Anionic membrane introduced into N-alkyl dual-core imidazolium cations and preparation method thereof

A dual-nuclear alkyl imidazolium cation and anion membrane technology, which is applied to fuel cell parts, fuel cells, electrical components, etc., to achieve the effects of improving mechanical properties, centralizing the distribution of cationic active sites, and increasing ion exchange capacity

Active Publication Date: 2014-05-07
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The traditional method of grafting quaternary ammonium groups combined with the introduction of ready-made N+ ion groups to prepare anion membranes has not been reported in the prior art

Method used

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  • Anionic membrane introduced into N-alkyl dual-core imidazolium cations and preparation method thereof
  • Anionic membrane introduced into N-alkyl dual-core imidazolium cations and preparation method thereof
  • Anionic membrane introduced into N-alkyl dual-core imidazolium cations and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method of the anion-exchange membrane that introduces dinuclear dodecyl imidazolium cation molecules is as follows figure 1 shown, follow the steps below:

[0042] (1) Preparation of quaternary ammonium polymers:

[0043] 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 6 hours, then distilled under reduced pressure, vacuum-dried the obtained product at 60°C to constant weight, and pulverized into powder to obtain a quaternized ammonium substitution degree of 40 % of quaternized chitosan.

[0044] (2) Introduce binuclear dodecyl imidazolium cations and form membranes:

[0045] Dissolve N-dodecylimidazole (4.72 g, 20 mmol) and 1,4-dibromobutane (2.16 g, 10 mmol) in 25 mL of isoprop...

Embodiment 2

[0047] The preparation method of the anion-exchange membrane that introduces dinuclear dodecyl imidazolium cation molecules is as follows figure 1 shown, follow the steps below:

[0048] (1) Preparation of quaternary ammonium polymers:

[0049] 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 6 hours, then distilled under reduced pressure, vacuum-dried the obtained product at 60°C to constant weight, and pulverized into powder to obtain a quaternized ammonium substitution degree of 40 % of quaternized chitosan.

[0050] (2) Introduce binuclear dodecyl imidazolium cations and form membranes:

[0051] Dissolve N-dodecylimidazole (4.72 g, 20 mmol) and 1,4-dibromobutane (2.16 g, 10 mmol) in 25 mL of isopr...

Embodiment 3

[0053] The preparation method of the anion-exchange membrane that introduces dinuclear dodecyl imidazolium cation molecules is as follows figure 1 shown, follow the steps below:

[0054] (1) Preparation of quaternary ammonium polymers:

[0055] 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 6 hours, then distilled under reduced pressure, vacuum-dried the obtained product at 60°C to constant weight, and pulverized into powder to obtain a quaternized ammonium substitution degree of 40 % of quaternized chitosan.

[0056] (2) Introduce binuclear dodecyl imidazolium cations and form membranes:

[0057] Dissolve N-dodecylimidazole (4.72 g, 20 mmol) and 1,4-dibromobutane (2.16 g, 10 mmol) in 25 mL of isopr...

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Abstract

The invention belongs to the technical field of fuel cells, and particularly relates to an anionic membrane introduced into N-alkyl dual-core imidazolium cations and a preparation method thereof. The preparation method comprises the following steps: expanding a polymer framework by using a proper solvent, then filling a micromolecular raw material used for preparing N-dodecyl dual-core imidazolium cation molecules near the polymer framework, preparing the raw material into the N-dodecyl dual-core imidazolium cation molecules by virtue of generation of a chemical reaction; crosslinking the polymer to ensure that the N-dodecyl dual-core imidazolium cation molecules are wrapped by the polymer; finally, exchanging anions into OH<-> in an alkali liquor with a certain concentration so as to prepare the alkali anionic membrane suitable for being used by the fuel cell. A conventional grafting method of a quaternary ammonium group is combined with introduction of existing N<+> ion groups, so that the problems of poor qualitative change of property of the polymer and crystallinity degree reduction caused by excessive grafting of the quaternary ammonium group can be solved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to an anion membrane introduced with dinuclear alkylimidazolium cations and a preparation method thereof. Background technique: [0002] As the core component of alkaline membrane fuel cells, one of the most interesting properties of anion exchange membranes is electrical conductivity. Compared with proton exchange membranes, anion exchange membranes have inherent disadvantages in electrical conductivity. Anion membrane (OH - ) are weaker than the proton membrane (H + ). In order to endow the membrane electrolyte with a certain OH - Conductivity, domestic and foreign researchers mainly focus on the following aspects to carry out research work: [0003] (1) Use more alkaline substances to make membranes. For example, quaternary phosphonium salts with stronger basicity than quaternary ammonium substances are prepared by means of chloromethylation-quaternary phosph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08J7/12C08L5/08C08K5/3445C08J3/24H01M8/02H01M2/16C02F1/28H01M8/103H01M8/1081
CPCY02E60/50
Inventor 王吉林王璐璐
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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