Double-quaternary ammonium positive ion molecule introduced anion-exchange membrane and preparation method thereof

A double quaternary ammonium cation and anion exchange membrane technology, which is applied to the components of fuel cells, etc., can solve the problem of no long alkyl chain design, etc., to improve mechanical properties, increase ion exchange capacity and water content, and improve conduction efficiency Effect

Inactive Publication Date: 2015-03-04
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the literatures that have been reported so far mainly focus on the "simple" introduction of long alkyl chains to assist in enhancing the self-aggregation of cation active sites, without properly designing the strength and grafting position of long alkyl chains to help amplify cations more effectively. The self-aggregation phenomenon of active sites builds continuous microphase partitions to further improve ion conduction efficiency

Method used

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  • Double-quaternary ammonium positive ion molecule introduced anion-exchange membrane and preparation method thereof
  • Double-quaternary ammonium positive ion molecule introduced anion-exchange membrane and preparation method thereof
  • Double-quaternary ammonium positive ion molecule introduced anion-exchange membrane and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of the anion exchange membrane that introduces diquaternary ammonium cation molecules is as figure 1 shown, follow the steps below:

[0034] (1) Preparation of quaternary ammonium polymers:

[0035] Add isopropanol to chitosan with a degree of deacetylation ≥ 95% to form a chitosan isopropanol solution with a mass concentration of 20%, heat it in a water bath to 80°C under mechanical stirring, and then add an equal volume of 2, 3-Epoxypropyltrimethylammonium chloride aqueous solution, stirred at constant temperature for 8 hours, then distilled under reduced pressure, dried the obtained product at 70°C for 50 minutes, and pulverized into powder to obtain a quaternized ammonium substitution degree of 65%. quaternized chitosan;

[0036] (2) Introduce diquaternary ammonium cation molecules and form membranes:

[0037] Dissolve the quaternized chitosan obtained in step (1) in an acetic acid solution to prepare a quaternized chitosan acetate casting ...

Embodiment 2

[0046] The preparation method of the anion exchange membrane that introduces diquaternary ammonium cation molecules is as figure 1 shown, follow the steps below:

[0047] (1) Preparation of quaternary ammonium polymers:

[0048] Add isopropanol to chitosan with a degree of deacetylation ≥ 95% to form a chitosan isopropanol solution with a mass concentration of 20%, heat it in a water bath to 85°C under mechanical stirring, and then add an equal volume of 2, 3-Epoxypropyltrimethylammonium chloride aqueous solution, stirred at constant temperature for 10 hours, then distilled under reduced pressure, dried the obtained product at 90°C for 30 minutes, and pulverized into powder to obtain a quaternized ammonium substitution degree of 65%. Quaternized chitosan;

[0049] (2) Introduce diquaternary ammonium cation molecules and form membranes:

[0050] Dissolve the quaternized chitosan obtained in step (1) in an acetic acid solution to prepare a quaternized chitosan acetate casting...

Embodiment 3

[0061] The preparation method of the anion exchange membrane that introduces diquaternary ammonium cation molecules is as figure 1 shown, follow the steps below:

[0062] (1) Preparation of quaternary ammonium polymers:

[0063] Add isopropanol to chitosan with a deacetylation degree ≥ 95% to form a chitosan isopropanol solution with a mass concentration of 20%, heat it in a water bath to 90°C under mechanical stirring, and then add an equal volume of 2, 3-Epoxypropyltrimethylammonium chloride aqueous solution, stirred at constant temperature for 12 hours, then distilled under reduced pressure, dried the obtained product at 80°C for 40 minutes, and pulverized into powder to obtain a quaternized ammonium substitution degree of 65%. quaternized chitosan;

[0064] (2) Introduce diquaternary ammonium cation molecules and form membranes:

[0065] Dissolve the quaternized chitosan obtained in step (1) in an acetic acid solution to prepare a quaternized chitosan acetate casting so...

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Abstract

The invention belongs to the technical field of fuel cells, and particularly relates to a double-quaternary ammonium positive ion molecule introduced anion-exchange membrane and a preparation method thereof. The double-quaternary ammonium positive ion molecular introduced anion-exchange membrane is a membrane having a full-interpenetrating network structure, which is formed by the crosslinking between amino groups in quaternized chitosan and amino groups in a double-quaternary ammonium positive ion molecule / acrylamide block polymer, the mutual crosslinking of the amino groups in the quaternized chitosan and the crosslinking of the amino groups in the double-quaternary ammonium positive ion molecule / acrylamide block polymer. The preparation method comprises the following steps: preparing the quaternized chitosan, then introducing double-quaternary ammonium positive ion molecules and preparing the membrane. The double-quaternary ammonium positive ion molecule introduced anion-exchange membrane has the advantages that a reverse U-shaped channel formed in an anionic membrane structure is used for constructing an ordered and continuous microphase zonal structure for OH<-> migration and facilitates the improvement of the conduction efficiency of OH<-> in the solution, the conductivity of the OH<-> is improved while the ion exchange capacity and the moisture content are not increased, and the mechanical property is improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to an anion exchange membrane introduced with diquaternary ammonium cation molecules and a preparation method thereof. Background technique [0002] Since the working environment of the anion exchange membrane fuel cell is alkaline, it is obviously easier to perform oxygen reduction and fuel oxidation than the proton exchange membrane fuel cell. Therefore, the efficiency of the fuel cell of the anion exchange membrane is higher, and at the same time, a non-precious metal catalyst can be used to reduce the cost of use. The above-mentioned advantages of anion exchange membranes have led domestic and foreign scholars to carry out a lot of research in the field of anion exchange membranes for fuel cells, hoping to speed up their commercialization. However, it is regrettable that none of the anion exchange membranes reported for fuel cells can achieve the performance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08J5/22C08L5/08C08L33/26C08F220/56C08F220/34C08B37/08H01M8/02
CPCY02E60/50
Inventor 王吉林王璐璐
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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