A kind of preparation method of semi-flexible polyethersulfone/ketone anion exchange membrane

An anion exchange membrane and polyethersulfone technology, applied in electrical components, circuits, battery electrodes, etc., can solve the problems of inability to form ion channels, low ion conductivity, poor mechanical strength, etc., and achieve cheap and abundant raw materials and high ion conductivity The effect of simple steps and simple steps

Active Publication Date: 2017-12-05
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Synthesized polyethersulfone containing tetraphenylmethane in the repeating unit, which increased the local concentration of ionic groups, but due to the strong rigidity of the chain, it was not conducive to the movement of the chain, and could not form a good ion channel, resulting in its ion conduction The rate is still low (room temperature 25mS / cm, theoretical IEC is 2.56mequiv g -1 )
At the same time, this film has a large degree of water swelling, which leads to poor mechanical strength

Method used

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  • A kind of preparation method of semi-flexible polyethersulfone/ketone anion exchange membrane
  • A kind of preparation method of semi-flexible polyethersulfone/ketone anion exchange membrane
  • A kind of preparation method of semi-flexible polyethersulfone/ketone anion exchange membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Preparation of 4C-PES polymer: Dissolve 0.05 mol of 1,4 dibromobutane and 0.5 mol of hydroquinone in 95% ethanol, heat to reflux, add 0.15 mol of KOH ethanol solution dropwise, react for 5 hours, and synthesize 4C flexible diphenol monomer, recrystallized to obtain pure material. In a three-neck flask equipped with a nitrogen inlet and outlet device and a Dean-Stark separator, add 2.5425g of 4,4-difluorodiphenylsulfone (10mmol), 2.7432g of 4C flexible diphenol monomer (10mmol), 30mL of DMSO, 2.7624 g of potassium carbonate (20 mmol) and 15 mL of toluene. Gradually raise the temperature to 140°C and reflux for 5 hours until the water is completely removed in the form of toluene / water azeotrope, then the temperature rises slowly to 165°C, and the temperature is kept constant for 15 hours. The reaction was complete and cooled to room temperature. The product was slowly poured into ice water, and a white fibrous polymer product was precipitated. Wash and soak the product...

Embodiment 2

[0032] Preparation of 6C-PES polymer:

[0033] Similar to the preparation method of 4C-PES in Example 1, the difference is that -CH 2 The number of - is 6. Dissolve 0.05 mol of 1,6-dibromohexane and 0.5 mol of hydroquinone in 95% ethanol, heat to reflux, drop 0.15 mol of KOH in ethanol solution, and react for 5 hours to synthesize 6C flexible diphenol mono body, recrystallized to obtain pure monomer. In a three-necked flask equipped with a nitrogen inlet and outlet device and a Dean-Stark separator, 2.5425g of 4,4-difluorodiphenylsulfone (10mmol), 3.0232g of 6C diphenol monomer (10mmol), 30mL of DMSO, 2. 7624 g of potassium carbonate (20 mmol) and 15 mL of toluene. Gradually raise the temperature to 140°C and reflux for 5 hours until the water is completely removed in the form of toluene / water azeotrope, then the temperature rises slowly to 165°C, and the temperature is kept constant for 15 hours. The reaction was complete and cooled to room temperature. The product was s...

Embodiment 3

[0035] Preparation of 8C-PES polymer:

[0036] Similar to the preparation method of 4C-PES in Example 1, the difference is that -CH 2 The number of - is 8. Dissolve 0.05 mol of 1,8-dibromooctane and 0.5 mol of hydroquinone in 95% ethanol, heat to reflux, add 0.15 mol of KOH in ethanol solution dropwise, and react for 5 hours to synthesize 8C flexible diphenol mono body, recrystallized to obtain pure monomer. In a three-neck flask equipped with a nitrogen inlet and outlet device and a Dean-Stark separator, 2.5425g of 4,4-difluorodiphenylsulfone (10mmol), 3.3232g of 8C diphenol monomer (10mmol), 30mL of DMSO, 2. 7624 g of potassium carbonate (20 mmol) and 15 mL of toluene. Gradually raise the temperature to 140°C and reflux for 5h until the water is completely removed in the form of toluene / water azeotrope, then the temperature rises slowly to 165°C, and the temperature is kept constant for 18h. The reaction was complete and cooled to room temperature. The product was slowl...

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Abstract

The invention discloses a preparation method of a semi-flexible polyether sulfone / ketone anion-exchange membrane, and particularly provides a preparation method of a high-conductivity anion-exchange membrane of a fuel cell. The membrane material contains flexible aliphatic chains with different lengths in repetitive units. The preparation method comprises steps as follows: 1), polymer synthesis; 2), polymer halomethylation; 3), preparation of the semi-flexible polyether sulfone / ketone anion-exchange membrane. Due to the fact that the aliphatic chains are introduced into a main polymer chain, the flexibility of the main chain is further improved, the main chain acquires higher mobility, hydrophilic and hydrophobic microphase separation is enhanced, a better ion channel is formed accordingly, and membrane swelling is reduced. The preparation technology is simple, the cost is low, and the prepared anion-exchange membrane has high conductivity and good stability and is applicable to an alkaline fuel cell.

Description

technical field [0001] The invention relates to a preparation method of a semi-flexible polyethersulfone / ketone anion exchange membrane, in particular to a preparation method of a fuel cell high conductivity anion exchange membrane. Background technique [0002] Due to the current environmental and energy problems, the development of green energy with low environmental pollution and high energy conversion rate has become one of the urgent problems for human beings to solve. Due to its high conversion efficiency and clean characteristics, fuel cells have become a research hotspot in the field of new energy. As one of the most important components of the battery, the ion exchange membrane should have good ion conductivity and mechanical stability. Polyarylethersulfone (ketone) has become a good membrane material due to its excellent mechanical properties, corrosion resistance and thermal stability, and has attracted extensive attention in the field of fuel cell applications. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G75/23C08J5/18H01M4/88H01M4/94
CPCC08G75/23C08J5/18C08J2381/06H01M4/8875H01M4/94Y02E60/50
Inventor 焉晓明赵宝林贺高红郑文姬阮雪华代岩潘昱
Owner DALIAN UNIV OF TECH
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