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Preparation of novel covalent cross-linking polybenzimidazole proton exchange membrane

A technology of benzimidazole membrane and proton exchange membrane, which is applied in the field of preparation of new cross-linked polybenzimidazole membrane, can solve the problems that restrict the wide commercialization of PBI membrane, low mechanical strength and high swelling, and achieve simple and feasible preparation process, High mechanical strength, effect of improving anti-oxidation performance

Inactive Publication Date: 2014-11-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, more researches are on phosphoric acid (PA) doped PBI membranes. A high doping level will increase the proton conductivity of PBI membranes, but problems such as low mechanical strength and high swelling caused by high doping seriously restrict PA doping. Widespread commercialization of PBI membranes

Method used

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  • Preparation of novel covalent cross-linking polybenzimidazole proton exchange membrane
  • Preparation of novel covalent cross-linking polybenzimidazole proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add a certain amount of polybenzimidazole resin into the N,N-dimethylacetamide solution and dissolve it with slight heat to obtain a polymer with a mass fraction of 0.1wt.%-50wt.% (preferably 0.1wt.%-10wt.%) solution, and then add 1,2-dibromoethane with a mass fraction of 0.1wt.%-50wt.% (preferably 0.1wt.%-10wt.%), and magnetically stir to make it evenly mixed; vacuum filtration, A uniform proton exchange membrane solution containing a cross-linking agent is obtained; the cast film forming method is used, the temperature is raised, and the solvent is volatilized to remove the solvent to obtain the desired cross-linked proton exchange membrane.

Embodiment 2

[0024] Add a certain amount of polybenzimidazole resin into the N,N-dimethylacetamide solution and dissolve it with slight heat to obtain a polymer with a mass fraction of 0.1wt.%-50wt.% (preferably 0.1wt.%-10wt.%) solution, and then add epichlorohydrin with a mass fraction of 0.1wt.%-50wt.% (preferably 0.1wt.%-10wt.%), and magnetically stir to make it evenly mixed; The proton exchange membrane solution of the linking agent; the casting film forming method is adopted, the temperature is raised, and the solvent is volatilized to remove the solvent to obtain the required cross-linked proton exchange membrane.

Embodiment 3

[0026] Add a certain amount of polybenzimidazole resin into the N,N-dimethylacetamide solution and dissolve it with slight heat to obtain a polymer with a mass fraction of 0.1wt.%-50wt.% (preferably 0.1wt.%-10wt.%) solution, and then add 1,2,5,6-dioxirane with a mass fraction of 0.1wt.%-50wt.% (preferably 0.1wt.%-10wt.%), and magnetically stir to make it evenly mixed; Suction filtration under reduced pressure to obtain a uniform proton exchange membrane solution containing a cross-linking agent; adopt a tape-casting film-forming method, program temperature rise, and evaporate the solvent to obtain the desired cross-linked proton exchange membrane.

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Abstract

The invention relates to a preparation method of a covalent cross-linking polybenzimidazole high-temperature proton exchange membrane. The preparation method comprises the following steps: carrying out covalent cross-linking by taking polybenzimidazole resin as a raw material and taking bivariate or multivariate halides and epoxy compounds as cross-linking agents, and forming the membrane through a solvent volatilization method. The covalent cross-linking polybenzimidazole high-temperature proton exchange membrane prepared by utilizing the method disclosed by the invention has the advantages of better dimensional stability, thermodynamic stability and chemical stability, high phosphoric acid doping level and higher proton conducting property and can be used within a range of 20-200 DEG C. The preparation process disclosed by the invention is simple and low in raw material cost; and the prepared cross-linking proton exchange membrane has potential of being applied to a high-temperature fuel cell.

Description

technical field [0001] The invention belongs to the field of preparation of proton exchange membranes for high-temperature fuel cells, in particular to a preparation method of novel cross-linked polybenzimidazole membranes. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) are power generating devices that directly convert chemical energy into electrical energy through electrochemical reactions. Due to the characteristics of high efficiency, fast start-up and low pollution, the development of PEMFCs has attracted much attention since the end of the nineteenth century. The proton exchange membrane is an important part of the membrane electrode of the fuel cell, and has the following main functions: (1) as a medium for proton transfer, (2) as a barrier to separate reactant gases, (3) as a carrier for cell catalysts. At present, the commercialized perfluorosulfonic acid membrane (PFSA), such as the Nafion membrane produced by DuPont, exhibits high prot...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08J3/24C08L79/04C08K5/02C08K5/1515C08K5/1545H01M8/10H01M8/1018H01M8/1069
CPCY02E60/50
Inventor 汪中明葛瑞祥李明磊
Owner BEIJING UNIV OF CHEM TECH
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