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Sulfonated polybenzimidazole cross-linked membrane and preparation method thereof

A technology of sulfonated polybenzimidazole and cross-linking agent, which is applied in the field of functional polymer materials and electrochemistry, can solve the problems of poor mechanical strength and dimensional stability, high price, high fuel permeability, etc., and achieve improved resistance to chemical decomposition, Effect of improving proton conductivity and reducing fuel permeability

Inactive Publication Date: 2017-05-31
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used proton exchange membrane is the perfluorinated proton exchange membrane, but its high price, poor mechanical strength and dimensional stability, and high fuel permeability limit its wide application.

Method used

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  • Sulfonated polybenzimidazole cross-linked membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Cross-linked film SPBI-10-0.5 (the content of amino group is 10%, and the content of graphene oxide is 0.5%)

[0030] (1) Add 150g of polyphosphoric acid into a completely dry three-necked flask, vacuum until there are no bubbles, add 6g of phosphorus pentoxide after heating to 150°C, connect the gas inlet, drying tube, gas outlet, reflux condenser and mechanical stirring In the container, pass inert gas and start stirring until phosphorus pentoxide dissolves. Add 2.1643g 3,3'-diaminobenzidine, 2.4628g 2-sulfonic acid terephthalic acid and 0.1848g 2-aminoterephthalic acid, raise the temperature to 220°C, react for 22 hours, and polycondense at high temperature to obtain amino side chain Sulfonated polybenzimidazole (SPBI-10). Pour it into deionized water while it is hot, and stir while pouring to obtain golden red strips. Filter and wash with water until neutral. Then soak in 10% (mass fraction) NaOH for 24 hours, wash with water until neutral, and dry in an oven at ...

Embodiment 2

[0035] Cross-linked film SPBI-10-2 (the content of amino group is 10%, and the content of graphene oxide is 2.0%)

[0036] (1) Add 150g of polyphosphoric acid into a completely dry three-necked flask, vacuum until there are no bubbles, add 6g of phosphorus pentoxide after heating to 150°C, connect the gas inlet, drying tube, gas outlet, reflux condenser and mechanical stirring In the container, pass inert gas and start stirring until phosphorus pentoxide dissolves. Add 2.1643g 3,3'-diaminobenzidine, 2.4628g 2-sulfonic acid terephthalic acid and 0.1848g 2-aminoterephthalic acid, raise the temperature to 220°C, react for 22 hours, and polycondense at high temperature to obtain amino side chain Sulfonated polybenzimidazole (SPBI-10). Pour it into deionized water while it is hot, and stir while pouring to obtain golden red strips. Filter and wash with water until neutral. Then soak in 10% (mass fraction) NaOH for 24 hours, wash with water until neutral, and dry in an oven at 80...

Embodiment 3

[0041] Cross-linked film SPBI-10-5 (the content of amino group is 10%, and the content of graphene oxide is 5.0%)

[0042] (1) Add 150g of polyphosphoric acid into a completely dry three-necked flask, vacuum until there are no bubbles, add 6g of phosphorus pentoxide after heating to 150°C, connect the gas inlet, drying tube, gas outlet, reflux condenser and mechanical stirring In the container, pass inert gas and start stirring until phosphorus pentoxide dissolves. Add 2.1643g 3,3'-diaminobenzidine, 2.4628g 2-sulfonic acid terephthalic acid and 0.1848g 2-aminoterephthalic acid, raise the temperature to 220°C, react for 22 hours, and polycondense at high temperature to obtain amino side chain Sulfonated polybenzimidazole (SPBI-10). Pour it into deionized water while it is hot, and stir while pouring to obtain golden red strips. Filter and wash with water until neutral. Then soak in 10% (mass fraction) NaOH for 24 hours, wash with water until neutral, and dry in an oven at 80...

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Abstract

The present invention belongs to the technical field of functional polymer materials and electrochemistry and in particular relates to a sulfonated polybenzimidazole cross-linked proton exchange membrane and a preparation method thereof. In the present invention, a synthesized side chain is provided with sulfonated polybenzimidazole with a cross-linked group of an amino group, and a membrane liquid is prepared from a product obtained above, a graphene oxide cross-linking agent is added, and reacts with the amino group, and a sulfonated polybenzimidazole polymer is subjected to cross-linking in a membrane forming process. The cross-linked membrane has the good mechanical property, and relatively high proton conduction rate, hydrolytic stability and anti-oxidation stability. The method provided by the present invention is good in control performance; and compared with a conventional sulfonated polybenzimidazole membrane, the sulfonated polybenzimidazole cross-linked proton exchange membrane has the high mechanical strength, high anti-hydrolysis and anti-oxidation performances, good dimensional stability, high proton conduction rate, and a wide application prospect in polymer electrolyte membrane fuel cells.

Description

technical field [0001] The invention belongs to the technical field of functional polymer materials and electrochemistry, and specifically relates to a sulfonated polybenzimidazole cross-linked membrane and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a device that directly converts chemical energy stored in fuel and oxidant into electrical energy through an electrochemical reaction. It has the advantages of environmental friendliness and high energy conversion rate, and is expected to be used in households in the near future Popular areas such as power supplies, electric vehicles, and portable electronics. Inside the fuel cell, the proton exchange membrane provides a channel for the migration and transport of protons, so that the protons pass through the membrane from the anode to the cathode, and form a circuit with the electron transfer of the external circuit to provide current to the outside world. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/103H01M8/1072
CPCH01M8/103H01M8/1072Y02E60/50
Inventor 潘海燕胡建辉
Owner TONGJI UNIV
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