Polyarylene piperidine amphoteric ion exchange membrane without aryl ether bond and preparation method thereof

A polyarylpiperidine and zwitterion technology, which is applied to polyarylpiperidine-based zwitterion exchange membranes without aryl ether bonds and the field of preparation thereof, can solve the problem of unstable aryl ether bond structure and cracking of polymer main chains. and other problems to achieve the effect of improving vanadium resistance, good stability and high ionic conductivity

Active Publication Date: 2020-08-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, most of the widely studied ion exchange membranes are made of polymers with aryl ether bond main chain structure, and the aryl ether bond structure is unstable, which easily leads to the cracking of the polymer main chain.

Method used

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  • Polyarylene piperidine amphoteric ion exchange membrane without aryl ether bond and preparation method thereof
  • Polyarylene piperidine amphoteric ion exchange membrane without aryl ether bond and preparation method thereof
  • Polyarylene piperidine amphoteric ion exchange membrane without aryl ether bond and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 2.5 g of biphenyl was dissolved in 6 mL of dichloromethane, then 2.23 mL of N-methyl-4-piperidone was added. In order to avoid violent fuming after the addition of strong acid, 1.21 mL of trifluoroacetic acid was added dropwise under conditions of ice-water bath and nitrogen gas, followed by 14.4 mL of trifluoromethanesulfonic acid. With the addition of trifluoromethanesulfonic acid, the solution turned from yellow via orange / red to a brown homogeneous solution, which remained so during the reaction. During the polymerization reaction, the reaction vessel was placed in an ice bath to suppress the occurrence of side reactions. After 3 hours of reaction, when the viscosity of the reactant increased to the point where mechanical stirring was difficult, the reaction was stopped. First, in the reaction vessel, slowly add dimethyl sulfoxide to dissolve the polymerized reaction product main chain polymer, then take 5M NaOH solution (500-1000mL) in a beaker, and slowly pour th...

Embodiment 2

[0026] The main chain polymer was prepared as described in Example 1. 1.0 g of the main chain polymer was added to 30 mL of dimethyl sulfoxide and stirred to form a white emulsion. Feed propane sultone, KI and the main chain polymer at a ratio of 0.1:0.1:1, stir at 60°C for 48 hours, and react to obtain a uniform orange solution. The solution was slowly poured into the stirred ethyl acetate solution to precipitate a zwitterionic polymer with a graft degree of 10%.

[0027] The product was washed several times with ethyl acetate, filtered with suction, and dried in a constant temperature drying oven. Dissolve 0.15 g of amphoteric polymer in 4 mL of dimethyl sulfoxide, and cast at 50° C. for 24 h to form a film. The membrane was soaked in deionized water for 12 h at room temperature to remove impurities. Then, the membrane was soaked in acid for 12h to make it fully ion exchanged. The membrane is then soaked in deionized water to remove excess acid. The water absorption of t...

Embodiment 3

[0029] The main chain polymer was prepared as described in Example 1. 1.0 g of the main chain polymer was added to 30 mL of dimethyl sulfoxide and stirred to form a white emulsion. Feed propane sultone, KI and the main chain polymer at a ratio of 0.2:0.2:1, stir at 60°C for 48 hours, and react to obtain a uniform orange solution. The solution was slowly poured into the stirred ethyl acetate solution to precipitate a zwitterionic polymer with a graft degree of 20%.

[0030]The product was washed several times with ethyl acetate, filtered with suction, and dried in a constant temperature drying oven. Dissolve 0.15 g of amphoteric polymer in 4 mL of dimethyl sulfoxide, and cast at 50° C. for 24 h to form a film. The membrane was soaked in deionized water for 12 h at room temperature to remove impurities. Then, the membrane was soaked in acid for 12h to make it fully ion exchanged. The membrane is then soaked in deionized water to remove excess acid. The water absorption of th...

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Abstract

The invention belongs to the technical field of membranes, and provides a polyarylpiperidine amphoteric ion exchange membrane containing no aryl ether bonds and a preparation method thereof. A membrane material contains positive quaternary amine groups and negative sulfonic acid groups and contains no aryl ether bonds. The polyarylpiperidine amphoteric ion exchange membrane has the advantages thatby introducing amphoteric ion groups, the ionic conduction capacity and the vanadium resisting performance of the membrane can be effectively improved, the membrane is high in ionic conductivity andionic selectivity. Besides, when polyarylpiperidine polymers containing no aryl ether bonds are adopted, the stability of the membrane is greatly improved.

Description

technical field [0001] The invention belongs to the field of membrane technology, and relates to an amphoteric ion exchange membrane and a preparation method thereof, in particular to a preparation method of a polyaryl piperidine type amphoteric ion exchange membrane without aryl ether bonds. Background technique [0002] In recent years, with the continuous reduction of non-renewable energy reserves and its serious pollution to the environment, some renewable energy sources such as solar energy and wind energy have received more and more attention. However, these renewable energy sources are not sustainable, so a large-scale energy storage system - all vanadium redox flow battery has become the focus of research in the new energy industry. It has long service life, deep charge and discharge, and fast response. , flexible design, pollution-free and so on. [0003] The ion exchange membrane is one of the key components of the all-vanadium redox flow battery, and it is the ke...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G61/12H01M8/1023H01M8/18
CPCC08G61/124C08G2261/124C08G2261/312C08G2261/3222C08G2261/516C08G2261/722H01M8/1032H01M8/188Y02E60/50
Inventor 焉晓明张华清贺高红胡钟月代岩郑文姬阮雪华
Owner DALIAN UNIV OF TECH
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