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Preparation method and application of ammonium polybenzimidazole, alkaline ion exchange membrane of ammonium polybenzimidazole, and ionomer of ammonium polybenzimidazole

A kind of polybenzimidazole, ammonium technology, used in the preparation of polybenzimidazole electrolyte with long-chain ammonium salt and its alkaline ion exchange membrane and ionomer, preparation of ionomer, ammonium polybenzimidazole It can solve the problems of difficult membrane electrode preparation, low ionic conductivity, poor chemical stability, etc., and achieve the effects of high dry film toughness and chemical stability, high ionic conductivity, and good film-forming properties.

Active Publication Date: 2022-03-11
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no literature report on polybenzimidazole basic ion exchange membranes with cyclohexane structure.
[0004] In fuel cells, water electrolysis and other related electrochemical devices, alkaline ion exchange membranes have key problems such as poor mechanical properties, poor chemical stability, and low ion conductivity, and traditional polybenzimidazole electrolytes can only be dissolved in In solvents with high boiling points above 100°C, it brings great difficulties to the preparation of membrane electrodes

Method used

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  • Preparation method and application of ammonium polybenzimidazole, alkaline ion exchange membrane of ammonium polybenzimidazole, and ionomer of ammonium polybenzimidazole
  • Preparation method and application of ammonium polybenzimidazole, alkaline ion exchange membrane of ammonium polybenzimidazole, and ionomer of ammonium polybenzimidazole
  • Preparation method and application of ammonium polybenzimidazole, alkaline ion exchange membrane of ammonium polybenzimidazole, and ionomer of ammonium polybenzimidazole

Examples

Experimental program
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Effect test

Embodiment 1

[0083] Add polyphosphoric acid in a stirred reactor, under N 2 Under protection, phosphorus pentoxide was added and stirred until the system was clarified. Add 3,3'-diaminobiphenyltetramine, 1,4-cyclohexanedicarboxylic acid and pimelic acid respectively, heat and stir to dissolve. The temperature was raised to 150°C and the reaction was stirred for 1 hour, then the temperature was raised to 185°C for reaction, and the polymerization was terminated when the reaction liquid was very viscous. Pour the reaction solution into deionized water to settle, add excess NaHCO 3 Stir to neutralize. Filter and wash the polymer with deionized water until neutral. Dry to obtain polybenzimidazole. Among them, the total number of moles of 1,4-cyclohexanedicarboxylic acid and pimelic acid and the number of moles of 3,3'-diaminobiphenyltetramine are 1:1,3,3'-diaminobiphenyltetramine The solution concentration of 1,4-cyclohexanedicarboxylic acid and pimelic acid is 20wt%, and the mass fractio...

Embodiment 2

[0090] Add 85% polyphosphoric acid in a stirred reactor, under N 2 Under protection, phosphorus pentoxide was added and stirred until the system was clarified. Add 3,3'-diaminobiphenyltetramine, 1,4-cyclohexanedicarboxylic acid and isophthalic acid respectively, heat and stir to dissolve. The temperature was raised to 150°C and the reaction was stirred for 8 hours, then the temperature was raised to 180°C for reaction, and the polymerization was terminated when the reaction liquid was very viscous. Pour the reaction solution into deionized water to settle, add excess NaHCO 3 Stir to neutralize. Filter and wash the polymer with deionized water until neutral. Dry to obtain polybenzimidazole. Among them, the total number of moles of 1,4-cyclohexanedicarboxylic acid and isophthalic acid and the number of moles of 3,3'-diaminobiphenyltetramine are 1:1,3,3'-diaminobiphenyltetramine The solution concentration of amine, 1,4-cyclohexanedicarboxylic acid and isophthalic acid is 10w...

Embodiment 3

[0097] Add polyphosphoric acid in a stirred reactor, under N 2 Under protection, phosphorus pentoxide was added and stirred until the system was clarified. Add 3,3'-diaminobiphenyltetramine, 1,4-cyclohexanedicarboxylic acid and isophthalic acid respectively, heat and stir to dissolve. The temperature was raised to 160°C and the reaction was stirred for 3 hours, then the temperature was raised to 185°C for reaction, and the polymerization was terminated when the reaction liquid was very viscous. Pour the reaction solution into deionized water to settle, add excess NaHCO 3 Stir to neutralize. Filter and wash the polymer with deionized water until neutral. Dry to obtain polybenzimidazole. Among them, the total number of moles of 1,4-cyclohexanedicarboxylic acid and isophthalic acid and the number of moles of 3,3'-diaminobiphenyltetramine are 1:1,3,3'-diaminobiphenyltetramine The solution concentration of amine, 1,4-cyclohexanedicarboxylic acid and isophthalic acid is 20wt%, ...

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Abstract

The invention discloses ammonium polybenzimidazole, an alkaline ion exchange membrane of the ammonium polybenzimidazole, and a preparation method and application of an ionomer of the ammonium polybenzimidazole. Aromatic tetramine monomers and dicarboxylic acid monomers are subjected to condensation polymerization at high temperature to obtain high-molecular-weight polybenzimidazole. Then, through grafting reaction, polybenzimidazole with long-chain ammonium salt is synthesized, and the polybenzimidazole can be dissolved in low-boiling-point solvents such as methanol to obtain a clear ionomer solution; and preparing a membrane casting solution from the polybenzimidazole with the long-chain ammonium salt to obtain the alkaline anion exchange membrane. The ammonium polybenzimidazole ionomer solution prepared by the method has the characteristics that a low-boiling-point solvent is easy to volatilize, the film-forming property is good, the dispersity is good and the binding power is strong; the ionomer solution and the alkaline ion exchange membrane have high ionic conductivity, high alkali-resistant stability and oxidation resistance and excellent mechanical properties, and are widely applied to the fields of fuel cells, water electrolysis hydrogen production, energy storage cells, carbon dioxide conversion, chlor-alkali industry and other electrochemical devices.

Description

technical field [0001] The invention belongs to the technical field of polymer electrolytes and ion-exchange membranes, and relates to a preparation method and application of an ammonized polybenzimidazole, an alkaline ion-exchange membrane, and an ionomer, in particular to an ionomer soluble in a low-boiling point solvent. The preparation method and application of the long-chain ammonium salt polybenzimidazole electrolyte, its basic ion exchange membrane and ionomer. Background technique [0002] Due to the global energy crisis, the development of efficient and clean hydrogen energy technology is imminent. Fuel cells, hydrogen production by electrolysis of water and other related electrochemical devices are low-cost green and clean energy sources with broad application prospects. In electrochemical devices such as fuel cells, water electrolysis hydrogen production, and carbon dioxide conversion, ionomer solutions (Ionomer) and alkaline ion exchange membranes have an import...

Claims

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Application Information

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IPC IPC(8): C08G73/18C08J5/22C08L79/04H01M8/103H01M8/1072
CPCC08G73/18C08J5/2256C08J5/2287H01M8/103H01M8/1072C08J2379/04Y02E60/50
Inventor 朱秀玲郭茂莲
Owner DALIAN UNIV OF TECH
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