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Novel polypiperazinium functionalized anion exchange membrane and preparation method thereof

An anion-exchange membrane and piperazinium technology, which is applied in the field of new-type polypiperazinium functionalized anion-exchange membrane and its preparation, can solve the problems of poor dimensional stability, high water absorption swelling, and low ion conductivity, and achieve improved vanadium barrier performance, good stability, and high ion selectivity

Active Publication Date: 2021-04-20
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, polymers such as polysulfone, polybenzimidazole, and polyphenylene ether are commonly used as the main chain for membrane materials, but some polymers have problems of low ion conductivity, high water swelling, and poor dimensional stability.

Method used

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  • Novel polypiperazinium functionalized anion exchange membrane and preparation method thereof
  • Novel polypiperazinium functionalized anion exchange membrane and preparation method thereof
  • Novel polypiperazinium functionalized anion exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Synthesis of polypiperazinium functionalized 4,4'-biphenol: In a 250mL round bottom flask, 3.7242g (20mmol) of 4,4'-biphenol was dissolved in 40mL of ethanol, and after 1 hour, the reaction The container was placed in an ice bath, and after the reaction solution was lowered to 0° C., 4.0471 g (40 mmol) of N-methylpiperazine and 5.9 mL of formaldehyde in water were added. The solution was stirred at 25°C for 24 hours. The viscous solid was collected by rotary evaporation and washed several times with dichloromethane by rotary evaporation. It was recrystallized with ether, filtered, and dried under vacuum at 30°C for 12 hours to obtain off-white powder.

[0028] The obtained dopiperazinium-functionalized 4,4'-biphenol has the following structure (R is H; n=0):

[0029]

[0030] Synthesis of polypiperazinium functionalized polymer: under the protection of inert gas, 1.6424g (4mmol) of polypiperazinium functionalized 4,4'-biphenol, 3.3411g (10mmol) of decafluorobipheny...

Embodiment 2

[0037] Synthesis of polypiperazinium functionalized 4,4'-biphenol: same as Example 1

[0038] Synthesis of polypiperazinium functionalized polymer: under the protection of inert gas, 2.8742g (7mmol) of polypiperazinium functionalized 4,4'-biphenol, 3.3411g (10mmol) of decafluorobiphenyl and 0.5586 g (3mmol) of 4,4'-biphenol was dissolved in DMAC, then 2.0732g (15mmol) of potassium carbonate was added, refluxed at 80°C for 6h to remove water, and then kept at a constant temperature of 85°C for 48h; the reaction solution was poured Precipitate in deionized water, filter, alternately wash several times with deionized water and ethanol, and dry to obtain the polypiperazinium functionalized polymer;

[0039]The quaternization of the polypiperazinium functionalized polymer: get the reaction product polymer 3.1809g (5mmol) obtained in the previous step and join in DMAC, stir to form a white emulsion, then add 1.9872g (14mmol) of methyl iodide respectively , at 45°C, the reaction tim...

Embodiment 3

[0045] Synthesis of polypiperazinium functionalized 4,4'-biphenol: same as Example 1

[0046] Synthesis of polypiperazinium functionalized polymer: under the protection of an inert gas, 3.6954 g (9 mmol) of polypiperazinium functionalized 4,4'-biphenol, 3.3411 g (10 mmol) of decafluorobiphenyl and 0.1862 g (1mmol) of 4,4'-biphenol was dissolved in DMAC, then 2.0732g (15mmol) of potassium carbonate was added, refluxed at 80°C for 6h to remove water, and then kept at a constant temperature of 85°C for 48h; the reaction solution was poured Precipitate in deionized water, filter, alternately wash several times with deionized water and ethanol, and dry to obtain the polypiperazinium functionalized polymer;

[0047] The quaternization of the polypiperazinium functionalized polymer: get the reaction product polymer 3.4093g (5mmol) obtained in the previous step and join in DMAC, stir to form a white emulsion, then add 2.5549g (18mmol) of methyl iodide respectively , at 45°C, the reac...

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Abstract

The invention belongs to the technical field of anion exchange membranes, aims to improve the ion transfer performance and dimensional stability of an anion exchange membrane, and provides a novel polypiperazinium functionalized anion exchange membrane and a preparation method thereof. According to the preparation method, a polypiperazinium-containing functionalized polymer with good dimensional stability and mechanical properties is synthesized, quaternization is carried out on the polymer to obtain the polypiperazinium-containing functionalized polymer, and the polypiperazinium-containing functionalized polymer is made into a membrane. The prepared membrane has relatively good dimensional stability and relatively good ionic conductivity, and can be applied to neutral and all-vanadium redox flow batteries.

Description

technical field [0001] The invention belongs to the technical field of anion exchange membranes, and relates to a novel polypiperazinium functionalized anion exchange membrane and a preparation method thereof. Background technique [0002] The demand for scientific applications of renewable energy is growing rapidly, and it is essential to develop low-cost and high-efficiency large-scale energy storage systems to eliminate the intermittency of renewable energy. As one of the most promising large-scale energy storage systems, redox flow batteries (RFBs) have attracted great attention in recent years. Membrane is one of the key components of RFB, which not only affects the overall cycle performance but also determines the economic viability of the system. The membrane separates the positive and negative half-cells and prevents cross-mixing of active species at the two poles while providing the desired ionic conductivity. An ideal membrane should have good ion exchange capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J41/09
Inventor 焉晓明肖燕贺高红潘昱姜晓滨吴雪梅
Owner DALIAN UNIV OF TECH
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