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Simple and green cross-linked composite anion exchange membrane and preparation method thereof

An anion exchange membrane and composite technology, applied in the field of cross-linked composite anion exchange membrane and its preparation, can solve the problem that the membrane is difficult to balance electrical conductivity and mechanical properties, chemical stability and mechanical properties are decreased, and the synthesis method of copolymerized AEMS is complicated. and other problems, to achieve the effect of taking into account the conductivity-stability and the green synthesis method

Inactive Publication Date: 2018-02-06
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is often used, there are two disadvantages in this method (1) chloromethyl methyl ether is used as a chloromethylation reagent, and this chemical is carcinogenic
(2) The film made by this method is difficult to balance the relationship between conductivity and mechanical properties, because these properties depend on the degree of chloromethylation and quaternization, which is difficult to control; if chloromethyl High degree of chemicalization and quaternization, high electrical conductivity but lower chemical stability and mechanical properties, and vice versa
There is also a copolymerization method to prepare a copolymerized AEMS that can improve the conductivity and stability of the film, but the synthesis method of the copolymerized AEMS is relatively complicated, so it hinders the practical application of the copolymerized film

Method used

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  • Simple and green cross-linked composite anion exchange membrane and preparation method thereof
  • Simple and green cross-linked composite anion exchange membrane and preparation method thereof
  • Simple and green cross-linked composite anion exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0025] The first step, synthesis of polybenzoxazine (BZ)

[0026] At 8°C, add 16ml of methylamine and 18ml of dioxane dropwise into a mixed solution of 28ml of formaldehyde and 75ml of dioxane to dissolve, stir well, then add 95ml of 0.1mol / l bisphenol A solution, The reaction at 40° C. was completed after 6 hours. The reacted solution was washed with 40 ml of ethyl acetate and 40 ml of deionized water, then dried with anhydrous magnesium sulfate, and the ethyl acetate was evaporated in vacuum to obtain a benzoxazine monomer solution. Phenolics in the resulting solution were removed by washing with 3M NaOH.

[0027] In the second step, ethanol swells the microporous basement membrane

[0028] The microporous membrane was immersed in ethanol solution for 2 hours at room temperature to obtain a swollen microporous membrane. The microporous base membrane is a polysulfone microporous membrane. The pore diameter is 0.4 microns, the porosity is 70%, and the thickness is 16 micron...

Embodiment example 2

[0033] The first step, synthesis of polybenzoxazine (BZ)

[0034] At 10°C, add 17ml of methylamine and 20ml of dioxane dropwise into a mixed solution of 30ml of formaldehyde and 80ml of dioxane to dissolve, stir well, then add 98ml of 0.1mol / l bisphenol A solution, After reacting at 50°C for 8 hours, the reaction was completed. The reacted solution was washed with 60 ml of ethyl acetate and 60 ml of deionized water, then dried with anhydrous magnesium sulfate, and the ethyl acetate was evaporated in vacuum to obtain a benzoxazine monomer solution. Phenolics in the resulting solution were removed by washing with 3M NaOH.

[0035] In the second step, ethanol swells the microporous basement membrane

[0036] The microporous membrane was immersed in ethanol solution with a mass fraction of 99% for 3 hours at room temperature to obtain a swollen microporous membrane. The microporous base film is polyvinylidene fluoride microporous film. The pore size is 0.45 microns, the porosi...

Embodiment example 3

[0041] The first step, synthesis of polybenzoxazine (BZ)

[0042] At 12°C, add 18ml of methylamine and 22ml of dioxane dropwise into a mixed solution of 32ml of formaldehyde and 85ml of dioxane to dissolve. After stirring evenly, add 100ml of 0.1mol / l bisphenol A solution, After reacting at 60°C for 9 hours, the reaction was completed. The obtained solution was washed with 50 ml of ethyl acetate and 50 ml of deionized water, dried over anhydrous magnesium sulfate, and the ethyl acetate was evaporated in vacuum to obtain a benzoxazine monomer solution. Phenolics in the resulting solution were removed by washing with 3M NaOH.

[0043]In the second step, ethanol swells the microporous basement membrane

[0044] The microporous membrane was immersed in ethanol solution for 4 hours at room temperature to obtain a swollen microporous membrane. The microporous base membrane is polytetrafluoroethylene microporous membrane. The pore diameter is 0.5 microns, the porosity is 90%, and...

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Abstract

The invention relates to a simple and green cross-linked composite anion exchange membrane and a preparation method thereof, belonging to the field of fuel cell membrane materials. The cross-linked composite membrane takes a microporous membrane as a base membrane, and holes are filled with a benzoxazine solution; the cross-linked anion exchange membrane is formed by means of ring-opening polymerization cross-linking. The synthesis method avoids the traditional chloromethylation and bromination processes of the membrane, and the cross-linked composite anion exchange membrane is prepared bby the green and safe method. According to the self-cross-linked anion membrane structure prepared by the method, polybenzoxazine in the membrane has double functions of ionic conduction and cross-linking,so that the membrane has better alkali stability and electrical conductivity; the preparation method has a great significance to study of balancing the conductivity and stability of the membrane.

Description

technical field [0001] The invention belongs to the field of fuel cell membrane materials, and relates to a cross-linked composite anion exchange membrane and a preparation method thereof. Background technique [0002] Fuel cells are an efficient, cheap, and environmentally friendly battery technology that can help solve energy surplus and environmental issues. Among the different types of fuel cells, alkaline anion-exchange membrane fuel cells (AAEMFCs) have received intense attention because of their advantages. For example: AAEMFCs can use cheap metals such as silver-nickel and cobalt as catalysts, so the production cost of AAEMFCs is lower than that of proton exchange membrane fuel cells (PEMFC), fuel cross-contamination is also limited, water management is easy, etc. [0003] Anion exchange membranes (AEMS) play an important role in AAEMFCs. The overall performance of AAEMFCs depends on the conductivity and chemical and mechanical stability of anions. The traditional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1041H01M8/1067H01M8/1069H01M8/1072C08G14/073
CPCC08G14/06H01M8/1041H01M8/1067H01M8/1069H01M8/1072H01M2008/1095Y02E60/50
Inventor 张凤祥阿克塔马艳娇马玲玲李旅巩守涛
Owner DALIAN UNIV OF TECH
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