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Method for preparing brominated-polyphenylene-ether-guanidination-based homogeneous anion exchange membrane

A technology of anion exchange membrane and brominated polyphenylene ether, applied in the direction of anion exchange, ion exchange, chemical instruments and methods, etc., can solve the problems of low membrane conductance, restriction, poor stability, etc., and achieve high ion exchange content, good Effect of thermal stability and mechanical strength, good application prospects

Inactive Publication Date: 2012-10-03
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the poor basicity of trimethylamine, there is a disadvantage that the conductivity of the membrane is not high. At the same time, the quaternary ammonium structure formed after the reaction of trimethylamine has Hodman degradation and methyl hydrogen degradation, so the stability of the membrane is poor.
There is a serious degradation under alkaline conditions, which limits the application of the membrane, especially in alkaline fuel cells.

Method used

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  • Method for preparing brominated-polyphenylene-ether-guanidination-based homogeneous anion exchange membrane
  • Method for preparing brominated-polyphenylene-ether-guanidination-based homogeneous anion exchange membrane
  • Method for preparing brominated-polyphenylene-ether-guanidination-based homogeneous anion exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1 g of brominated polyphenylene ether (bromomethyl: 0.4 mmol) with a degree of methyl bromination of 5% was dissolved in 10 ml of toluene, and 0.5 ml of 1,1,2,3,3-pentamethyl-substituted guanidine (4.0 mmol, 10 equivalents), stirred and reacted in an ice-water bath (0° C.) for 6 hours to obtain a casting solution; the casting solution was scraped on a polyethylene film, and the solvent was evaporated at room temperature to obtain a homogeneous anion exchange membrane. Soak the membrane in 1mol L -1 In NaOH aqueous solution for 24h, it will be converted into OH - type anion exchange membrane.

[0025] p-brominated polyphenylene ether and the resulting OH - The infrared test of the type anion exchange membrane found that the stretching vibration peak corresponding to C-Br in the original brominated polyphenylene ether was 742cm -1 , and in the anion exchange membrane prepared in this example, the above C-Br peak disappeared, and at the same time at 1600cm -1 and 1397...

Embodiment 2

[0029] Dissolve 1 g of brominated polyphenylene ether (bromomethyl: 2.7 mmol) with a methyl bromination degree of 42% in 20 ml of N-methylpyrrolidone, and add 0.7 ml of 1,1,2,3,3-pentamethyl Substitute guanidine (5.4mmol, 2 equivalents), stir and react at 25°C for 24h to obtain a casting solution; scrape the casting solution on a glass plate, place it in an oven, and dry it at 30°C to obtain a homogeneous anion exchange membrane . Soak the membrane in 1mol L -1 In NaOH aqueous solution for 24h, it will be converted into OH - type anion exchange membrane.

[0030] The infrared test results of the anion exchange membrane prepared in this example are similar to the results of the infrared test in Example 1, indicating that the degree of reaction between bromomethyl and pentamethyl-substituted guanidine is relatively high.

[0031] Other properties of the test anion exchange membrane are as follows: water content 57.1%, ion exchange content 2.32mmolg -1 , the tensile strength ...

Embodiment 3

[0034] 1g of brominated polyphenylene ether (bromomethyl: 5.0mmol) with 100% degree of methyl bromination was dissolved in 40ml of chlorobenzene, and 0.32ml of 1,1,2,3,3-pentamethyl-substituted guanidine ( 2.5mmol, 0.5 equivalent), stirred and reacted at 25°C for 48h to obtain a casting solution; coated the casting solution on the surface of a polytetrafluoroethylene plate, placed in an oven, and dried at 130°C to obtain a homogeneous anion exchange membrane. Soak the membrane in 1mol L -1 In NaOH aqueous solution for 24h, it will be converted into OH - type anion exchange membrane.

[0035] Infrared testing of brominated polyphenylene ether and the final OH-type anion exchange membrane found that the stretching vibration peak corresponding to C-Br in the original brominated polyphenylene ether was 742cm -1 , the above-mentioned C-Br peak still exists in the anion exchange membrane prepared in this example, and at the same time at 1600cm -1 and 1397cm -1 Vibration peaks o...

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Abstract

The invention discloses a method for preparing a brominated-polyphenylene-ether-guanidination-based homogeneous anion exchange membrane. The method is characterized by comprising the following steps of: dissolving bromomethylated poly(2,6-dimethyl 1,4-phenylene oxide), namely brominated polyphenylene ether of which the degree of methyl bromination is 5 to 100 percent into an organic solvent, adding organic micromolecules 1,1,2,3,3-pentamethyl substituent carbamidine in a molar weight which is 0.5 to 10 times that of bromine methyl groups contained in the brominated polyphenylene ether, stirring the solution at the temperature of between 0 and 100 DEG C, reacting for 6 to 48 hours, directly coating casting film solution on the matrix or coating the casting film on reinforced fabrics, and removing the solvent to obtain the anion exchange membrane. In the method, the properties of the anion exchange membrane are controlled by controlling the degree of substitution of the bromine methyl groups of the brominated polyphenylene, so that the homogeneous anion exchange membrane having the advantages of proper water content, high ion exchange content, high thermal stability and mechanical strength and excellent OH-conductivity and alkali resistance can be selected.

Description

technical field [0001] The invention belongs to the field of membrane technology, in particular to a preparation method of a homogeneous anion exchange membrane based on guanidinylation of brominated polyphenylene ether. Background technique [0002] Since anion exchange membranes are widely used in seawater (brackish water) desalination, tap water dehardening, electrodialysis, diffusion dialysis, electrochemical sensing and fuel cells, their use and development have always attracted people's attention. The homogeneous anion membrane has the advantages of uniform structure, low resistance and stable performance due to the characteristics of the fixed ion-exchange groups in its own structure and the main body of the membrane connected by chemical bonds, making it widely used in the fields of electrodialysis and fuel cells. [0003] Chinese Patent Application No. 200810019008.7 discloses a copolymerization of small molecules with benzyl chloride and small molecules with alkoxy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C08J5/04C08G65/48C08L71/12B01J41/12H01M8/02H01M2/16B01J41/13H01M8/0239
CPCY02E60/12Y02E60/50
Inventor 徐铜文林小城
Owner UNIV OF SCI & TECH OF CHINA
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