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Long chain branch polyphenyl ether anionic membrane and preparation method thereof

An anion membrane, polyphenylene ether technology, applied in the field of long-chain branched polyphenylene ether anion exchange membrane and its preparation, can solve the problem that the benzylic quaternary ammonium group is unstable, prone to degradation, and cannot meet the long-term use of alkaline fuel cells. Requirements and other issues, to achieve the effect of improving OH-conductivity, good mobility, and improving alkali resistance and stability

Active Publication Date: 2016-12-07
DALIAN UNIV OF TECH
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Problems solved by technology

[0003] Anion exchange membranes are usually prepared from polymers containing quaternary ammonium groups. Structurally speaking, the quaternary ammonium groups contained in traditional anion exchange membranes are benzyl-type quaternary ammonium groups, such as commonly used benzyl trimethylamine quaternary ammonium groups, benzyl imidazole quaternary ammonium groups However, the benzyl-type quaternary ammonium group is unstable under alkaline conditions and is prone to degradation, which cannot meet the long-term use requirements of alkaline fuel cells

Method used

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  • Long chain branch polyphenyl ether anionic membrane and preparation method thereof
  • Long chain branch polyphenyl ether anionic membrane and preparation method thereof
  • Long chain branch polyphenyl ether anionic membrane and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0046] Preparation of acylated polyphenylene ether: under nitrogen protection, dissolve 2.4g polyphenylene ether in 70mL dichloroethane, add 1.61g aluminum trichloride, add 1.3mL p-fluorobenzoyl chloride drop by drop, at 60°C After reacting for 6 hours, add excess methanol, filter, wash with methanol, dry and reprecipitate with chloroform, and vacuum dry at 60°C to obtain acylated polyphenylene ether.

[0047] Condensation reaction: under nitrogen protection, dissolve 2 g of the acylated polyphenylene ether obtained above in 30 mL of N,N-dimethylacetamide, add 1.5 times the molar amount of p-hydroxyphenethyl alcohol, and 2.5 times the molar amount of anhydrous potassium carbonate, Then add 15mL of toluene, after azeotropic dehydration at 135°C for 4h, evaporate the dehydrating agent, then react at 150°C for 5h, add excess ethanol, wash, and dry to obtain a long-chain hydroxyl-containing polymer.

[0048] Hydroxyl bromide: Under nitrogen protection, dissolve 0.3g of a polymer c...

Embodiment 2

[0055] Preparation of acylated polyphenylene ether: under nitrogen protection, dissolve 2.4g polyphenylene ether in 70mL dichloroethane, add 1.90g aluminum trichloride, add 1.43mL p-fluorobenzoyl chloride drop by drop, at 60°C After reacting for 6 hours, add excess methanol, filter, wash with methanol, dry and reprecipitate with chloroform, and vacuum dry at 60°C to obtain acylated polyphenylene ether.

[0056] Condensation reaction: with embodiment 1

[0057] Hydroxyl bromide: with embodiment 1

[0058] Preparation of long-chain branched polyphenylene ether anion exchange membrane: same as Example 1

[0059] Tests show that the water content of the long-chain branched polyphenylene ether anion exchange membrane prepared in this example is 37%, and the ion conductivity is 18mS cm -1 , its anion exchange capacity is 1.51mmol.g -1 , the tensile strength is 16.7 MPa, which shows that the homogeneous anion exchange membrane prepared in this example has less swelling, has suitab...

Embodiment 3

[0061] Preparation of acylated polyphenylene ether: Under the protection of nitrogen, dissolve 2.4g polyphenylene ether in 70mL dichloroethane, add 2.88g aluminum trichloride, add 2.2mL p-fluorobenzoyl chloride dropwise, at 60°C After reacting for 6 hours, add excess methanol, filter, wash with methanol, dry and reprecipitate with chloroform, and vacuum dry at 60°C to obtain acylated polyphenylene ether.

[0062] Condensation reaction: with embodiment 1

[0063] Hydroxyl bromide: with embodiment 1

[0064] Preparation of long-chain branched polyphenylene ether anion exchange membrane: same as Example 1

[0065] Tests have shown that the water content of the long-chain branched polyphenylene ether anion exchange membrane prepared in this example is 50%, and the ion conductivity is 32mS cm -1 , its anion exchange capacity is 1.69mmol.g -1 , the tensile strength is 15.8 MPa, which shows that the homogeneous anion exchange membrane prepared in this example has less swelling, ha...

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Abstract

The invention discloses a method for preparing a long chain branch polyphyenyl ether anionic membrane, and belongs to the technical field of membranes. According to the membrane material, a long chain branch with a certain toughness is introduced into polyphenyl ether used as a main chain by acylation, condensation reaction and bromination and is ionized to prepare a novel alkaline anionic exchange membrane. In the preparing process, the long chain branch is introduced, so that the membrane has excellent alkali resistance, relatively high ionic conductance and excellent size stability, and can be used as an anionic exchange membrane material for alkaline fuel cells.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a long-chain branched polyphenylene ether anion exchange membrane and a preparation method thereof. Background technique [0002] Polymer electrolyte membrane fuel cell is an important new energy battery, which has the advantages of environmental protection, high specific power, high reliability, low operating temperature, and fast start-up speed. Polymer electrolyte membrane fuel cells include proton exchange membrane fuel cells and hydroxide ion exchange membrane fuel cells. Compared with proton exchange membrane fuel cells, the working environment of hydroxide ion exchange membrane fuel cells is alkaline, and the catalytic activity of the electrodes is greatly improved, so that non-noble metals can be selected as catalysts, and the catalysts are more stable, which is expected to solve the cost and stability of catalysts To realize the large-scale industrializati...

Claims

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Application Information

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IPC IPC(8): C08G65/48C08J5/22H01M8/10
CPCC08G65/485C08J5/2262C08J2371/12H01M8/1027H01M8/1072Y02E60/50
Inventor 焉晓明高莉贺高红阮雪华郑文姬潘昱
Owner DALIAN UNIV OF TECH
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