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Block copolymer anion-exchange membrane for fuel battery and preparation method of block copolymer anion-exchange membrane

An anion exchange membrane and block copolymer technology, which is used in fuel cell parts, fuel cells, solid electrolyte fuel cells, etc., can solve the problem of increased water content and electrical conductivity, decreased fuel cell performance, and poor anti-swelling performance. and other problems, to achieve the effect of enhancing water retention capacity, enhancing anti-swelling performance, and controllable degree of bromination

Active Publication Date: 2015-04-22
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prepared membrane can have a high ion exchange capacity, but because the membrane material is based on ordinary random polymers, the swelling resistance is poor, and the swelling of the membrane increases correspondingly when the water content and electrical conductivity of the membrane increase, and finally Reduced mechanical strength of the membrane, resulting in reduced fuel cell performance
Li's research group (Journal of Membrane Science (2013, 436, 202-212)) prepared anion exchange membranes by synthesizing block copolymers, which exhibited higher electrical conductivity and mechanical properties than random polymer membranes, but at high ion The anti-swelling performance is still poor when the capacity is exchanged, and the preparation process uses chloromethyl ether reagent

Method used

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  • Block copolymer anion-exchange membrane for fuel battery and preparation method of block copolymer anion-exchange membrane
  • Block copolymer anion-exchange membrane for fuel battery and preparation method of block copolymer anion-exchange membrane
  • Block copolymer anion-exchange membrane for fuel battery and preparation method of block copolymer anion-exchange membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0032] In this example, the synthesis of a block polyarylether nitrile sulfone anion exchange membrane with 20 hydrophilic segments and 20 hydrophobic segments is taken as an example. The structural formula is as follows, and the specific preparation method includes the following steps:

[0033]

[0034] Among them, m=20, n=20, R is H or

[0035] 1) Synthesis of the hydrophilic segment: 7.489g (20mmol) (ie m=20) of 3,3-bis(4-hydroxy-3,5-dimethylphenyl)phthalide, 5.334g (21mmol) (i.e. m+1=21) 4,4'-difluorodiphenyl sulfone, 4.789g of anhydrous potassium carbonate and some toluene were dissolved in N,N-dimethylacetamide, under nitrogen protection, and reacted at 145°C After 4.5h, the temperature was raised to 170°C for 12h, then 0.267g (1.05mmol) (5% (m+1)) of 4,4'-difluorodiphenylsulfone was added, and the reaction was continued at 170°C for 1h, cooled Afterwards, it is precipitated with aqueous methanol (the volume ratio of methanol to water is 1 / 1), filtered, washed, and...

Embodiment 2

[0043] In this example, the synthesis of a block polyarylether nitrile sulfone anion exchange membrane with 10 hydrophilic segments and 20 hydrophobic segments is taken as an example. The structural formula is as follows, and the specific preparation method includes the following steps:

[0044]

[0045] Among them, m=10, n=20, R is H or

[0046] 1) Synthesis of the hydrophilic segment: 3.745g (10mmol) (ie m=10) of 3,3-bis(4-hydroxy-3,5-dimethylphenyl)phthalide, 2.794g (11mmol) (i.e. m+1=11) 4,4'-difluorodiphenyl sulfone, 2.395g of anhydrous potassium carbonate and some toluene were dissolved in N,N-dimethylacetamide, under nitrogen protection, and reacted at 145°C After 4.5h, the temperature was raised to 165°C for 12h, then 0.134g (0.55mmol) (5% (m+1)) of 4,4'-difluorodiphenylsulfone was added, and the reaction was continued at 165°C for 1h, cooled Afterwards, it is precipitated with aqueous methanol (the volume ratio of methanol to water is 1 / 1), filtered, washed, and...

Embodiment 3

[0054] This example takes the synthesis of guanidine functionalized block polyarylether nitrile sulfone anion exchange membrane as an example, the structural formula is as follows:

[0055]

[0056] Among them, m=20, n=20, R is H or

[0057] Except for the following features, other detailed steps and testing methods of the preparation method in this embodiment are the same as in Example 1.

[0058] 1) Synthesis of the hydrophilic segment: the reactant is 7.489g (20mmol) (i.e. m=20) of 3,3-bis(4-hydroxyl-3,5-dimethylphenyl)phthalide, 3.994g ( 21mmol) (ie m+1=21) of 3,3'-difluorobiphenyl, 3.456g of anhydrous potassium carbonate, and the polar aprotic solvent is N-methylpyrrolidone.

[0059] 2) Synthesis of the hydrophobic segment: the reactants are 2.782g (20mmol) (ie n=20) of 2,6-difluorobenzonitrile, 5.256g (21mmol) (ie n+1=21) of 4,4' - Sulfonyldiphenol, 4.146 g of anhydrous potassium carbonate, the polar aprotic solvent being N-methylpyrrolidone.

[0060] 3) Synthesi...

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Abstract

The invention discloses a block copolymer anion-exchange membrane for a fuel battery and a preparation method of the block copolymer anion-exchange membrane, and relates to an alkaline fuel battery. The molecular structure of the block copolymer anion-exchange membrane comprises a hydrophilic segment containing a phenolphthalein side group and a hydrophobic segment containing a benzonitrile structure. The preparation method comprises the following steps: (1) synthesizing the hydrophilic segment; (2) synthesizing the hydrophobic segment; (3) synthesizing a block copolymer; (4) synthesizing a bromomethylated block copolymer; and (5) preparing the block copolymer anion-exchange membrane. In the preparation process, a chloromethyl ether reagent is not used, and a phenolphthalein side group structure is introduced into the hydrophilic segment of the membrane and a strong-polarity nitrile group structure is introduced into the hydrophobic segment of the membrane by virtue of molecular design to ensure that the membrane has the characteristics of developed ion transport passage, high water content and low swelling capacity, and shows relatively high ionic conductivity and relatively good fuel battery performance.

Description

technical field [0001] The invention relates to an alkaline fuel cell, in particular to a block copolymer anion exchange membrane used in a fuel cell and a preparation 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) with anion-exchange membranes as polyelectrolytes have attracted much attention because of their high electrode reactivity, non-precious metal electrode catalysts, and low corrosion. research hotspots in the field. Among them, the anion exchange membrane is a key component of AEMFCs, which plays a role in conducting OH - The role of ions and blo...

Claims

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Application Information

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IPC IPC(8): C08L87/00C08J5/22C08G81/00H01M8/02H01M8/10H01M8/1027H01M8/1081
CPCY02E60/50
Inventor 刘庆林赖傲楠张秋根朱爱梅
Owner XIAMEN UNIV
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