Polymer containing quaternary ammonium group, anion exchange membrane and preparation method thereof

A quaternary ammonium group, polymer technology, applied in the field of quaternary ammonium group-containing polymers, anion exchange membranes and their preparation, can solve the problems of hindering ion conduction, reducing membrane toughness and mechanical processing performance, and having no ion conductivity.

Active Publication Date: 2016-04-20
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the doping of inorganic nanomaterials, the ionic conductivity of AEMs materials usually decreases, because most dopants have poor ion conductivity or no ion conductivity at all, and such dopants are in the polymer electrolyte. The membrane hinders the conduction of ions to a certain extent
In addition, these dopants often lead to changes in the microstructure of the film (holes, interface separation), resulting in a decrease in film toughness and mechanical processing performance, and weaken the contact ability between the film and the catalyst layer, which cannot meet the long-term requirements of electrochemical devices. need for stability

Method used

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  • Polymer containing quaternary ammonium group, anion exchange membrane and preparation method thereof
  • Polymer containing quaternary ammonium group, anion exchange membrane and preparation method thereof
  • Polymer containing quaternary ammonium group, anion exchange membrane and preparation method thereof

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preparation example Construction

[0041] The present invention also provides a kind of preparation method of anion exchange membrane, comprises the following steps,

[0042] A) under a protective atmosphere, after mixing and reacting a polymer containing a tertiary amine group in the side chain, a quaternizing agent and an anhydrous polar aprotic solvent, a polymer solution containing a quaternary ammonium group is obtained;

[0043] The polymer containing tertiary amine groups in the side chain is polyarylether sulfone containing tertiary amine groups in the side chain, polyarylether ketone containing tertiary amine groups in the side chain and polyarylether sulfone ketone containing tertiary amine groups in the side chain One or more of them; the quaternizing agent is one or more of methyl iodide, (3-chloropropyl) trimethoxysilane and (3-chloropropyl) trimethoxysilane systems;

[0044] B) After adding an alcohol solvent to the polymer solution containing quaternary ammonium groups obtained in the above steps...

Embodiment 1

[0104] Polymer 1P 1 The preparation process

[0105] Under nitrogen protection, 7.00 grams (12.0 mmol) of tertiary amine polymer 1P 0It was dissolved in 115 mL of dry N,N-dimethylacetamide, and after stirring and dissolving completely, 1.71 g (12.0 mmol) of iodomethane was added thereto. After reacting at room temperature for 24 hours, the above-mentioned reaction solution was cast into a film in a 60°C oven. After volatilizing most of the solvent, it was heated (120°C) and vacuum-dried to remove the remaining solvent in the film, and cooled to At room temperature, a polymer film is finally obtained. The membranes were soaked in 1M sodium hydroxide solution for 48 hours for ion exchange, then soaked in deionized water for 48 hours, and washed with the solution for more than three times. Finally, the membrane was stored in deionized water until use.

Embodiment 2

[0107] 1P 2 The preparation process

[0108] Under nitrogen protection, 7.00 grams (12.0 mmol) of tertiary amine polymer P 0 Dissolve in 115mL of dry N,N-dimethylacetamide, after stirring and dissolving completely, add 2.37g (12.0mmol) of (3-chloropropyl)trimethoxysilane (CPTMS) and catalyst amount Anhydrous potassium iodide [the dosage is 0.5% (molar equivalent) of CPTMS]. The temperature was controlled at 85°C, and after 24 hours of reaction, 5 mL of 95% EtOH was added to continue the reaction (hydrolysis) for 30 minutes. The above reaction solution was cast into a film in a 60°C oven, and after most of the solvent was evaporated, it was heated (120°C) and vacuum-dried to remove the residual solvent in the film, cooled to room temperature, and finally obtained a polymer object film. The membranes were soaked in 1M sodium hydroxide solution for 48 hours for ion exchange, then soaked in deionized water for 48 hours, and washed with the solution for more than three times. ...

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Abstract

The invention provides a polymer containing a quaternary ammonium group. The polymer is obtained through a reaction of a quaternization reagent and a polymer with a side chain containing a tertiary amine group. The polymer with the side chain containing the tertiary amine group is one or more of polyether sulphone with a side chain containing a tertiary amine group and polyaryletherketone with a side chain containing a tertiary amine group and PPESK with a side chain containing a tertiary amine group. The quaternization reagent is one or more of iodomethane, (3-chloropropyl) trimethoxy silane and a (3-chloropropyl) trimethoxy silane system. According to the polymer, the polyether sulphone with the side chain containing the tertiary amine group and the polyaryletherketone with the side chain containing the tertiary amine group and the PPESK with the side chain containing the tertiary amine group are adopted as raw materials, grafting is performed on the appropriate condition to generate the quaternary ammonium group, a siloxane group and the quaternary ammonium group exist in a novel anion exchange membrane material structure in a covalent bond binding mode, the alkali stability and the size stability of the membrane material are improved, and meanwhile the tenacity and mechanical performance of the membrane material can be improved.

Description

technical field [0001] The invention relates to the technical field of charged membranes, in particular to a polymer containing quaternary ammonium groups, an anion exchange membrane and a preparation method thereof. Background technique [0002] Anion Exchange Membrane (AEM for short) is a polymer electrolyte membrane that selectively permeates anions (usually only allows hydroxide ions to pass through). It contains basic active groups and has selective permeability for anions. The anion exchange membrane is composed of three parts: the polymer main chain with a fixed group, that is, the polymer matrix (also known as the base membrane), the positively charged active group (ie, the cation), and the anion that can move freely on the active group. . Two important indicators for evaluating the performance of anion exchange membranes are ionic conductivity and alkali stability (or chemical stability). Ionic conductivity is usually measured by ionic conductivity, and the higher ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G75/23C08G65/48C08J5/18H01M4/88
CPCC08G65/48C08G75/23C08J5/18C08J2371/10C08J2381/06H01M4/88Y02E60/50
Inventor 郑吉富张所波李胜海
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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