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Block sulfonated polyimide with micropores as well as preparation method and application thereof

A technology for sulfonating polyimide and imide, which is applied in the field of fuel cells, can solve problems such as poor solubility, and achieve the effects of increasing transparency, increasing ion transmission channels, and improving proton conductivity.

Active Publication Date: 2022-05-06
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Polyimide is considered to be a good choice to replace proton exchange membranes due to its excellent mechanical properties, thermal stability and gas barrier ability of thin film materials due to its imide structure, but poor solubility is one of the most serious challenges of polyimides. one

Method used

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  • Block sulfonated polyimide with micropores as well as preparation method and application thereof
  • Block sulfonated polyimide with micropores as well as preparation method and application thereof
  • Block sulfonated polyimide with micropores as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Synthesis of imide prepolymer (II) containing anhydride end groups.

[0044]Add 8ml of m-cresol solution in a 50ml double-necked flask, under argon protection, add 1.23mmol 4,4'-diaminodiphenyl ether (0.2454g), 1.32mmol 1,2,4,5-cyclohexane under mechanical stirring Alkanetetracarboxylic dianhydride (0.2959g), and then add 0.38ml dehydrating agent isoquinoline, and stir for 30min to form a homogeneous phase.

[0045] The above reaction system was heated to 80° C. for 4 hours, and then heated to 180° C. for 18 hours to prepare an imide prepolymer containing acid anhydride end groups with a degree of polymerization of 20 and Mn=8000-8200.

[0046] 2. Synthesis of imide prepolymer (I) containing amino end groups.

[0047] Add 8ml of m-cresol solution into a 50ml two-necked flask, under argon protection, add 1.84mmol 4,4'-diamino-2,2'-disulfonic acid-biphenyl (0.6618g) under mechanical stirring, and then add 0.6ml triethylamine facilitates dissolution. When 4,4'-diamin...

Embodiment 2

[0057] 1. Synthesis of imide prepolymer (II) containing anhydride end groups.

[0058] Add 8ml of m-cresol solution in a 50ml two-necked flask, under argon protection, add 1.23mmol 4,4'-diaminodiphenyl ether (0.2454g), 1.27mmol 1,2,4,5-cyclohexane under mechanical stirring Alkanetetracarboxylic dianhydride (0.2846g), and then add 0.38ml dehydrating agent isoquinoline, and stir for 30min to form a homogeneous phase.

[0059] The above reaction system was heated to 80° C. for 4 hours, and then heated to 180° C. for 18 hours to prepare an imide prepolymer containing acid anhydride end groups with a degree of polymerization of 40 and Mn=16000-16400.

[0060] 2. Synthesis of imide prepolymer (I) containing amino end groups.

[0061] Add 8ml of m-cresol solution into a 50ml two-necked flask, under argon protection, add 1.84mmol 4,4'-diamino-2,2'-disulfonic acid-biphenyl (0.6618g) under mechanical stirring, and then add 0.6ml triethylamine facilitates dissolution. When 4,4'-diamin...

Embodiment 3

[0073] 1. Synthesis of imide prepolymer (II) containing anhydride end groups.

[0074] Add 8ml of m-cresol solution in a 50ml double-necked flask, under argon protection, add 1.23mmol 4,4'-diaminodiphenyl ether (0.2454g), 1.26mmol 1,2,4,5-cyclohexane under mechanical stirring Alkanetetracarboxylic dianhydride (0.2825g), and then add 0.38ml dehydrating agent isoquinoline, and stir for 30min to form a homogeneous phase.

[0075] The above reaction system was heated to 80° C. for 4 hours, and then heated to 180° C. for 18 hours to prepare an imide prepolymer containing acid anhydride end groups with a degree of polymerization of 60 and Mn=24000-24600.

[0076] 2. Synthesis of imide prepolymer (I) containing amino end groups.

[0077] Add 8ml of m-cresol solution into a 50ml two-necked flask, under argon protection, add 1.84mmol 4,4'-diamino-2,2'-disulfonic acid-biphenyl (0.6618g) under mechanical stirring, and then add 0.6ml triethylamine facilitates dissolution. When 4,4'-dia...

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Abstract

The invention provides block sulfonated polyimide with micropores. The proton exchange membrane is a block polymer obtained by carrying out an imide dehydration condensation reaction on an amino-terminated sulfonated imide prepolymer represented by a structural formula (I) and an anhydride-terminated imide prepolymer represented by a structural formula (II) in a molar ratio of (4-6): (6-4). When the proton exchange membrane is used as a proton exchange membrane of a proton exchange membrane fuel cell, the proton conductivity of the membrane can be improved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a proton exchange membrane for a fuel cell, in particular to a sulfonated polyimide proton exchange membrane with a microporous structure. Background technique [0002] Polyimide has excellent mechanical properties, thermal properties and electrical properties. It is an important special polymer material and is widely used in many fields such as machinery, electrical appliances, and aerospace. Different application fields have different requirements for the properties of polyimide films. In the applications of flexible circuit boards, flexible solar cells, flexible display substrates, etc., polyimide film materials need to have low thermal expansion coefficient and excellent dimensional stability. and high heat resistance. [0003] With the rapid development of renewable energy, especially the number of energy conversion studies on proton exchange membrane fuel cells (PEMFC) ...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08J5/22C08L79/08C08J9/28H01M8/1081H01M8/103H01M8/1065
CPCC08G73/1078C08G73/1064C08G73/105C08G73/1042C08G73/1007C08J5/2256C08J9/286H01M8/1081H01M8/103H01M8/1065C08J2379/08C08J2205/044Y02E60/50
Inventor 王超杨洁刘鑫
Owner ZHONGBEI UNIV
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