Main chain type alkaline anion exchange membrane based on ether-bond-free polyfluorene and preparation method thereof

An anion exchange membrane and basic anion technology, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of few application reports in the field of fuel cells, achieve excellent chemical stability, increase molecular weight, and improve ion conductivity Effect

Pending Publication Date: 2021-11-30
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the PF structure is currently more used in the field of organic optoelectronics, and there are fewer reports on the application in the field of fuel cells.

Method used

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  • Main chain type alkaline anion exchange membrane based on ether-bond-free polyfluorene and preparation method thereof
  • Main chain type alkaline anion exchange membrane based on ether-bond-free polyfluorene and preparation method thereof
  • Main chain type alkaline anion exchange membrane based on ether-bond-free polyfluorene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Dissolve 9,9-dihexyl-2,7-dibromofluorene (1.72g, 3.5mmol) in 35ml of toluene, add 35ml of 1M Na 2 CO 3 aqueous solution. The mixture was heated to 100°C, and phenylboronic acid (1.28 g, 10.5 mmol) and Pd (pph 3 ) 4 (4.2mg, 0.1mmol), stirred for 36 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 using a mixture of n-hexane and dichloromethane with volume gradient changes to obtain 9,9-dihexyl-2,7-diphenylfluorene with a yield of ~95%.

[0028] (2) Dissolve 9,9-dihexyl-2,7-diphenylfluorene (2.2g, 4.5mmol) and N-methyl-4-piperidone (0.56g, 4.95mmol) in 9ml of dichloromethane middle. Add 0.5ml of trifluoroacetic acid and 6ml of trifluoromethanesulfonic acid successively under ice-water bath. The mixture was mechanically stirred at room temperature for 48 hours, and the mixture became highly viscous. Na 2 CO 3 The aqueous s...

Embodiment 2

[0032] This example is similar to Example 1, except that n-butane is modified at the 9th position of fluorene, and its chemical structure is shown in the figure:

[0033] The prepared anion exchange membrane has an ion conductivity of 70.11mS cm at 80°C -1 , The degree of swelling at 80°C is only 6.1%. The tensile strength is 21.2MPa. When the film was soaked in 2M KOH solution at 80°C for 30 days, the conductivity lost only 12.42%.

Embodiment 3

[0035] This example is similar to Example 1, except that methane is modified at the 9th position of fluorene, and its chemical structural formula is shown in the figure:

[0036] The prepared anion exchange membrane has an ion conductivity of 66.68mS cm at 80°C -1 , The degree of swelling at 80°C is only 5.7%. The tensile strength is 20.2 MPa. When the film was soaked in 2M KOH solution at 80°C for 30 days, the conductivity lost only 14.48%.

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Abstract

The invention relates to a polymer anion exchange membrane and a preparation method thereof, in particular to a main chain type alkaline anion exchange membrane based on ether-bond-free polyfluorene and a preparation method thereof. According to the invention, piperidine cations with excellent alkali-resistant stability are selected, and methylene side chain substituted fluorenyl monomers with different sizes at the ninth site are designed and synthesized. The fluorenyl polymer without containing ether bonds is prepared through acid-catalyzed Friedel-Crafts polymerization, so that the chemical stability of the anionic membrane is improved. The whole preparation process is simple and efficient. A methylene side chain is introduced into a hydrophobic segment of a polymer main chain, formation of micro-phase separation in the membrane is promoted, and a high-speed channel is provided for ion transmission, so that the conductivity of the membrane is further improved.

Description

technical field [0001] The invention relates to a polymer anion exchange membrane and a preparation method thereof, in particular to a main chain type basic anion exchange membrane based on polyfluorene without ether bonds and a preparation method thereof. Background technique [0002] As a new type of energy conversion device, fuel cells have attracted widespread attention in recent years due to their advantages of high efficiency and cleanliness. There are many types of fuel cells, among which polymer electrolyte membrane fuel cells have become a current research hotspot because of their higher output power and solving the problem of electrolyte leakage in traditional fuel cells. Polymer fuel cells can generally be divided into proton exchange membrane fuel cells and anion exchange membrane fuel cells according to the different electrolyte membranes used. Compared with proton exchange membrane fuel cells, anion exchange membrane fuel cell (AEMFC) technology has the follow...

Claims

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Application Information

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IPC IPC(8): C08G61/12C08J5/22B01D71/72B01D69/02B01D67/00B01D61/42H01M8/103C08L65/00
CPCC08G61/122C08J5/2256C08J5/2287B01D71/72B01D69/02B01D67/0002B01D61/422H01M8/103C08G2261/124C08G2261/1412C08G2261/3142C08G2261/312C08G2261/334C08G2261/72C08G2261/516C08G2261/592C08G2261/59C08G2261/62C08J2365/00B01D2325/42Y02E60/50
Inventor 林本才徐斐丁建宁陈燕波李泾
Owner CHANGZHOU UNIV
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