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Preparation method of cross-linking polypyrrolone-sulfonated polyimide segmented copolymer proton exchange membrane

A technology of sulfonated polyimide blocks and proton exchange membranes, which is applied in the field of proton exchange membranes, can solve the problems of poor resistance to free radical oxidation, low proton conductivity, and decreased stability, and achieve improved resistance to free radicals. The effect of improving the oxidation performance, improving the overall performance and inhibiting the swelling rate

Inactive Publication Date: 2016-02-17
张可可 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sulfonated polyimide proton exchange membrane has good mechanical properties and thermal stability, but its proton conductivity is not high and requires a high degree of sulfonation, which leads to excessive swelling of the membrane, especially in the plane direction degree, resulting in a decrease in the stability of the membrane
In addition, the sulfonated polyimide proton exchange membrane still has the problem of poor resistance to free radical oxidation, which needs to be solved urgently

Method used

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  • Preparation method of cross-linking polypyrrolone-sulfonated polyimide segmented copolymer proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (a) Synthesis of NTDA-terminated polypyrrolene prepolymer

[0028] In a 100mL dry three-necked flask, 10mmol of 3,3'-diaminobenzidine DAB, 10.5mmol of 1,4,5,8-naphthalene tetracarboxylic anhydride NTDA, 22mmol of benzoic acid, 3mL of isoquinoline and 40mL of m- cresol, nitrogen protection and magnetic stirring; 1h later, the temperature was raised to 80°C for 4h, 180°C for 20h, after the reaction was completed, the temperature was lowered to 80°C and quickly poured into 150mL of methanol to obtain a large amount of solid precipitation. After the product was repeatedly washed with methanol, the polymer was collected by suction filtration and dried in a vacuum oven at 160°C for 20 hours for use;

[0029] (b) Synthesis of BAPBDS end-capped sulfonated polyimide prepolymer

[0030] In a 100mL dry three-neck flask, add 1.6mmol 4,4'-bis(4-aminophenoxy)biphenyl-3,3'disulfonic acid aniline BAPBDS, 12.5mLm-cresol and 0.7mL triethylamine in sequence, Nitrogen protection and magn...

Embodiment 2

[0038] Similar to Example 1, the only difference is that 12 mmol of NTDA is used in step (a).

Embodiment 3

[0040] Similar to Example 1, the only difference is that 11 mnol of NTDA is used in step (a).

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Abstract

The invention provides a preparation method of a cross-linking polypyrrolone-sulfonated polyimide segmented copolymer proton exchange membrane. The method includes the steps that 3,3'-diaminobenzidine and excess 1,4,5,8-naphthalene tetracarboxylic dianhydride react to obtain anhydride-naphthalene-capped prepolymer, then 1,4,5,8-naphthalene tetracarboxylic dianhydride and excess 2,2'-bis(4-sulfonic phenoxy)benzidine react to obtain amino-capped prepolymer, finally, the anhydride-naphthalene-capped prepolymer and the amino-capped prepolymer are copolymerized according to equal mole to obtain a high-molecular-weight polypyrrolone-sulfonated polyimide segmented copolymer, and after membrane formation and prone exchange, polyphosphoric acid is used for further cross-linking so that the cross-linking polypyrrolone-sulfonated polyimide segmented copolymer proton exchange membrane can be obtained. The prepared cross-linking polypyrrolone-sulfonated polyimide segmented copolymer proton exchange membrane has the advantages of being high in mechanical strength and conductivity, low in swelling ratio and good in free radical oxidization resistance.

Description

technical field [0001] The invention belongs to the field of proton exchange membranes, and more specifically, the invention relates to a preparation method of a cross-linked polypyrrole-sulfonated polyimide block copolymer proton exchange membrane. Background technique [0002] The proton exchange membrane is the core component of the fuel cell, which must have high proton conductivity, excellent mechanical properties, good thermal stability and chemical stability. Sulfonated polyimide proton exchange membrane has good mechanical properties and thermal stability, but its proton conductivity is not high and requires a high degree of sulfonation, which leads to excessive swelling of the membrane, especially in the plane direction degree, resulting in a decrease in the stability of the membrane. In addition, the sulfonated polyimide proton exchange membrane still has the problem of poor resistance to free radical oxidation, which needs to be solved urgently. [0003] Therefo...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08G73/10C08J5/22C08L87/00
Inventor 张可可顾珂王琳琳
Owner 张可可
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