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Preparation method of sulfonated polyimide/chitosan composite proton conducting film

A technology of sulfonated polyimide and proton conductive membrane, which is applied in the parts, circuits, electrical components of fuel cells, etc., can solve the influence of proton conductivity, poor water stability of five-membered ring sulfonated polyimide, etc. The problem is to improve the vanadium ion resistance performance, good proton selectivity, and improve the vanadium resistance effect.

Active Publication Date: 2012-06-20
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are literatures (Journal of Chemical Industry and Engineering, 2004, 55: 230-233; Polymer, 2001, 42: 5097-5105; Polymer, 2001, 42: 359-373; Chemistry of Materials, 2004, 16: 2841-2843) It is reported that five-membered ring sulfonated polyimide has poor water stability, while six-membered ring sulfonated polyimide can effectively inhibit its hydrolysis due to the hydrolysis balance in water, and its hydrolytic stability is good, but it is stable under high temperature and high temperature. Strong oxidizing properties and hydrolysis will occur during long-term use
Literature (Journal of Membrane Science, 2006, 280: 321-329; Journal of Power Sources, 2009, 186: 286-292) reported that if acid-base pairs can be formed in the composite membrane, the stability of the membrane can be effectively improved, and the application It can effectively inhibit methanol permeation in direct methanol fuel cells; however, due to the formation of acid-base pairs, the proton conductivity will be affected

Method used

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  • Preparation method of sulfonated polyimide/chitosan composite proton conducting film
  • Preparation method of sulfonated polyimide/chitosan composite proton conducting film
  • Preparation method of sulfonated polyimide/chitosan composite proton conducting film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] in N 2 Under protection, add 1.0 mmol BDSA, 10 mL m-cresol, 2.0 mmol triethylamine to a 100 mL three-neck flask, stir continuously at room temperature until BDSA is completely dissolved, add 2.0 mmol NTDA, 0.49 g benzoic acid and 1.0 mmol ODA, and continue stirring After a few minutes, the temperature of the system was raised to 80 °C for 4 hours, and then to 180 °C for 20 hours, and the heating was stopped to obtain a viscous polymer solution. When the temperature dropped below 80 °C, add 5 mL of m-cresol to dilute the reaction solution, continue stirring for several minutes, then pour acetone into it to obtain a flocculent polymer precipitate, filter it, and wash the precipitate repeatedly with acetone for several times to remove the residual solvent and untreated solution. The reactants were then dried at 80°C for 20 hours.

[0035] The sulfonated polyimide of the obtained triethylamine salt type is dissolved in the organic solvent m-cresol, and is prepared into a m...

Embodiment 2

[0041] in N 2 Under protection, add 1.2 mmol BDSA, 10 mL m-cresol, and 2.4 mmol triethylamine to a 100 mL three-neck flask, stir continuously at room temperature until BDSA is completely dissolved, add 2.0 mmol NTDA, 0.49 g benzoic acid and 0.8 mmol ODA, and continue stirring After a few minutes, the temperature of the system was raised to 80 °C for 4 hours, and then to 180 °C for 20 hours, and the heating was stopped to obtain a viscous polymer solution. When the temperature dropped below 80 °C, add 5 mL of m-cresol to dilute the reaction solution, continue stirring for several minutes, then pour acetone into it to obtain a flocculent polymer precipitate, filter it, and wash the precipitate repeatedly with acetone for several times to remove the residual solvent and untreated solution. The reactants were then dried at 80°C for 20 hours.

[0042] The sulfonated polyimide of the obtained triethylamine salt type is dissolved in the organic solvent m-cresol, and is prepared into...

Embodiment 3

[0048] in N 2 Under protection, add 1.0 mmol BDSA, 10 mL m-cresol, 2.0 mmol triethylamine into a 100 mL three-neck flask, stir continuously at room temperature until BDSA is completely dissolved, add 2.0 mmol NTDA, 0.49 g benzoic acid and 1.0 mmol ODA, continue stirring for several Minutes later, the temperature of the system was raised to 80 °C for 4 hours, and then to 180 °C for 20 hours, and the heating was stopped to obtain a viscous polymer solution. When the temperature dropped below 80 °C, add 5 mL of m-cresol to dilute the reaction solution, continue stirring for several minutes, then pour acetone into it to obtain a flocculent polymer precipitate, filter it, and wash the precipitate repeatedly with acetone for several times to remove the residual solvent and untreated solution. The reactants were then dried at 80°C for 25 hours.

[0049] The sulfonated polyimide of the obtained triethylamine salt type is dissolved in the organic solvent m-cresol, and is prepared into...

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Abstract

The invention discloses a preparation method of a sulfonated polyimide / chitosan composite proton conducting film. The preparation method is characterized by comprising the following steps of: feeding 2,2'-disulfobenzidine, m-cresol and triethylamine into a reactor under the condition of nitrogen protection, and stirring until solid substances are dissolved; adding 1,4,5,8-naphthalene tetracarboxylic dianhydride, benzoic acid and 4,4'-diamido diphenyl ether, heating and reacting, and cooling to below 80 DEG C; pouring into acetone for precipitation, filtering, washing precipitate with acetone,and drying to obtain triethylamine salt type sulfonated polyimide; dissolving triethylamine salt type sulfonated polyimide in an organic solvent, casting and filming, soaking, washing and drying to obtain a protonated sulfonated polyimide film; and preparing the sulfonated polyimide / chitosan composite proton conducting film by using soaking and self-assembly chitosan solution crosslinking methods. The sulfonated polyimide / chitosan composite proton conducting film prepared by using the preparation method has good application prospect in the aspects of a full-vanadium redox liquid flow battery and a fuel battery.

Description

technical field [0001] The invention belongs to a method for preparing a conductive film used in batteries, and relates to a method for preparing a sulfonated polyimide / chitosan composite proton conductive film. The prepared sulfonated polyimide / chitosan composite proton-conducting membrane can be applied to technical fields such as all-vanadium redox flow batteries, fuel cells, and the like. Background technique [0002] Vanadium Redox Flow Battery (VRB for short) is a clean, efficient and green energy storage system. Because of its high efficiency, long service life, low production and operation costs, fast charging, easy capacity increase, and low price, it is widely used in energy storage equipment for solar and wind power generation, emergency power systems, power station energy storage, and electric vehicles. etc. The proton-conducting membrane is one of the core components of VRB. Currently, Nafion produced by DuPont is widely used. ò A series of perfluorosulfonic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J5/22C08L79/08C08L5/08C08G73/10H01M8/02H01M2/16H01M8/0293
CPCY02E60/12Y02E60/50
Inventor 张亚萍岳明珠王磊
Owner SOUTHWEAT UNIV OF SCI & TECH
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