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Crosslinked polybenzimidazole membrane material for high-temperature proton exchange membrane and preparation method of cross-linked polybenzimidazole membrane material

A technology of proton exchange membrane and polybenzimidazole, which is applied in the field of high temperature proton exchange membrane materials and its preparation, can solve the problems of deterioration of PBI membrane mechanical strength and reduction of PBI polymer chain interaction force, and achieve mechanical properties and Improved dimensional stability, improved proton conductivity, and simple cross-linking process

Active Publication Date: 2021-11-26
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the doping of PA also reduces the interaction force between PBI polymer chains, and the mechanical strength of PBI film deteriorates sharply with the increase of acid doping level.

Method used

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  • Crosslinked polybenzimidazole membrane material for high-temperature proton exchange membrane and preparation method of cross-linked polybenzimidazole membrane material
  • Crosslinked polybenzimidazole membrane material for high-temperature proton exchange membrane and preparation method of cross-linked polybenzimidazole membrane material
  • Crosslinked polybenzimidazole membrane material for high-temperature proton exchange membrane and preparation method of cross-linked polybenzimidazole membrane material

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Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: The preparation method of PBI-HCCP-10% high temperature proton exchange membrane material is as follows:

[0030] Add the polybenzimidazole resin to the N-methylpyrrolidone solution, heat and stir to dissolve it, and obtain a polymer solution with a mass fraction of 5 wt %; add hexachlorocyclotriphosphazene to the N-methylpyrrolidone solution, and stir to make It dissolves to obtain a solution with a mass fraction of 1% by weight; the molar ratio of the hexachlorocyclotriphosphazene and the imidazole ring in polybenzimidazole is controlled to be 1:60, that is, 10% of the imidazole ring undergoes a nucleophilic substitution reaction; the hexachlorocyclotriphosphazene Cyclotriphosphazene solution was added dropwise to the polybenzimidazole solution to finally obtain a uniform solution containing a cross-linking agent; the solution casting film-forming method was used to pour the uniform solution containing a cross-linking agent on a glass plate and heat at 80...

Embodiment 2

[0031] Embodiment 2: The preparation method of PBI-HCCP-20% high temperature proton exchange membrane material is as follows:

[0032] Add the polybenzimidazole resin to the N-methylpyrrolidone solution, heat and stir to dissolve it, and obtain a polymer solution with a mass fraction of 5 wt %; add hexachlorocyclotriphosphazene to the N-methylpyrrolidone solution, and stir to make It dissolves to obtain a solution with a mass fraction of 1% by weight; the molar ratio of the hexachlorocyclotriphosphazene and the imidazole ring in the polybenzimidazole is controlled to be 1:30, that is, 20% of the imidazole ring undergoes a nucleophilic substitution reaction; the hexachlorocyclotriphosphazene Cyclotriphosphazene solution was added dropwise to the polybenzimidazole solution to obtain a uniform solution containing a cross-linking agent; the solution casting film-forming method was used to cast the uniform solution containing a cross-linking agent on a glass plate and heated at 80°C...

Embodiment 3

[0033] Embodiment 3: The preparation method of PBI-ImCCP-10% high temperature proton exchange membrane material is as follows:

[0034] Add the polybenzimidazole resin to the N-methylpyrrolidone solution, heat and stir to dissolve it, and obtain a polymer solution with a mass fraction of 5 wt %; add hexachlorocyclotriphosphazene to the N-methylpyrrolidone solution, and stir to make It dissolves to obtain a solution with a mass fraction of 2wt%; add imidazole into the N-methylpyrrolidone solution, stir to dissolve it, and obtain a solution with a mass fraction of 2wt%; at 30°C, add 3g of the imidazole solution dropwise to In 5.1g of hexachlorocyclotriphosphazene solution, continue to stir for 30min after the dropwise addition to prepare imidazole-chlorocyclotriphosphazene solution; The molar ratio is 1:10, that is, 10% of the imidazole ring undergoes a nucleophilic substitution reaction; then the imidazole-chlorocyclotriphosphazene solution is added dropwise to the polybenzimid...

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Abstract

The invention discloses a cross-linked polybenzimidazole membrane material for a high-temperature proton exchange membrane and a preparation method of the cross-linked polybenzimidazole membrane material. According to the cross-linked polybenzimidazole membrane material, linear aryl ether type polybenzimidazole (OPBI) serves as a raw material, hexachlorocyclotriphosphazene (HCCP) or imidazole-chlorocyclotriphosphazene (ImCCP) serves as a cross-linking agent, the cross-linked polybenzimidazole membrane material is obtained through in-situ covalent cross-linking membrane forming through a casting method, and imidazole-chlorocyclotriphosphazene is obtained through a nucleophilic substitution reaction of imidazole and hexachlorocyclotriphosphazene. The preparation process is simple, the raw material cost is low, and the prepared membrane material with the cross-linked structure has the advantages of strong proton conduction capability, good chemical stability, excellent cell performance and the like after being doped with phosphoric acid, and has a wide application prospect in high-temperature fuel cells.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and fuel cells, and relates to a material with a crosslinked network structure for high-temperature proton exchange membranes and a preparation method thereof. Background technique [0002] High-temperature proton exchange membrane fuel cells (HT-PEMFCs) have the advantages of inhibiting CO poisoning, simple hydrothermal management, and little dependence on platinum-based catalysts due to their operating temperature above 100 °C. Clean energy conversion devices have received extensive attention. The widely studied phosphoric acid (PA)-doped polybenzimidazole (PBI) membrane has been developed as one of the most promising electrolytes for HT-PEMFC. PBI-based high-temperature proton exchange membrane fuel cells have several advantages, including high CO or SO 2 tolerance, virtually anhydrous working conditions and better heat utilization. So far, one of the key issues in obtaining the ex...

Claims

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Application Information

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IPC IPC(8): C08J5/22C08J3/24C08L79/04C08K5/5399H01M8/1072H01M8/103
CPCC08J5/2256C08J3/24H01M8/1072H01M8/103C08J2379/04C08K5/5399Y02E60/50
Inventor 肖敏孟超孟跃中王拴紧韩东梅
Owner SUN YAT SEN UNIV
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