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Anion exchange membrane containing dense flexible ion strings and preparation method of anion exchange membrane

An anion exchange membrane, ion technology, applied in the field of membrane science, can solve the problems of weakened dimensional stability, decreased mechanical strength, failure, etc., to achieve good chemical stability and thermal stability, improved membrane conductivity, increased density and The effect of agglomeration

Inactive Publication Date: 2020-11-03
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ion-exchange capacity value of AEMs is too high, which is prone to severe swelling, which weakens the dimensional stability, leads to a decrease in mechanical strength, and fails in practical applications.

Method used

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  • Anion exchange membrane containing dense flexible ion strings and preparation method of anion exchange membrane
  • Anion exchange membrane containing dense flexible ion strings and preparation method of anion exchange membrane
  • Anion exchange membrane containing dense flexible ion strings and preparation method of anion exchange membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0046] In this example, 6-(dimethylamino)-N-ethyl-N,N-dimethylhexane-1-ammonium bromide was used as the quaternization reagent to synthesize polyaryl ether sulfone type containing dense flexible ion strings The anion exchange membrane has the following structural formula:

[0047]

[0048] where R is H or

[0049] Concrete preparation method comprises the following steps:

[0050] 1) Synthesis of polyarylethersulfone polymer: 7.489g (20mmol) of 3,3-bis(4-hydroxy-3,5-dimethylphenyl)phthalide (CAS No.: 3689-45-0, C 24 h 22 o 4 , molecular weight 374.43), 5.085g (20mmol) of 4,4'-difluorodiphenyl sulfone, 4.789g (35mmol) of anhydrous potassium carbonate and 10mL of toluene dissolved in N,N-dimethylacetamide, nitrogen protection, First react at 145°C for 4.5h, then raise the temperature to 170°C for 11h, and then cool the reaction solution to room temperature. Add 2.782g (20mmol) of 2,6-difluorobenzonitrile and 6.367g (20mmol) of phenolphthalein to the above reaction sol...

Embodiment 2

[0056] In this example, 6-(dimethylamino)-N,N,N-trimethylhexane-1-ammonium bromide was used as a quaternization reagent to synthesize a polyaryletherketone anion exchange membrane containing flexible ion strings. For example, the structural formula is as follows:

[0057]

[0058] where R is H or

[0059] Concrete preparation method comprises the following steps:

[0060] 1) Synthesis of polyaryletherketone polymer: 4.364g (20mmol) of 4,4'-difluorobenzophenone, 7.489g (20mmol) of 3,3-bis(4-hydroxyl-3,5- Dimethylphenyl)phthalide, 4.789g (35mmol) of anhydrous potassium carbonate and 12mL of toluene were dissolved in N,N-dimethylacetamide, under nitrogen protection, reacted at 145°C for 4.5h, and then heated to 170°C After reacting for 11 h, the reaction solution was cooled to room temperature. Then add 4.364g (20mmol) of 4,4'-difluorobenzophenone and 6.367g (20mmol) of phenolphthalein to the above reaction solution, raise the temperature to 145°C for 4.5h, then raise the...

Embodiment 3

[0065] This embodiment takes the synthesis of polyarylether sulfone ketone anion exchange membrane containing three cation flexible ion strings with 12 carbon atoms as an example. The structural formula is as follows:

[0066]

[0067] where R is H or Br or

[0068] Concrete preparation method comprises the following steps:

[0069] 1) Synthesis of polyaryl ether sulfone ketone polymer: 5.085g (20mmol) of 4,4'-difluorodiphenyl sulfone, 7.489g (20mmol) of 3,3-bis(4-hydroxyl-3,5- Dimethylphenyl)phthalide, 4.789g (35mmol) of anhydrous potassium carbonate and 10mL of toluene were dissolved in N,N-dimethylacetamide, under nitrogen protection, reacted at 145°C for 4.5h, and then heated to 170°C After reacting for 12 h, the reaction solution was cooled to room temperature. Then add 4.364g (20mmol) of 4,4'-difluorobenzophenone and 6.367g (20mmol) of phenolphthalein to the above reaction solution, raise the temperature to 145°C for 4.5h, then raise the temperature to 180°C for 8...

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Abstract

The invention provides an anion exchange membrane containing dense flexible ion strings and a preparation method of the anion exchange membrane. The anion exchange membrane can be used for alkaline fuel cells. The anion exchange membrane is structurally characterized in that a polymer main chain structure containing phenolphthalein side groups is densely grafted with flexible ion strings containing a plurality of ion groups to serve as functional groups. The preparation method mainly comprises the following steps: (1) preparing a phenolphthalein-based polymer containing four benzyl groups; (2)carrying out bromination modification on benzyl on the polymer; and (3) preparing an anion exchange membrane containing dense flexible ion strings. The anion exchange membrane prepared by the methodhas a developed ion transmission channel, has the characteristics of high ionic conductivity and low swelling rate, does not use a highly toxic carcinogenic chloromethyl ether reagent in the preparation process, and has a wide application prospect in the field of alkaline fuel cells.

Description

technical field [0001] The invention belongs to the field of membrane science and technology, and specifically relates to an anion exchange membrane and a synthesis method thereof. Background technique [0002] Fuel cell (Fuel Cell) is a power generation device that uses chemical reactions to directly and efficiently convert the chemical energy stored in fuels and oxidants into electrical energy. It has the advantages of high efficiency, high energy density, environmental friendliness, and portability. Fourth generation power generation technology. At present, alkaline anion-exchange membrane fuel cells (AEMFCs) using anion-exchange membranes (AEMs) as polyelectrolytes have attracted much attention because of their high electrode reactivity, non-noble metal electrode catalysts, and low corrosion. Current research hotspots in the field of fuel cells. Among them, the anion exchange membrane is a key component of AEMFCs, which plays a role in conducting OH - The role of ions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D67/00B01J41/13C08G65/48
CPCB01D67/0006B01D71/82B01D2323/36B01D2325/42B01J41/13C08G65/485
Inventor 赖傲楠王贞胡鹏程周树锋
Owner HUAQIAO UNIVERSITY
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