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Method for preparing alkaline anion exchange membrane based on branched oxygen-free main chain

A basic anion and main chain technology, applied in the field of preparation of branched cationic alkaline anion membranes, can solve the problems of low electrical conductivity and poor chemical stability, and achieve the effect of improving electrical conductivity and enhancing alkali resistance.

Active Publication Date: 2020-01-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still many problems on the road to the commercialization of alkaline polymer fuel cells. Alkaline anion exchange membranes, as a key material for fuel cells, have two major problems: low electrical conductivity and poor chemical stability in alkaline environments.

Method used

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  • Method for preparing alkaline anion exchange membrane based on branched oxygen-free main chain
  • Method for preparing alkaline anion exchange membrane based on branched oxygen-free main chain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Prepare a polymer main chain with a branching degree of 1. Take 0.0199g of 1,3,5-triphenylbenzene and 0.9873g of biphenyl into a 25ml round bottom flask, then add 2.8ml of dichloromethane and stir at room temperature until completely dissolved, then add 0.41mL of N-methylpiperidone and 0.45 mL of trifluoroacetone, then put the round bottom flask into ice bath, then add 0.64mL of trifluoroacetic acid and 6.8mL of trifluoromethanesulfonic acid dropwise using a constant pressure funnel and stir for 5h, then pour the mixture into 1M NaOH solution for washing After 12 hours, it was washed with deionized water until neutral to obtain a solid product, and the obtained solid was dried in a vacuum oven at 50° C. for 48 hours.

[0033] (2) Preparation of ionizing reagents. Measure 24.28mL of 1,6-dibromohexane and 12.09mL of N-methylpiperidine into a 100mL round bottom flask, then add 40mL of ethyl acetate into the flask, stir at room temperature until completely dissolved, t...

Embodiment 2

[0039] (1) Prepare a polymer main chain with a branching degree of 3. Take 0.0597g ​​of 1,3,5-triphenylbenzene and 0.9573g of biphenyl into a 25ml round bottom flask, add 2.8ml of dichloromethane and stir at room temperature until completely dissolved, then add 0.41mL of N-methylpiperidone and 0.45 mL of trifluoroacetone, then put the round-bottom flask into an ice bath, then add 0.64 mL of trifluoroacetic acid and 6.8 mL of trifluoromethanesulfonic acid dropwise using a constant pressure funnel, stir for 3 h, and then pour the mixture into 1M NaOH solution After washing for 12 hours, it was washed with deionized water until neutral to obtain a solid product, and the obtained solid was dried in a vacuum oven at 50° C. for 48 hours.

[0040] (2) Preparation of ionizing reagents. Measure 32.37mL of 1,6-dibromohexane and 12.09mL of N-methylpiperidine into a 100mL round bottom flask, then add 40mL of ethyl acetate into the flask, stir at room temperature until completely dissolve...

Embodiment 3

[0046] (1) Prepare a polymer main chain with a branching degree of 5. Take 0.0996g of 1,3,5-triphenylbenzene and 0.9272g of biphenyl into a 25ml round bottom flask, add 2.8ml of dichloromethane and stir at room temperature until completely dissolved, then add 0.41mL of N-methylpiperidone and 0.45 mL of trifluoroacetone, then put the round-bottomed flask in an ice bath, then add 0.64 mL of trifluoroacetic acid and 6.8 mL of trifluoromethanesulfonic acid dropwise using a constant pressure funnel, stir for 2 h, and then introduce the mixture into 1M NaOH solution for washing After 12 hours, it was washed with deionized water until neutral to obtain a solid product, and the obtained solid was dried in a vacuum oven at 50° C. for 48 hours.

[0047] (2) Preparation of ionizing reagents. Measure 80.92mL of 1,6-dibromohexane and 12.09mL of N-methylpiperidine into a 100mL round bottom flask, then add 120mL of ethyl acetate into the flask, stir at room temperature until completely diss...

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Abstract

A method for preparing an alkaline anion exchange membrane based on a branched oxygen-free main chain belongs to the field of battery membrane materials. The method comprises: firstly, dissolving 1,3,5-triphenylbenzene, N-methylpiperidone, biphenyl and trifluoroacetone in a solvent, adding an catalyst under an ice bath condition, and obtaining a polymer main chain having a branching degree of 1 to5 after a reaction; secondly, dissolving and reacting N-methylpiperidine and 1,6-dibromohexane in ethyl acetate, and then processing an obtained product ionization reagent; finally, performing the ionization of the polymer membrane main chain, casting membrane, and alkali treatment to obtain an anion exchange membrane. The method reduces the risk that hydroxide attacks the membrane by using the oxygen-free main chain, thereby enhancing the alkali resistance of the anion exchange membrane. The branched structure provides a certain free volume to help build ion transmission channels, and the ion reagent can promote the formation of ion clusters as well as the separation of hydrophilic and hydrophobic microphases, thereby significantly improving the conductivity of the membrane.

Description

technical field [0001] The invention belongs to the field of battery membrane materials, and relates to a preparation method of a branched cationic alkaline anion membrane based on an oxygen-free main chain. Background technique [0002] Energy crisis and environmental pollution have become the two most important problems facing today's society. As a new type of clean energy, fuel cells have attracted widespread attention from all over the world. Alkaline polymer fuel cells have achieved rapid development due to their fast reaction kinetics, the ability to use a small amount of noble metal or non-noble metal catalysts, no carbonate crystallization, and low fuel permeability. [0003] However, there are still many problems on the road to the commercialization of alkaline polymer fuel cells. Alkaline anion exchange membranes, as a key material for fuel cells, have two major problems: low electrical conductivity and poor chemical stability in alkaline environments. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1072H01M8/1086C08G61/10
CPCH01M8/1072H01M8/1086C08G61/10C08G2261/12C08G2261/312C08G2261/72Y02E60/50
Inventor 张凤祥白雷贾亚斌马玲玲李旅周芮霆
Owner DALIAN UNIV OF TECH
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