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Preparation method for double quaternary ammonium side long chain anion-exchange membrane

A technology of anion exchange membrane and diquaternary ammonium, which is applied in anion exchange, ion exchange, chemical instruments and methods, etc., can solve the problem of limiting anion exchange membrane anion conductivity, poor microscopic hydrophilic and hydrophobic phase separation ability, and unsuitable for large-scale In order to achieve the effect of improving ion conductivity, cheap raw materials, and promoting the separation of microscopic hydrophilic and hydrophobic phases

Active Publication Date: 2015-01-28
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the raw material 2,3-epoxypropyltrimethylammonium chloride used in this preparation process is relatively expensive and is not suitable for large-scale industrial applications.
And because the two quaternary ammonium groups in the side chain share a β-hydrogen, the side chain is more prone to Hofmann degradation reaction
In addition, there is only three carbon atoms between the quaternary ammonium group at the end of the side chain and the main chain, resulting in poor mobility of the side chain, which makes the microscopic hydrophilic-hydrophobic phase separation ability of this anion-exchange membrane poor, thus limiting The anion conductivity of this kind of anion exchange membrane, on the other hand, also leads to the poor flexibility of its anion exchange membrane

Method used

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  • Preparation method for double quaternary ammonium side long chain anion-exchange membrane
  • Preparation method for double quaternary ammonium side long chain anion-exchange membrane
  • Preparation method for double quaternary ammonium side long chain anion-exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation of 6-(dimethylamino)hexyl-N,N-dimethyl-N-ethylammonium bromide: 1 mL of N,N,N',N'-tetramethyl-1,6-hexyl The diamine was dissolved in 19 mL of ethanol to form a 5% solution by volume, and 1-fold molar amount of 1-bromoethane was added to react at room temperature for 48 h. Rotary evaporation to remove ethanol, add an appropriate amount of acetone, filter to remove the precipitate, the filtrate is processed by rotary evaporation, remove the acetone, wash with ether several times, and filter to obtain 6-(dimethylamino)hexyl-N,N-dimethyl- N-Ethylammonium bromide.

[0044] Preparation of double quaternary ammonium side long-chain anion exchange membrane: 0.3g of brominated polyphenylene ether with a bromination degree of 0.084 was dissolved in 3mL (2.92g) of N-methyl-2-pyrrolidone, and then 0.084g of 6- (Dimethylamino)hexyl-N,N-dimethyl-N-ethylammonium bromide, stirred at room temperature for 12 hours to obtain a uniform casting solution. The above-mentioned ca...

Embodiment 2

[0049] The preparation of 6-(dimethylamino)hexyl-N,N-dimethyl-N-ethylammonium bromide: same as Example 1

[0050] Preparation of double quaternary ammonium side long-chain anion exchange membrane: 0.3g of brominated polyphenylene ether with a bromination degree of 0.093 was dissolved in 3mL (2.92g) of N-methyl-2-pyrrolidone, and then 0.092g of 6- (Dimethylamino)hexyl-N,N-dimethyl-N-ethylammonium bromide, stirred at room temperature for 12 hours to obtain a uniform casting solution, and evenly coated the above casting solution on a glass plate, at 60°C After drying for 12 hours, soaking in deionized water for 12 hours, the double-quaternary ammonium-side long-chain anion exchange membrane is obtained.

[0051] Water content and ion exchange capacity tests show that the water content of the anion exchange membrane prepared in this example is 18.2%, and the anion exchange capacity is 1.24mmol.g -1 ; OH of the film - The conductance is 21.6mS.cm -1 , the tensile strength is 33....

Embodiment 3

[0053] The preparation of 6-(dimethylamino)hexyl-N,N-dimethyl-N-ethylammonium bromide: same as Example 1

[0054] Preparation of double quaternary ammonium side long-chain anion exchange membrane: 0.3g of brominated polyphenylene ether with a bromination degree of 0.13 was dissolved in 3mL (2.92g) of N-methyl-2-pyrrolidone, and then 0.126g of 6-( Dimethylamino)hexyl-N,N-dimethyl-N-ethylammonium bromide, stirred at room temperature for 12 hours to obtain a uniform casting solution, uniformly coated the above casting solution on a glass plate, and baked at 60°C Dry for 12 hours, and then soak in deionized water for 12 hours to obtain a double-quaternary ammonium side long-chain anion exchange membrane.

[0055] The water content and ion exchange capacity tests show that the water content of the anion exchange membrane prepared in this example is 42.5%, and the anion exchange capacity is 1.60mmol.g -1 ; OH of the film - The conductance is 36.3mS.cm -1 , the tensile strength is...

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Abstract

The invention discloses a preparation method for a double quaternary ammonium side long chain anion-exchange membrane. The preparation method is characterized in that a dual-functional monomer with both tertiary amine group and quaternary ammonium group performs nucleophilic substitution on the main polymer chain with live benzyl bromine, benzyl chloride or chlorine acyl group, so as to obtain the double quaternary ammonium side long chain anion-exchange membrane. The raw materials are cheap and are easy to obtain, the preparation method is simple and is applicable to large scale industrial production, and the prepared anion-exchange membrane has the advantages of high ion conductivity, long service life, excellent mechanical property, and good solubility.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a high-anion-conductivity double-quaternary ammonium side long-chain anion exchange membrane and a preparation method thereof. Background technique [0002] Anion exchange membranes are widely used in metallurgy, chemical industry, biology and energy. Improvements are getting more and more attention. [0003] British "Energy and Environmental Science" (Energy Environ.Sci., 2013,6,2912) reported a preparation method of a double quaternary ammonium side long-chain type anion exchange membrane, that is, 2,3-epoxypropyl trimethyl Ammonium chloride (GTMC) reacts with dimethylamine to produce 3-(dimethylamino)-2-hydroxypropyl-N,N,N-trimethylammonium chloride (DHTC). This functional group has a tertiary amine group on one end and a quaternary ammonium group on the other. Using this functional group to carry out nucleophilic substitution reaction on chloromethylated poly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08L71/12C08L81/06C08L71/10C08L25/06C08G65/48C08G75/20C08G75/23C08F12/08C08F8/44B01J41/12B01J41/13
Inventor 徐铜文贺玉彬
Owner UNIV OF SCI & TECH OF CHINA
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