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Cationic polymer containing branched structure, and preparation method and application thereof

A technology of cationic polymers and branched structures, which is applied in the field of anion exchange membrane materials, can solve problems such as damage to the stability of anion membranes, and achieve the effect of improving alkali resistance, anti-oxidation stability, and good anti-swelling performance

Pending Publication Date: 2022-01-21
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, researchers have proposed many methods to improve the conductivity of anion exchange membranes, such as increasing the ion exchange capacity (IEC) of the membrane, but high IEC generally brings higher water absorption to the membrane, and excessive water absorption rate will further damage the stability of the anion membrane

Method used

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  • Cationic polymer containing branched structure, and preparation method and application thereof
  • Cationic polymer containing branched structure, and preparation method and application thereof
  • Cationic polymer containing branched structure, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] In the present embodiment, the cationic polymer containing branched structure has the structural formula shown in formula (6):

[0061]

[0062] The specific method is: biphenyl (0.3g, 1.945mmol), 7-bromo-1,1,1-trifluoroheptan-2-one (0.5313g, 2.1506mmol), 1,3,5-triphenylbenzene ( 0.00298g, 9.727×10 -3 mmol), dichloromethane (2 mL) and trifluoromethanesulfonic acid (2 mL) were reacted at room temperature for 24 h to obtain a viscous polymer solution. After the reaction was completed, it was slowly added dropwise into methanol to obtain a white thick fibrous polymer. It is then filtered and washed well. After vacuum drying, 0.83 g of a white fibrous bromine-terminated polymer precursor was obtained.

[0063] The bromine-terminated polymer precursor was then dissolved in 15 mL of N-methylpyrrolidone, and a solution of 2.6 mL of trimethylamine (4.2 mol L -1 ethanol solution), after reacting at room temperature for 72 hours, the reaction system was slowly added to anh...

Embodiment 2

[0068] In the present embodiment, the cationic polymer containing branched structure has the structural formula shown in formula (7):

[0069]

[0070] The specific method is: m-terphenyl (0.6g, 2.6063mmol), 7-bromo-1,1,1-trifluoroheptan-2-one (0.722g, 2.9231mmol), 1,3,5-triphenyl Benzene (0.0159g, 5.21×10 -2 mmol), dichloromethane (2.6 mL) and trifluoromethanesulfonic acid (2.6 mL) were stirred at room temperature for 24 h to give a black gel-like material. After the reaction was completed, it was slowly added dropwise into methanol to obtain a white thick fibrous polymer. It is then filtered and washed well. After vacuum drying, 1.31 g of bromine-terminated precursor polymer was obtained as white fibers.

[0071] The bromine-terminated precursor polymer was then dissolved in 15 mL of N-methylpyrrolidone, and a solution of 2.2 mL of trimethylamine (4.2 mol L -1 ethanol solution), after reacting at room temperature for 72 hours, the reaction system was slowly added to a...

Embodiment 3

[0076] In the present embodiment, the cationic polymer containing branched structure has the structural formula shown in formula (8):

[0077]

[0078] The specific method is: biphenyl (0.3g, 1.945mmol), 7-bromo-1,1,1-trifluoroheptan-2-one (0.5313g, 2.1506mmol), 1,3,5-triphenylbenzene ( 0.00298g, 9.727×10 -3 mmol), dichloromethane (2 mL) and trifluoromethanesulfonic acid (2 mL) were stirred at room temperature for 24 h to give a black gel-like material. After the reaction was completed, it was slowly added dropwise into methanol to obtain a white thick fibrous polymer. It is then filtered and washed well. After vacuum drying, 0.67 g of bromine-terminated precursor polymer was obtained as white fibers.

[0079]Then the bromine-terminated precursor polymer was dissolved in 15 mL N-methylpyrrolidone, 1.51 mL N-methylpiperidine was added, and after 72 hours of reaction at room temperature, the reaction system was slowly added to anhydrous ether to obtain 0.7 g off-white fib...

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Abstract

The invention discloses a cationic polymer containing a branched structure, and a preparation method and application thereof. The structure of the polymer is shown in the description. An anion exchange membrane prepared on the basis of the polymer has the advantages of good swelling resistance, low water absorption, high conductivity and the like, and can be applied to electrochemical energy conversion devices such as fuel cells, flow cells and electrolyzed water.

Description

technical field [0001] The invention belongs to the field of anion exchange membrane materials, and in particular relates to a cationic polymer containing a branched structure, a preparation method and application thereof. Background technique [0002] With the increasing demand for energy in human society and the increasing concern for environmental issues, the development and application of clean energy has received more and more attention. Anion-exchange membrane fuel cells (AEMFCs) have attracted extensive attention due to their high energy conversion efficiency and the use of non-noble metals as electrode catalysts. As the core component of AEMFC, anion exchange membrane can isolate fuel and conduct ions, which directly affects the efficiency and service life of fuel cells. [0003] To realize the application of anion membrane in fuel cells, it needs to meet the basic conditions of high ionic conductivity, good chemical stability and excellent mechanical properties. F...

Claims

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Application Information

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IPC IPC(8): C08G61/02C08G61/12C08J5/22C08L65/00B01J41/13
CPCC08G61/02C08G61/121C08J5/2262B01J41/13C08J2365/00C08G2261/122C08G2261/132C08G2261/146C08G2261/312C08G2261/3142Y02E60/50
Inventor 魏海兵李利娟朱红芳丁运生江涛凌乾竣
Owner HEFEI UNIV OF TECH
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