810047595.0 discloses a method for preparing an...

Claims

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Application Information

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IPC IPC(8): B01D71/52B01D67/00B01D69/10B01J41/12C08G65/48C08J5/22H01M8/02H01M2/16B01J41/13
CPCY02E60/12Y02E60/50
Inventor 徐铜文冉瑾
Owner UNIV OF SCI & TECH OF CHINA
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