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Process for preparing odified sulfonic acid lateral group polybenzimidazoles proton interchange films

A proton exchange membrane and benzimidazole technology, applied in the field of fuel cell material preparation, can solve the problems of reducing membrane mechanical properties, increasing flexibility, reducing service life, etc., to achieve improved output characteristics, high proton conductivity, softness and The effect of increased solubility

Inactive Publication Date: 2004-12-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, acid treatment of PBI produces swelling, which increases the flexibility of the PBI membrane, and PBI sulfonation produces a so-called "stable PBI" that is brittle and insoluble, which reduces the mechanical properties of the membrane and reduces the service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] 1). Mix 1 part of 2,3,4,5-tetraaminobenzene or 3,3',4,4'-tetraaminobiphenyl, 0.58 parts of 3-methanesulfonic acid-isophthalic acid and 0.31 parts of hexadiene Dissolve the acid in 22 parts of polyphosphoric acid to form a homogeneous mixture;

[0024] 2). In a nitrogen atmosphere, react at 150°C for 2 hours to obtain a brown solution;

[0025] 3). After neutralizing the brown solution with 2N sodium hydroxide solution to neutrality, filter and dry to obtain a crude dark yellow polycondensate;

[0026] 4). The crude polycondensate obtained above was dissolved in 1N concentrated sulfuric acid, precipitated in water, filtered, washed with water until neutral, and dried at 80°C for 24 hours under vacuum to obtain a pure polycondensate;

[0027] 5). Dissolving 12 parts of the above-mentioned pure polycondensate into 100 parts of dimethyl sulfoxide to obtain a uniform polycondensate solution;

[0028] 6). After pouring or casting the above polycondensate solution into a fil...

example 2

[0030] 1).1 part of 3,3',4,4'-tetraaminoketone, 0.78 part of 3-methanesulfonic acid-isophthalic acid, and 0.08 part of adipic acid are dissolved in 18 parts of polyphosphoric acid to form a uniform mixture ;

[0031] 2). In a nitrogen atmosphere, react at 150°C for 3 hours to obtain a light brown solution;

[0032] 3). After neutralizing the light brown solution with 1N sodium hydroxide solution to neutrality, filter and dry to obtain a crude yellow polycondensate;

[0033] 4). The crude polycondensate obtained above was dissolved in 1N concentrated sulfuric acid, precipitated in water, filtered, washed with water until neutral, and dried at 80°C for 24 hours under vacuum to obtain a pure polycondensate;

[0034] 5). Dissolving 10 parts of the above pure polycondensate into 100 parts of dimethylacetamide to obtain a uniform polycondensate solution;

[0035] 6). After pouring or casting the above polycondensate solution into a film, solidify at room temperature for 3 hours, t...

example 3

[0037] 1).1 part of 3,3',4,4'-tetraaminosulfone, 0.64 part of 3-ethanesulfonic acid-isophthalic acid, and 0.06 part of adipic acid are dissolved in 20 parts of polyphosphoric acid to form a uniform mixture ;

[0038] 2). In a nitrogen atmosphere, react at 200°C for 1 hour to obtain a brown solution;

[0039] 3). After neutralizing the brown solution with 1N sodium hydroxide solution to neutrality, filter and dry to obtain a crude yellow polycondensate;

[0040] 4). The crude yellow polycondensate obtained above was dissolved in 2N concentrated sulfuric acid, precipitated in water, filtered, washed with water until neutral, and dried at 80°C for 24 hours under vacuum to obtain a pure polycondensate;

[0041] 5). Dissolving 8 parts of the above pure polycondensate into 100 parts of dimethylformamide to obtain a uniform polycondensate solution;

[0042] 6). After pouring or casting the above polycondensate solution into a film, solidify at room temperature for 2 hours, then sol...

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PUM

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Abstract

The invention discloses a process for preparing modified sulfonic acid lateral group polybenzimidazole proton interchange film used in methyl alcohol fuel cells which comprises, subjecting fouramine group compounds, 3-alkyl-isophthalic acid and fat diprotonic acid to polycondensation in polyphosphoric acid system, obtaining homogeneous solution, subjecting the solution to neutralization, rinshing, filtering and dehumidification to obtain polycondensate crude product, dissolving the polycondensate crude product in strong inorganic acid, disposing in water to obtain the pure polycondensate product, dissolving the pure polycondensate in organic solvent to obtain homogeneous polycondensate solution, making films with pouring method or flowing method.

Description

technical field [0001] The invention belongs to the technical scope of fuel cell material preparation, and in particular relates to a method for preparing proton exchange membranes from modified sulfonic acid side group polybenzimidazoles used in direct methanol fuel cells. Background technique [0002] At present, the proton exchange membrane used in direct methanol fuel cells mostly uses perfluorocarbon polymer sulfonic acid ion exchange membrane (Nafion). When this perfluorocarbon polymer sulfonic acid proton exchange membrane is used in direct methanol fuel cells, there is a problem that methanol permeates from the anode to the cathode and hinders the electrochemical reaction of the cathode, which greatly limits the development and application of direct methanol fuel cells. To solve this problem, research on non-fluorine proton-conducting membranes has been carried out. [0003] Polybenzimidazole (PBI) is a class of highly thermally stable materials with a basic structu...

Claims

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Application Information

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IPC IPC(8): B01D69/00C08J5/22H01M4/88
CPCY02E60/12Y02E60/50
Inventor 谢晓峰徐景明毛宗强
Owner TSINGHUA UNIV
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