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Polyfluorene-based side-chain anion exchange membrane and preparation method thereof

An anion exchange membrane and side chain technology, applied in the field of polyfluorene-based side chain type anion exchange membrane and its preparation, to achieve the effects of enhancing flexibility, improving flexibility and solubility, and reducing inductive effects

Pending Publication Date: 2021-12-10
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Further research found that if the polymer main chain contains weak bonds such as ether bonds, it will also be attacked by OH-, resulting in polymer degradation.

Method used

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  • Polyfluorene-based side-chain anion exchange membrane and preparation method thereof
  • Polyfluorene-based side-chain anion exchange membrane and preparation method thereof
  • Polyfluorene-based side-chain anion exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 2,7-dibromofluorene (5.0g, 15mmol), 1,6-dibromohexane (30ml) and tetrabutylammonium bromide (0.1g) were dissolved in tetrahydrofuran with stirring at 60°C. Under nitrogen protection, NaOH solution (30ml, 50wt%) was added slowly. The mixture was reacted for 8 hours. Then the reaction solution was extracted with dichloromethane, and the dried organic layer was collected. The crude product was separated and purified by column chromatography with n-hexane to obtain 9,9-dibromohexyl-2,7-dibromofluorene with a yield of 82%.

[0030] 9,9-dibromohexyl-2,7-dibromofluorene, bis(pinacol and) diboron (3.0 g, 12 mmol), potassium acetate (3.5 g, 35.5 mmol) and (PdCl 2 )(dppf) (250mg) was dissolved in 50ml of toluene. Under the protection of nitrogen, the reaction was stirred at 85° C. for 24 hours. The reaction solution was extracted with dichloromethane and water, and the dried organic layer was collected. The crude product was separated and purified by column chromatography wi...

Embodiment 2

[0036] This example is similar to Example 1, except that 1,4-dibromobutane is used to substitute and graft the 9th position of fluorene, and the structure of the finally prepared polyfluorene-based side chain anion exchange membrane is:

[0037]

[0038] The prepared polyfluorene-based side-chain anion exchange membrane has an ion conductivity of 70.24 mScm at 80 °C -1 , The degree of swelling at 80°C is only 8.48%. When the film was soaked in 2M KOH solution at 80 °C for 30 days, the conductivity lost only 8%, showing excellent alkali resistance stability.

Embodiment 3

[0040] This example is similar to Example 1, except that in the final quaternization process, 1,2-dimethylimidazole is selected, and the structure of the finally prepared polyfluorene-based side chain anion exchange membrane is:

[0041]

[0042] The prepared polyfluorene-based side-chain anion exchange membrane has an ion conductivity of 78.24 mScm at 80 °C -1 , The degree of swelling at 80°C is only 7.18%. When the film was soaked in 2M KOH solution at 80 °C for 30 days, the conductivity lost only 8%, showing excellent alkali resistance stability.

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Abstract

The invention relates to a polymer anion exchange membrane and a preparation method thereof, in particular to a polyfluorene-based side-chain anion exchange membrane and a preparation method thereof. According to the invention, a series of weak-bond-free polyfluorene high polymer materials are synthesized through Suzuki coupling reaction to serve as a main chain framework of AEMs, in order to maintain the strength of AEMs, a stable alkyl chain segment is introduced into the polyfluorene main chain, the chain flexibility and solubility of polyfluorene are adjusted, the distance between quaternary ammonium cations and aromatic rings on the main chain is adjusted, the polarization effect of the cations on the main chain is reduced, and the alkali resistance of AEMs is improved; the polyfluorene-based polymer is prepared, and a microphase separation structure is constructed to improve the ionic conductivity of a polymer film; and the whole preparation process is simple and efficient.

Description

technical field [0001] The invention relates to a polymer anion exchange membrane and a preparation method thereof, in particular to a side chain type anion exchange membrane based on polyfluorene and a preparation method thereof. Background technique [0002] In recent years, environmental pollution and energy shortages have become increasingly serious. As an efficient and clean new energy conversion device, fuel cells have attracted widespread attention. There are many types of fuel cells, among which the polymer electrolyte membrane fuel cell replaces the electrolyte with a solid electrolyte membrane, which has higher power density and stronger CO 2 Tolerance has become a research hotspot in the past decade. Polymer electrolyte membrane fuel cells can generally be divided into proton exchange membrane fuel cells (PEMFCs) and alkaline anion exchange membrane fuel cells (AEMFCs) according to the different electrolyte membranes used. compared to PEMFCs. AEMFCs have faste...

Claims

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Application Information

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IPC IPC(8): C08G61/02C08J5/22C08L65/00
CPCC08G61/02C08J5/2256C08G2261/124C08G2261/1412C08G2261/146C08G2261/312C08G2261/3142C08G2261/3326C08G2261/3424C08G2261/411C08G2261/72C08J2365/00
Inventor 丁建宁徐斐林本才李泾陈燕波袁宁一
Owner CHANGZHOU UNIV
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