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A kind of polypiperazinium functionalized anion exchange membrane and preparation method thereof

An anion exchange membrane, piperazinium technology, applied in the field of polypiperazine functionalized anion exchange membrane and its preparation, can solve the problems of high water absorption and swelling, poor dimensional stability, low ionic conductivity and the like, and improve the vanadium resistance performance. , good stability, high ion selectivity

Active Publication Date: 2021-12-03
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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  • A kind of polypiperazinium functionalized anion exchange membrane and preparation method thereof
  • A kind of polypiperazinium functionalized anion exchange membrane and preparation method thereof
  • A kind of polypiperazinium functionalized anion exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 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.

[0029] The obtained dopiperazinium-functionalized 4,4'-biphenol has the following structure (R is H; n=0):

[0030]

[0031] 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

[0038] Synthesis of polypiperazinium functionalized 4,4'-biphenol: same as Example 1

[0039] 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 (3 mmol) of 4,4'-biphenol was dissolved in DMAC, then 2.0732 g (15 mmol) 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 Pour into deionized water to precipitate, filter, alternately wash several times with deionized water and ethanol, and dry to obtain a dopiperazinium functionalized polymer;

[0040]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 time ...

Embodiment 3

[0046] Synthesis of polypiperazinium functionalized 4,4'-biphenol: same as Example 1

[0047] Synthesis of polypiperazinium functionalized polymer: under the protection of inert gas, 3.6954g (9mmol) of polypiperazinium functionalized 4,4'-biphenol, 3.3411g (10mmol) of decafluorobiphenyl and 0.1862 g (1 mmol) of 4,4'-biphenol was dissolved in DMAC, then 2.0732 g (15 mmol) 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 Pour into deionized water to precipitate, filter, alternately wash several times with deionized water and ethanol, and dry to obtain a dopiperazinium functionalized polymer;

[0048] 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 reaction time...

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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 anion exchange membranes, and provides a polypiperazinium functionalized anion exchange membrane and a preparation method thereof. A polypiperazinium-functionalized polymer with good dimensional stability and mechanical properties is obtained, and then the polymer is quaternized to obtain a dopiperazinium-functionalized polymer, and a film is formed. The prepared membrane has good dimensional stability and good ion conductivity, and can be applied in 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 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 capacity; hi...

Claims

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Application Information

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Patent Type & Authority Patents(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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