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Dicationic comb type polyarylether ion exchange membrane and preparation method thereof

A technology of ion exchange membranes and dications, which is applied in the field of ion exchange membranes containing dications comb-type polyarylether ethers and their preparation, can solve the problems of reducing the alkali resistance stability of the main chain structure, and achieve good application prospects and good alkali resistance Sexuality and mechanical strength, the effect of improving alkali resistance

Inactive Publication Date: 2021-06-25
广州费舍尔人工智能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the excellent hydrophobicity of the polymer and the excellent chemical stability of the oxadiazole ring reduce the degree of AEMs being hydrolyzed by alkali, there are still ionic groups close to the main chain of the polymer, and the benzene ring of the main chain will have a strong Electron induction effect reduces the problem of alkali resistance stability of the main chain structure

Method used

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  • Dicationic comb type polyarylether ion exchange membrane and preparation method thereof
  • Dicationic comb type polyarylether ion exchange membrane and preparation method thereof
  • Dicationic comb type polyarylether ion exchange membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Preparation of Bisphenol Monomer

[0043] In a three-necked flask equipped with a reflux condenser, a mechanical stirrer and nitrogen protection, add 55.32g (0.29mol) of 4-fluoro-2,2,2-trifluoroacetophenone, 35.18g (0.29mol) of 3,5 - Dimethylphenol, 39.77g (0.28mol) K 2 CO 3 and 300 mL of N,N-dimethylformamide (DMF). After stirring until the raw materials were completely dissolved, the temperature was raised to 110°C for 4 hours, and the orange-yellow transparent liquid gradually turned into a milky white cloudy liquid. After continuing to react for 5 hours, the milky white cloudy liquid was poured into water to settle to obtain a milky white oily product. Wash 5 times with deionized water to remove K 2 CO 3 and solvent DMF to obtain intermediate a.

[0044] In a three-necked flask equipped with a reflux condenser, a mechanical stirrer and nitrogen protection, add 23.62g (0.08mol) of intermediate a and 45.32g (0.48mol) of phenol, stir until completely dissolved, an...

Embodiment 2

[0047] Preparation of decafluorobenzoxadiazole monomer

[0048] Synthesized according to the method in the literature "Preparation and Characterization of Polyfluoropolyoxadiazole Aryl Ether Anion Exchange Membrane for Alkaline Fuel Cell" (Hu Qunhui, Master Thesis of Xiangtan University, 2012), the specific reaction process is as follows:

[0049] In a three-necked flask equipped with a reflux condenser, a mechanical stirrer and nitrogen protection, add 30.22g (0.14mol) of pentafluorobenzoic acid, 11.12g (0.08mol) of hydrazine sulfate and 200mL of polyphosphoric acid, and slowly heat to 150°C for The condensation reaction was carried out for 2 hours, and then the temperature was continued to rise to 200° C., and the cyclization reaction was carried out for 3 hours. When no obvious bubbles are observed on the liquid level, stop heating. When the reaction mixture was cooled to 70 °C, the reaction solution was poured into 800 mL of ionized water for precipitation, and the solid ...

Embodiment 3

[0051] Preparation of Brominated Polyoxadiazole Aryl Ether Derivatives (PAEO-DMX)

[0052] Add decafluorobenzoxadiazole, bisphenol monomer, biphenol and K 2 CO 3 , and add a mixed solvent of N,N-dimethylacetamide and toluene (V / V=2 / 1), fully stir and dissolve, then raise the temperature to 80°C for polycondensation reaction, and pour it into methanol to precipitate flocculent The polymer was washed 3 times and dried in vacuum to obtain PAEO-DM.

[0053] In a three-necked flask equipped with a reflux condenser, a mechanical stirrer, and a nitrogen atmosphere protection, add PAEO-DM and dichloroethane respectively, raise the temperature to 60°C and stir to dissolve the polymer completely, cool to room temperature, and pour into the three-necked flask Add BPO and NBS respectively, raise the temperature to 80°C and react for 5h, pour the reaction solution into ethanol and settle to obtain a white floc, wash with ethanol for 5 times and dry in a vacuum oven at 100°C for 12h to ob...

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Abstract

The invention discloses a dicationic comb type polyarylether ion exchange membrane and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a bisphenol monomer; (2) carrying out polycondensation on decafluorobenzene oxadiazole, a bisphenol monomer and biphenol as monomers to prepare a derivative of polyoxadiazole arylether, and carrying out bromination and quaternization reaction to prepare the dicationic comb type polyarylether ion exchange membrane; the side group quaternary ammonium salt of the AEMs is separated from a main chain by phenoxy, so that the hydrolysis of OH <-> on the main chain can be reduced, and the alkali resistance of the AEMs is improved; in addition, due to the side group structure of the dication structure, the IEC of the membrane is improved, quaternary ammonium salt can be self-assembled into an effective ion channel, the advantages of long side chain type and dense functional anion exchange membranes are combined, and the ion exchange membrane has a good potential application prospect.

Description

technical field [0001] The invention belongs to the technical field of fuel cell materials, and in particular relates to a comb-type polyarylether ion exchange membrane containing double cations and a preparation method thereof. Background technique [0002] Anion-exchange membranes (AEMs) are an important part of alkaline fuel cells. Conductivity and alkali resistance are two major indicators for evaluating their performance, and their performance consists of two indicators. Under alkaline working conditions, the ionic groups and main chain structure of AEMs are easily degraded and damaged, so a polymer backbone with high strength and rigidity is required to maintain the thermal and chemical stability of the material. In addition, building efficient ion transport channels is an important way to improve the conductivity of membrane materials. On the one hand, it can improve the ion exchange capacity (IEC) of AEMs, and on the other hand, it can regulate the microphase topolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L71/10C08G65/40C08J5/22H01M8/1018H01M8/1072H01M8/1086
CPCC08G65/4006C08G65/4093C08J5/2262C08J2371/10H01M8/1018H01M8/1072H01M8/1086Y02E60/50
Inventor 陈金泉
Owner 广州费舍尔人工智能技术有限公司
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