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Process for preparing modified sulfuric acid lateral group polybenzimidazoles proton interchange films

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

Inactive Publication Date: 2006-04-19
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) 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 adipic acid Dissolve 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) neutralize the brown solution with 2N sodium hydroxide solution to neutrality, filter and dry to obtain the crude dark yellow polycondensate;

[0026] 4) dissolving the crude polycondensate obtained above in 1N sulfuric acid, precipitating in water, filtering, washing with water until neutral, and drying at 80° C. under vacuum for 24 hours to obtain a pure polycondensate;

[0027] 5) Dissolving 12 parts of the pure product of the above 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 film, solidify at room temperat...

example 2

[0030] 1) Dissolve 1 part of 3,3',4,4'-tetraaminodiphenyl ether, 0.78 part of 3-propanesulfonic acid-isophthalic acid, and 0.1 part of adipic acid in 18 parts of polyphosphoric acid to form a homogeneous mixture ;

[0031] 2) In an argon atmosphere, react at 250° C. for 1 hour to obtain a dark brown solution;

[0032] 3) neutralize the dark brown solution with 2N sodium hydroxide solution to neutrality, filter and dry to obtain a crude yellow polycondensate;

[0033] 4) Dissolving the crude yellow polycondensate obtained above in 1N sulfuric acid, precipitating in water, filtering, washing with water until neutral, and drying at 80° C. under vacuum for 24 hours to obtain a pure polycondensate;

[0034] 5) Dissolving 12 parts of the pure product of the above 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 2 hours,...

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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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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M4/88B01D69/00C08J5/22
CPCY02E60/50Y02E60/12
Inventor 谢晓峰徐景明毛宗强
Owner TSINGHUA UNIV
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