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A composite organic phosphonic acid high temperature proton exchange membrane and its preparation method

A technology of proton exchange membrane and organic phosphonic acid is applied in the field of composite organic phosphonic acid high temperature proton exchange membrane and its preparation, which can solve the problems of complex process, difficult preparation of organic phosphonic acid polymer, inability to accurately control the content of phosphonic acid and the like

Active Publication Date: 2020-08-07
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example: (1) organic phosphonic acid polymers are difficult to prepare and are not suitable for large-scale production; (2) the film-making process is complex, such as the products released by BASF, and the process is very complicated; (3) the electrical conductivity is relatively low; (4) ) The content of phosphonic acid cannot be accurately controlled, and it is difficult to control the conductivity; (5) The mechanical strength is not enough, etc.

Method used

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  • A composite organic phosphonic acid high temperature proton exchange membrane and its preparation method
  • A composite organic phosphonic acid high temperature proton exchange membrane and its preparation method
  • A composite organic phosphonic acid high temperature proton exchange membrane and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] S-PBI and [(N-vinylimidazole-2-)methanol-vinylphosphonic acid dimethyl ester] copolymer B 1 Preparation of composite membrane

[0065]

[0066] (1) (N-vinylimidazole-2-)methanol-vinylphosphonic acid dimethyl ester copolymer B 1 (molar ratio 1:4) preparation

[0067] Under nitrogen protection, (N-vinylimidazole-2-)methanol (124.1mg, 1mmol) and dimethyl allylphosphonate (544.1mg, 4mmol) were successively added into a three-necked reaction flask, and deionized water ( 150mL) as a solvent, and then added a free radical chain initiator azobisisobutyronitrile (AIBN, 8.2mg, 0.05mmol). Stir (mechanical stirring) and heat to 80°C for reaction. After reacting for 24h, the solution became viscous, the reaction was stopped, and it was cooled to room temperature. Pour the reaction solution into ethyl acetate, and keep stirring, solids are precipitated, filtered, and vacuum-dried to obtain copolymer B 1 .

[0068] (2) S-PBI and Copolymer B 1 (Molar ratio 1:2) preparation of...

Embodiment 2

[0071] Py-PBI and (2-vinylimidazole-1-)methanol-diethyl allyl phosphonate] copolymer B 2 Preparation of composite membrane

[0072]

[0073] (1) (2-vinylimidazole-1-)methanol-diethyl allyl phosphonate copolymer B 2 (molar ratio 1:5) preparation

[0074] Under nitrogen protection, (2-vinylimidazole-1-)methanol (124.1mg, 1mmol) and diethyl allyl phosphonate (890.4mg, 5mmol) were successively added to a three-necked reaction flask, and deionized water ( 200mL) as a solvent, and then added a free radical chain initiator azobisisobutyronitrile (AIBN, 9.85mg, 0.06mmol). Stir (mechanical stirring) and heat to 80°C for reaction. After reacting for 24h, the solution became viscous, the reaction was stopped, and it was cooled to room temperature. Pour the reaction solution into ethyl acetate, and keep stirring, solids are precipitated, filtered, and vacuum-dried to obtain copolymer B 2 .

[0075] (2) Py-PBI and Copolymer B 2 (molar ratio 1:3) preparation of composite membrane ...

Embodiment 3

[0078] SO 2 -PBI and [(1-vinylpyrazole-4-)methanol-1,1-vinyl diphosphonic acid tetramethyl ester] copolymer B 3 Preparation of composite membrane

[0079]

[0080] (1) (1-vinylpyrazole-4-)methanol-1,1-vinyl diphosphonic acid tetramethyl ester copolymer B 3 (molar ratio 1:4)

[0081] preparation of

[0082] Under nitrogen protection, (1-vinylpyrazole-4-)methanol (124.1mg, 1mmol) and tetramethyl 1,1-vinyldiphosphonate (976.1mg, 4mmol) were sequentially added into a three-necked reaction flask, With deionized water (200 mL) as solvent, a free radical chain initiator azobisisobutyronitrile (AIBN, 9.85 mg, 0.06 mmol) was added. Stir (mechanical stirring) and heat to 80°C for reaction. After reacting for 24h, the solution became viscous, the reaction was stopped, and it was cooled to room temperature. Pour the reaction solution into ethyl acetate, and keep stirring, solids are precipitated, filtered, and vacuum-dried to obtain copolymer B 3 .

[0083] (2) SO 2 -PBI with ...

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Abstract

The invention provides a composite type organic phosphonic acid high-temperature proton exchange membrane and a preparation method thereof, and specifically provides an organic phosphonic acid high-temperature proton exchange membrane prepared by compounding the raw materials polybenzimidazole compound A and 'acid-base' type organic phosphonic acid polymer B, wherein the 'acid-base' type organic phosphonic acid polymer B is a copolymer formed by copolymerization of an alkaline alkene monomer C and an organic phosphonic acid monomer D. The composite organic phosphonic acid high-temperature proton exchange membrane provided by the invention has the advantages of high proton conductivity, high mechanical strength, high anti-oxidation stability and low loss rate of phosphonic acid, and is verysuitable for high-temperature proton exchange membrane fuel cells.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a composite organic phosphonic acid high-temperature proton exchange membrane and a preparation method thereof. Background technique [0002] Perfluorosulfonic acid membranes (PFSA, such as the Nafion membrane produced by Dupont) are widely used as proton exchange membranes in traditional proton exchange membrane fuel cells (PEMFC). 90°C, if the temperature is too high, the PEM will be dehydrated, the proton conductivity will drop sharply, and the battery performance will be seriously attenuated. The lower operating temperature brings various disadvantages to PEMFC, such as the catalyst is easily poisoned by impurity gases such as CO, and the water and heat management of the battery is complicated. These disadvantages have become the bottleneck of its development. Therefore, high-temperature proton exchange membrane fuel cells have become an inevitable development...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/103H01M8/1032H01M8/1048H01M8/1081
CPCH01M8/103H01M8/1032H01M8/1048H01M8/1081H01M2008/1095Y02E60/50
Inventor 胡金波何正标李铃春陈佳孝祝传贺邓玲
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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