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Anionic membrane introducing n-alkyl dinuclear imidazolium cation and preparation method thereof

A dual-nuclear alkyl imidazolium cation and anion membrane technology, applied in fuel cells, electrical components, electrochemical generators, etc., to achieve the effects of improving compatibility, improving mechanical properties, and increasing ion exchange capacity

Active Publication Date: 2016-08-24
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

[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 introducing n-alkyl dinuclear imidazolium cation and preparation method thereof
  • Anionic membrane introducing n-alkyl dinuclear imidazolium cation and preparation method thereof
  • Anionic membrane introducing n-alkyl dinuclear imidazolium cation and preparation method thereof

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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 in particular relates to an anion membrane introduced with dinuclear alkylimidazolium cations and a preparation method thereof. The present invention expands the polymer skeleton through a suitable solvent, then fills the small molecule raw materials used to prepare N-dodecyl dinuclear imidazolium cation molecules into the vicinity of the polymer skeleton, and prepares the raw materials into N-dodecyl dinuclear imidazolium cation molecules through chemical reactions Dodecyl dinuclear imidazolium cation molecule. The polymer is cross-linked so that the N-dodecyl dinuclear imidazolium cation molecules are wrapped in the polymer, and finally the anions are exchanged for OH-in a certain concentration of lye, thereby obtaining an alkaline anion membrane suitable for fuel cells. The invention combines the traditional quaternary ammonium group grafting method with the introduction of ready-made N+ ion groups, which can compensate for the deterioration of polymer properties and the decrease in crystallinity caused by excessive quaternary ammonium group grafting.

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 Patents(China)
IPC IPC(8): C08J5/22C08J7/12C08L5/08C08K5/3445C08J3/24H01M2/16C02F1/28H01M8/0239H01M8/103H01M8/1081
CPCY02E60/50
Inventor 王吉林王璐璐
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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