Fluorine-containing acrylate polymer anion exchange membrane and preparation method thereof

An anion exchange membrane and acrylate technology, applied in the field of ion exchange membrane, can solve the problems of thermal stability, poor chemical stability, easy degradation, etc., and achieve the effect of inhibiting methanol permeation, good mechanical properties and chemical stability

Inactive Publication Date: 2011-07-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional anion-exchange membrane preparation process, the chloromethylation reaction requires the use of the highly toxic carcinogen chloromethyl ether; and the thermal and chemical stability of the polymer anion-exchange membrane obtained by the traditional preparation process is relatively poor. Easy to degrade in high temperature or strong oxidizing agent

Method used

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  • Fluorine-containing acrylate polymer anion exchange membrane and preparation method thereof
  • Fluorine-containing acrylate polymer anion exchange membrane and preparation method thereof
  • Fluorine-containing acrylate polymer anion exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Fluorinated Acrylate Polymer Anion Exchange Membrane

[0033] Add 0.01mol of dimethylaminoethyl methacrylate, 0.01mol of trifluoroethyl methacrylate, 10ml of tetrahydrofuran and 0.043g of azobisisobutyronitrile into a three-necked flask, and place at 65 ℃ water bath temperature, stirred and refluxed for 12h. The product was precipitated with ice water, washed with methanol to remove unreacted monomers, and dried at 65°C to obtain a polymer with tertiary amine groups.

[0034] 1 g of the above polymer was fully dissolved in 20 ml of N, N-dimethylformamide, vacuum degassed, cast on a clean glass plate to form a film, and dried at 60°C for 24 hours. The cast membrane was then placed in a 1mol L -1 In aqueous hydrochloric acid solution, after reacting at 30°C for 24 hours, rinse with a large amount of water until there is no hydrochloric acid, and place in 2mol·L -1 Transformation in NaOH solution to obtain hydrogen-oxygen type fluorine-containing acrylate polymer anion ...

Embodiment 2

[0041] The same method as in Example 1 was used, except that the amount of dimethylaminoethyl methacrylate was 0.02 mol, and the amount of trifluoroethyl methacrylate was 0.01 mol.

[0042] It was determined that the water content of the membrane was 19%, and the ion exchange capacity was 2.916mmol·g -1 . The methanol permeability coefficient of the membrane is less than 10 at room temperature -8 cm 2 ·s -1 ,Such as Figure 5 As shown in the middle curve C, the methanol permeability coefficient of the membrane increases with the increase of temperature. The conductivity of the film at room temperature is 0.05 S cm -1 , the conductivity varies with temperature as Figure 6 As shown in the middle curve C, the conductivity of the film increases with the increase of temperature, and it can still maintain a high conductivity at a high temperature of 95 °C.

Embodiment 3

[0044] The same method as in Example was used, except that the amount of dimethylaminoethyl methacrylate was 0.05 mol, and the amount of trifluoroethyl methacrylate was 0.1 mol.

[0045] It was determined that the water content of the membrane was 33.2%, and the ion exchange capacity was 1.197mmol·g -1 . The methanol permeability coefficient of the membrane is less than 10 at room temperature -8 cm 2 ·s -1 ,Such as Figure 5 As shown in the middle curve A, the methanol permeability coefficient of the membrane increases with the increase of temperature. The conductivity of the film at room temperature is 0.01 S cm -1 , the conductivity varies with temperature as Figure 6 As shown in the middle curve A, the conductivity of the membrane increases with the increase of temperature, and it can still maintain a high conductivity at a high temperature of 95 °C.

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Abstract

The invention discloses relates to an ion exchange membrane and provides a fluorine-containing acrylate polymer anion exchange membrane with high conductivity, good barrier effect on methanol, good chemical stability and high heat stability and a preparation method thereof, wherein the active group of the prepared exchange membrane is quaternary ammonium salt and the prepared exchange membrane can serve as the anion exchange membrane of an alkaline direct methanol fuel cell. The active group of the fluorine-containing acrylate polymer anion exchange membrane is the quaternary ammonium salt and the preparation method of the fluorine-containing acrylate polymer anion exchange membrane comprises the steps of: subjecting the fluorine-containing acrylate and the acrylate containing a tertiary amine functional group to free radical polymerization to obtain polymer containing the tertiary amine functional group; precipitating, washing, and drying the obtained polymer; dissolving into an organic solvent; forming a membrane through a phase transformation method, and finally soaking the membrane into a quaternary ammonium reagent to react for some time; taking the membrane out; and washing and drying to obtain the fluorine-containing acrylate polymer anion exchange membrane.

Description

technical field [0001] The invention relates to an ion exchange membrane, in particular to a fluorine-containing acrylate polymer anion exchange membrane 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. The ion exchange membrane is actually a membrane-like ion exchange resin, which is also a polymer electrolyte containing active exchange groups. The membrane-like polymer skeleton is usually called the basement membrane, and the ion-exchange membrane is obtained by introducing the basement membrane into a group with an ion-exchange function through a chemical react...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M2/16C08F220/34C08F220/22C08J7/12C08J5/22H01M8/1039H01M8/1069
CPCY02E60/12Y02E60/50
Inventor 方军张燕梅伍永彬
Owner XIAMEN UNIV
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