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Preparation method of anion-exchange membranes based on ionic liquid

A technology of anion exchange membrane and ionic liquid, applied in the field of ion exchange membrane, can solve the problems of low conductivity, etc., and achieve the effects of good stability, simple process, good thermal stability and mechanical properties

Inactive Publication Date: 2010-09-29
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method has a low electrical conductivity due to the selection of its matrix material. In addition, due to the introduction of the initiator in the heat treatment process, it cannot be removed in subsequent operations, so the ion exchange membrane is heterogeneous.

Method used

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  • Preparation method of anion-exchange membranes based on ionic liquid
  • Preparation method of anion-exchange membranes based on ionic liquid
  • Preparation method of anion-exchange membranes based on ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 0.01mol of 1-allyl-3-methyl imidazole chloride, 0.0167mol of methyl methacrylate, 5mL of N,N-dimethylformamide and 0.25g of azobisisobutyronitrile into a three-necked flask , under the protection of nitrogen, placed in a water bath temperature of 45 ° C, stirred and refluxed for 30 h. The obtained copolymer was precipitated and washed with methanol several times, and dried for future use. Fully dissolve 1 g of the obtained copolymer in 20 mL of N,N-dimethylformamide, and let stand to defoam. After defoaming, the polymer solution was dried in a vacuum oven at 60°C for 24 hours to remove the solvent to form a chloride-type anion exchange membrane.

[0028] The resulting chloride-type anion exchange membrane was placed in 1mol L -1 Soak in NaOH solution for 24h, wait for Cl - completely converted to OH - Finally, remove the residual NaOH solution with deionized water and soak for 72 hours to obtain a hydroxide-type anion exchange membrane.

[0029] FT-IR 740SX sp...

Embodiment 2

[0041] Add 0.01 mol of 1-allyl-3-methyl imidazole bromide, 0.0125 mol of methyl methacrylate, 6 mL of chloroform and 0.20 g of azobisisobutyronitrile into a three-necked flask, under the protection of argon , placed in a water bath temperature of 50°C, stirred and refluxed for 25h. The obtained copolymer was precipitated and washed with ethanol several times, and dried for future use. Fully dissolve 1 g of the obtained copolymer in 15 mL of N,N-dimethylacetamide, and let it stand for defoaming. After defoaming, the polymer solution was dried in a vacuum oven at 70°C for 20 hours to remove the solvent to form a bromine-type anion exchange membrane.

[0042] The resulting bromine-type anion-exchange membrane was placed in 2mol L -1 Soaked in KOH solution for 24h, when the Br - completely converted to OH - Finally, remove the residual KOH solution with deionized water and soak for 72 hours to obtain a hydroxide-type anion exchange membrane.

[0043] The IEC of this film at r...

Embodiment 3

[0045] Add 0.01mol of 1-allyl-3-methyl imidazole chloride, 0.0250mol of butyl methacrylate, 7mL of toluene and 0.30g of benzoyl peroxide in a three-necked flask, under the protection of argon, Placed in a water bath temperature of 55°C, stirred and refluxed for 20h. The obtained copolymer was precipitated and washed with ethanol several times, and dried for future use. Fully dissolve 1 g of the obtained copolymer in 30 mL of tetrahydrofuran, and let it stand for defoaming. After defoaming, the polymer solution was dried in a vacuum oven at 60°C for 24 hours to remove the solvent to form a chloride-type anion exchange membrane.

[0046] Place the resulting chloride-type anion exchange membrane in a 3mol L -1 Soak in NaOH solution for 24h, wait for Cl - completely converted to OH - Finally, remove the residual NaOH solution with deionized water and soak for 72 hours to obtain a hydroxide-type anion exchange membrane.

[0047] The IEC of this film at room temperature is 0.19...

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Abstract

The invention provides a preparation method of anion-exchange membranes based on ionic liquid, which relates to an ion exchange membrane. The invention provides an anion-exchange membrane based on ionic liquid with the advantages of environment-friendly effect, high electric conductivity, good chemical stability, good thermostability and good mechanical performance and a preparation method thereof. The free radical copolymerization reaction is carried out for preparing imidazolium type polymers according to the following steps: adding imidazole type ionic liquid monomers, acrylic ester monomers, solvents and triggering agents into a reaction vessel for carrying out back flowing reaction under the protection of inert gas; carrying out precipitation, washing and drying on obtained products to obtain the imidazolium type polymers. The membrane forming is carried out according to the following steps: dissolving the imidazolium type polymers obtained in the first step into organic solvents to be prepared into polymer solution, forming the membranes through a phase conversation method, and obtaining the anion-exchange membranes based on the ionic liquid.

Description

technical field [0001] The invention relates to an ion exchange membrane, in particular to an anion exchange membrane based on imidazole type ionic liquid and a preparation method thereof. Background technique [0002] Anion exchange membranes are key materials in separation, purification, and electrochemical components, and have been widely used in various industrial fields, such as water treatment, purification, concentration, and separation of substances, chlor-alkali industry, heavy metal recovery, and alkaline anion exchange membrane fuel cells , liquid flow energy storage batteries, new supercapacitors, etc. [0003] The most common preparation method of organic anion exchange membranes is to start from commercially available polymers and perform functional modification, such as chloromethylation, followed by quaternization. Chinese patent 200710072040.7 discloses a modified anion exchange membrane and its preparation method, which is to dissolve polyvinylidene fluori...

Claims

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Application Information

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IPC IPC(8): B01D71/62B01D67/00B01D69/02C08F220/14C08F226/06C08F220/18
CPCY02P20/54
Inventor 方军郭明俐李伟徐汉坤
Owner XIAMEN UNIV
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