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Branched comb polyaromatic ether sulfone as well as preparation method and application thereof

A polyarylethersulfone and comb-type technology, which is applied in the field of anion exchange membrane fuel cells, can solve problems such as no reports, and achieve the effects of easy preparation, excellent alkali stability and mechanical properties, and high performance

Inactive Publication Date: 2018-09-14
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there are no relevant reports on anion exchange membrane materials that can meet the requirements of high performance, durability and low cost in actual operation.

Method used

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  • Branched comb polyaromatic ether sulfone as well as preparation method and application thereof
  • Branched comb polyaromatic ether sulfone as well as preparation method and application thereof
  • Branched comb polyaromatic ether sulfone as well as preparation method and application thereof

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preparation example Construction

[0045] The embodiment of the present invention provides a method for preparing the branched comb-type polyarylethersulfone as described above, comprising: combining the hydroxyl-containing branched polyarylethersulfone represented by formula III with the bromoalkylimidazole represented by formula IV Onium salt is reacted to obtain the branched comb polyaryl ether sulfone shown in formula I; wherein, n is selected from an integer of 1 to 400; x is selected from an integer of 7 to 16;

[0046]

[0047] The method provided in the embodiment of the present invention prepares a high-performance branched comb-shaped polymer anion exchange membrane material, and the method is simple and easy, and the cost is low.

Embodiment 1

[0063] The synthesis of embodiment 1 imidazolium bromide

[0064] As shown in Formula B, add 80g of 1,8-dibromooctane into a three-necked flask containing a condensing reflux device and a constant-pressure dropping funnel, add 4g of 1-methylimidazole and 50mL of acetone into the constant-pressure dropping funnel, and slowly Add it dropwise into the three-necked flask and stir evenly. The reaction temperature is 40° C., and the reaction is carried out in a nitrogen atmosphere for 15 hours. When the reaction was terminated, the solution after the reaction was filtered, the filtrate was taken, and the acetone solution with a low boiling point was removed by rotary evaporation of the filtrate, then the light yellow liquid after rotary evaporation was poured into a 500mL extraction bottle, and extracted with ethyl acetate and ether solvent for 3 The second time, take the light yellow oily liquid and place it in a vacuum oven at 50° C. for drying for 24 hours to obtain the bromoalky...

Embodiment 2

[0066] According to the method of Example 1, the bromoalkylimidazolium salt shown in formula IV was prepared, wherein, x was 12, which was denoted as Br-12-Im; the yield was 73%.

[0067] In addition, according to the method of Example 1, bromoalkylimidazolium salts shown in formula IV were respectively prepared, wherein, x is 4, denoted as Br-4-Im; x is 6, denoted as Br-6-Im .

[0068] H NMR spectroscopy was used to characterize the structures of the prepared bromoalkylimidazolium salts with different chain lengths. For the results, see figure 1 . figure 1 Among them, the characteristic peaks of the corresponding hydrogen atoms on the monomer are reflected in the spectrograms, the proton peaks on the imidazole ring appear at 9.27, 7.83 and 7.85ppm, the methyl proton peaks on the imidazole ring appear at 3.86ppm, and at 1- 2ppm corresponds to the proton peak on the alkyl chain. Comparing imidazolium salt monomers with different chain lengths, it is found that the area corre...

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Abstract

The invention provides branched comb polyaromatic ether sulfone as well as a preparation method and application thereof. The branched comb polyaromatic ether sulfone has a structure shown in a formulaI, and has a branching coefficient of 2-8%; in the formula I, n is an integer selected from 1-400; R- is shown in a formula II, and x is an integer selected from 7-16. The polymer provided by the invention has a bulky rigid branching structure with the branching coefficient of 2-8%; the polymer has flexible alkyl side chains which have different lengths and are used for linking imidozalium salt groups and a polymer backbone. A branched comb polyaromatic ether sulfone membrane material provided by the invention shows a good ionic conductivity, and has excellent alkali stability and mechanicalproperties. Furthermore, the polymer is easy to prepare and lower in cost. Therefore, the branched comb polyaromatic ether sulfone can be used for the membrane material in alkaline anion exchange membrane fuel cells, and can well meet the requirements such as high performance, durability and low cost in actual operation. The formula I and the formula II are described in the description.

Description

technical field [0001] The invention relates to the technical field of anion exchange membrane fuel cells, in particular to a branched comb-type polyarylethersulfone, its preparation method and application. Background technique [0002] With the growing global demand for alternative energy sources, fuel cell technology is expected to be one of the more promising environmentally friendly power sources for transportation and stationary applications, where the only by-product is water. Among them, based on the classification of electrolytes, polyelectrolyte membrane fuel cells are mainly divided into proton exchange membrane fuel cells (PEMFC) and alkaline anion exchange membrane fuel cells (AEMFC). PEMFCs have been intensively studied in the industry over the past few decades, but durability and cost remain two major challenges hindering their global commercialization. Under these conditions, alkaline anion exchange membrane fuel cells are attracting increasing attention. ...

Claims

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Application Information

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IPC IPC(8): C08G75/23H01M8/083
CPCH01M8/083C08G75/23H01M2300/0014Y02P70/50Y02E60/50
Inventor 王雷刘东黎嘉敏
Owner SHENZHEN UNIV
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