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Block type anion exchange membrane containing dense ion strings, and preparation method thereof

An anion exchange membrane, block type technology, applied in the field of anion exchange membrane and its synthesis, can solve the problems of decreased mechanical strength, weakened dimensional stability, swelling, etc.

Inactive Publication Date: 2020-10-20
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ion exchange capacity of the membrane is too high, which is prone to severe swelling, weakens the dimensional stability, and leads to a decrease in mechanical strength, making it difficult for practical application.

Method used

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  • Block type anion exchange membrane containing dense ion strings, and preparation method thereof
  • Block type anion exchange membrane containing dense ion strings, and preparation method thereof
  • Block type anion exchange membrane containing dense ion strings, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In this example, the synthesis of a phenolphthalein-based block-type anion exchange membrane (m:n=20:20) containing densely packed ion strings is taken as an example. The structural formula is as follows:

[0052]

[0053] where R is H or Concrete preparation method comprises the following steps:

[0054] 1) Synthesis of hydrophilic segment oligomers: 7.489g (20mmol, ie m=20) 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), 5.453g (19mmol, ie m-1=19) of 4,4'-dichlorodiphenylsulfone, 4.789g (35mmol) of anhydrous potassium carbonate and 15mL of toluene were dissolved in 25mL of N,N-dichlorodiphenyl sulfone Methylacetamide, under nitrogen protection, reacted at 145°C for 4.5h, then raised the temperature to 170°C for 12h, then added 0.375g (1.0mmol, ie 0.05mmol) of 3,3-bis(4-hydroxy-3, 5-Dimethylphenyl)phthalide, continue to react at 170°C for 1h, after cooling, use 400mL methanol aqueous solution (the...

Embodiment 2

[0062] In this example, the synthesis of a phenolphthalein-based block-type anion exchange membrane (m:n=20:10) containing dense ion strings is taken as an example. The structural formula is as follows,

[0063]

[0064] where R is H or Concrete preparation method comprises the following steps:

[0065] 1) Synthesis of hydrophilic segment oligomers: 7.489g (20mmol, i.e. m=20) of 3,3-bis(4-hydroxyl-3,5-dimethylphenyl)phthalide, 5.453g ( 19mmol, that is, m-1=19) of 4,4'-dichlorodiphenylsulfone, 4.789g (35mmol) of anhydrous potassium carbonate and 15mL of toluene were dissolved in 25mL of N,N-dimethylacetamide, under nitrogen protection, React at 145°C for 4.5h, then raise the temperature to 170°C for 12h, then add 0.375g (1.0mmol, 0.05mmol) of 3,3-bis(4-hydroxy-3,5-dimethylphenyl) For phthalide, continue to react at 170°C for 1 h, and after cooling, precipitate with 400 mL methanol aqueous solution (the volume ratio of methanol to water is 1:1), filter, wash, and dry to ob...

Embodiment 3

[0072] In this example, a dense ion-series poly(arylene ether nitrile ketone) block-type anion exchange membrane (m:n=20:20) containing three quaternary ammonium cations was synthesized. The structural formula is as follows,

[0073]

[0074] where R is H or Concrete preparation method comprises the following steps:

[0075] 1) Synthesis of hydrophilic segment oligomers: 7.489g (20mmol, i.e. m=20) of 3,3-bis(4-hydroxy-3,5-dimethylphenyl)phthalide, 4.769g ( 19mmol) (i.e. m-1=19) of 4,4'-dichlorobenzophenone, 4.689g (34mmol) of anhydrous potassium carbonate and 14mL toluene were dissolved in 25mL N,N-dimethylacetamide, nitrogen Protection, first react at 150°C for 4.5h, then raise the temperature to 168°C for 12h, then add 0.375g (1.0mmol, ie 0.05mmol) of 3,3-bis(4-hydroxy-3,5-dimethylbenzene Base) phthalide, continue to react at 168°C for 1h, after cooling, precipitate with 400mL methanol aqueous solution (the volume ratio of methanol to water is 1:1), filter, wash, and d...

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Abstract

The invention provides a block type anion exchange membrane containing dense ion strings, and a preparation method thereof, wherein the block type anion exchange membrane can be used for an alkaline fuel cell, and is structurally characterized in that a plurality of ion strings are densely grafted on a hydrophilic segment of a block copolymer to serve as functional groups. The preparation method mainly comprises the following steps: (1) preparing a hydrophilic segment containing tetraphenylmethyl and a hydrophobic segment containing a suspended nitrile group; (2) preparing a block copolymer, and carrying out bromination modification; and (3) preparing the block type anion exchange membrane containing the dense ion strings. According to the invention, the anion exchange membrane prepared bythe method has a developed ion transmission channel, has the characteristics of high water content and low swelling rate, and overcomes the defect that the existing anion exchange membrane cannot have high water content, high conductivity and low swelling rate at the same time; and a highly toxic carcinogenic chloromethyl ether reagent is not used in the preparation process, so that the membranehas a wide application prospect in the field of alkaline fuel cells.

Description

technical field [0001] The invention belongs to the field of alkaline fuel cells, and in particular 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 reaction technology to directly and efficiently convert the chemical energy stored in fuel and oxidant into electrical energy. It has the advantages of high efficiency, high energy density, environmental friendliness, and portability. For the 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 due to their high electrode reactivity, the ability to use non-noble metal electrode catalysts, and low corrosion. The research hotspot in the field of fuel cell, from the point of view of saving energy and protecting the environment, fuel cell is the most promising power ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08G81/00H01M8/083H01M8/1027H01M8/103H01M8/1069C08L87/00
CPCC08J5/2256C08G81/00H01M8/1027H01M8/103H01M8/1069H01M8/083C08J2387/00Y02E60/50
Inventor 赖傲楠王贞郑经纬周树锋
Owner HUAQIAO UNIVERSITY
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