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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: 2014-02-05
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Effect test

Embodiment 1

[0033] The preparation method of anion exchange membrane with double quaternary ammonium cation molecules is as follows figure 1 As 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 to 80℃ in a water bath under mechanical stirring, and then add an equal volume of 2, The 3-epoxypropyltrimethylammonium chloride aqueous solution was stirred at a constant temperature for 8 hours and then distilled under reduced pressure. The product obtained was dried at 70°C for 50 minutes and pulverized into powder to obtain a quaternized substitution degree of 65%. The quaternized chitosan;

[0036] (2) Introducing double quaternary ammonium cation molecules and forming membranes:

[0037] The quaternized chitosan obtained in step (1) is dissolved in an acetic acid solution to prepare a quaternized chitosan acetic...

Embodiment 2

[0046] The preparation method of anion exchange membrane with double quaternary ammonium cation molecules is as follows figure 1 As 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 to 85℃ in a water bath under mechanical stirring, and then add an equal volume of 2, Aqueous 3-epoxypropyltrimethylammonium chloride solution was stirred at a constant temperature for 10 hours and then distilled under reduced pressure. The product obtained was dried at 90°C for 30 minutes and pulverized into powder to obtain a quaternized substitution degree of 65% Quaternized chitosan;

[0049] (2) Introducing double quaternary ammonium cation molecules and forming membranes:

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

Embodiment 3

[0061] The preparation method of anion exchange membrane with double quaternary ammonium cation molecule is as figure 1 As shown, follow the steps below:

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

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

[0064] (2) Introducing double quaternary ammonium cation molecules and forming membranes:

[0065] Dissolve the quaternized chitosan obtained in step (1) in the acetic acid solution to prepare a quaternized chitosan acetic acid 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 specifically 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 anion exchange membrane fuel cells is alkaline, it is significantly easier to perform oxygen reduction and fuel oxidation than proton exchange membrane fuel cells. Therefore, the efficiency of the anion exchange membrane fuel cell is higher, and at the same time, non-noble metal catalysts can be used to reduce the use cost. 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 accelerate their commercialization. However, it is regrettable that none of the reported anion exchange membranes for fuel cells in terms of conductivity and stability can achie...

Claims

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Application Information

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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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