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Coumarin-based photocyclized crosslinked sulfonated polyimide proton exchange membrane and preparation method thereof

A technology of sulfonated polyimide and proton exchange membrane, which is applied in the field of functional polymer materials and electrochemistry, and can solve the problem of low proton conductivity, reduced application potential of sulfonated polyimide, dimensional stability, and decreased mechanical strength problems such as high proton conductivity, good dimensional stability, and mild process conditions

Active Publication Date: 2018-09-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the degree of sulfonation of sulfonated polyimide is low, the proton conductivity is low. When the degree of sulfonation reaches a certain value, its dimensional stability and mechanical strength are seriously reduced, which also reduces the performance of sulfonated polyimide. Application Potential of Amines

Method used

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  • Coumarin-based photocyclized crosslinked sulfonated polyimide proton exchange membrane and preparation method thereof
  • Coumarin-based photocyclized crosslinked sulfonated polyimide proton exchange membrane and preparation method thereof
  • Coumarin-based photocyclized crosslinked sulfonated polyimide proton exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Step (1): Synthesis of sulfonated polyimides containing hydroxyl groups with a sulfonation degree of 80%:

[0045] Weigh 0.6957g (4mmol) of 2,2-'benzidine disulfonic acid (BDSA) into a 250mL three-neck flask, add 20mL of m-cresol and 1.67mL (12mmol) of triethylamine. The right end of the three-necked flask is fed with nitrogen gas through a curved pipe, the left end is connected with a reflux condenser, and then passed through a drying pipe into a conical flask filled with water for testing the nitrogen flow rate, and the middle port is connected with a mechanical stirring device. The rotation speed was adjusted to 100r / min, and the temperature was raised to 80°C. After about 30 minutes, BDSA dissolved to obtain a yellow transparent liquid, which was naturally cooled to room temperature. Weigh 2.7936g (10mmol) 1,4,5,8-naphthalene tetracarboxylic dianhydride (NTDA), 2.9898g (6mmol) 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (6FAP ), 2.4547g (20mmol) of benzoic a...

Embodiment 2

[0055] Step (1): Synthesis of a hydroxyl-containing sulfonated polyimide with a sulfonation degree of 100%:

[0056] Weigh 0.6957g (5mmol) BDSA into a 250mL three-neck flask, add 20mL m-cresol and 1.67mL (12mmol) triethylamine. The right end of the three-necked flask is fed with nitrogen gas through a curved pipe, the left end is connected with a reflux condenser, and then passed through a drying pipe into a conical flask filled with water for testing the nitrogen flow rate, and the middle port is connected with a mechanical stirring device. The rotation speed was adjusted to 100r / min, and the temperature was raised to 80°C. After about 30 minutes, BDSA dissolved to obtain a yellow transparent liquid, which was naturally cooled to room temperature. Weigh 2.7936g (10mmol) NTDA, 2.9898g (5mmol) 6FAP, and 2.4547g (20mmol) benzoic acid, add them to the three-necked flask in turn, add 25mL of m-cresol to make the solid content between 16% and 17%, and stir for 30min. Raise the te...

Embodiment 3

[0066] Step (1): Synthesis of sulfonated polyimide containing hydroxyl groups with a sulfonation degree of 120%:

[0067] Weigh 0.6957g (6mmol) BDSA into a 250mL three-neck flask, add 20mL m-cresol and 1.67mL (12mmol) triethylamine. The right end of the three-necked flask is fed with nitrogen gas through a curved pipe, the left end is connected with a reflux condenser, and then passed through a drying pipe into a conical flask filled with water for testing the nitrogen flow rate, and the middle port is connected with a mechanical stirring device. The rotation speed was adjusted to 100r / min, and the temperature was raised to 80°C. After about 30 minutes, BDSA dissolved to obtain a yellow transparent liquid, which was naturally cooled to room temperature. Weigh 2.7936g (10mmol) of NTDA, 2.9898g (4mmol) of 6FAP, and 2.4547g (20mmol) of benzoic acid, add them to the three-necked flask in turn, add 25mL of m-cresol to make the solid content between 16% and 17%, and stir for 30min....

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Abstract

The invention relates to a coumarin-based photocyclized crosslinked sulfonated polyimide proton exchange membrane and a preparation method thereof. The proton exchange membrane comprises the followingcomponents in parts by weight: 1 part of sulfonated polyimide containing a photosensitive group, 0.005-0.05 part of a photoinitator, 0.005-0.05 part of a photo-initiation auxiliary and 20-100 parts of an organic solvent; and the sulfonated polyimide containing the photosensitive group comprises the following components in parts by mol: 1 part of dianhydride, 0.2-2 parts of sulfonated diamine, 0.2-2 parts of unsulfonated diamine, 0.8-1.2 parts of a catalyst and 0.2-10 parts of a photosensitizer. Compared with the prior art, the coumarin-based photocyclized crosslinked sulfonated polyimide proton exchange membrane has the advantages of high proton conductivity, high mechanical strength and good hydrolysis and chemical stability, sources of raw materials are extensive, preparation technologycontrollability is good, and production cost can be effectively saved, thereby having a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of functional polymer materials and electrochemistry, and relates to a coumarin-based photocyclization cross-linked sulfonated polyimide proton exchange membrane and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cells (PEMFCs) are fuel cells with proton exchange membranes as electrolytes, and are one of five types of fuel cells. It is currently the most mature technology in the world that can chemically react hydrogen with oxygen in the air to generate water and release electricity. It has the advantages of high energy efficiency, low emissions, and environmental friendliness. As the core of a fuel cell, the properties of the electrolyte are directly related to key performances such as power generation efficiency and service life of the fuel cell. The proton conductivity, mechanical properties, and dimensional stability of proton exchange membrane (PEM) have a dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1041H01M8/1067
CPCH01M8/1041H01M8/1067Y02E60/50Y02P70/50
Inventor 潘海燕陈思琦金明常志宏
Owner TONGJI UNIV