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Ionic liquid polymer grafted magnetic carbon nanotube and preparation method thereof

A technology of magnetic carbon nanotubes and polymerized ionic liquids, which is applied in the field of surface modification of carbon nanotubes, can solve the problems of non-dispersion of carbon nanotubes, limitations on the use of carbon nanotubes, etc., and achieves the effects of easy operation and strong stability

Inactive Publication Date: 2015-09-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Untreated carbon nanotubes are hardly dispersed in any organic solvents, which greatly limits the use of carbon nanotubes

Method used

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  • Ionic liquid polymer grafted magnetic carbon nanotube and preparation method thereof
  • Ionic liquid polymer grafted magnetic carbon nanotube and preparation method thereof
  • Ionic liquid polymer grafted magnetic carbon nanotube and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Ethyl bromide (3.70g, 34mmol) was added dropwise to 1-vinylimidazole (1.88g, 20mmol), refluxed at 50°C for 16h, cooled to room temperature, filtered, washed with sufficient ethyl acetate, and dried under vacuum at 50°C to obtain Pale yellow solid powder 1-ethyl-3-vinylimidazolium bromide, yield 81%.

[0042] Put the mixed acid solution of 4g of original carbon nanotubes, concentrated sulfuric acid (98%, 120mL) and concentrated nitric acid (68%, 40mL) in a 250mL glass beaker, mix and sonicate for 8h, after cooling to room temperature, pour the reaction mixture into 800mL Stand overnight in deionized water, and after the carbon nanotubes settle down, pour out the upper layer solution, repeat this operation three times, wash with 0.22 μm polycarbonate membrane until neutral, and dry at 60°C for 12 hours in vacuum to obtain acidified carbon nanotubes. Tube.

[0043] At a temperature of 65° C., 3 g of acidified carbon nanotubes were added to 80 mL of thionyl chloride to rea...

Embodiment 2

[0050] Bromobutane (4.66g, 34mmol) was added dropwise to 1-vinylimidazole (1.88g, 20mmol), refluxed at 50°C for 16h, cooled to room temperature, filtered, washed with enough ethyl acetate, vacuumed at 50°C Dry to give 1-butyl-3-vinylimidazolium bromide.

[0051] Put the mixed acid solution of 4g of original carbon nanotubes, concentrated sulfuric acid (98%, 120mL) and concentrated nitric acid (68%, 40mL) in a 250mL glass beaker, mix and sonicate for 8h, after cooling to room temperature, pour the reaction mixture into 800mL Stand in deionized water overnight, after the carbon nanotubes settle down, pour out the upper layer solution, repeat this operation three times, wash with 0.22 μm polycarbonate membrane until neutral, and dry in vacuum at 60°C for 12 hours. At a temperature of 65° C., 3 g of acidified carbon nanotubes were added to 80 mL of thionyl chloride to react for 24 hours. After the reaction, the mixture was filtered, washed with dry tetrahydrofuran, and dried at ro...

Embodiment 3

[0056] Bromo-n-hexane (5.16g, 34mmol) was added dropwise to 1-vinylimidazole (1.88g, 20mmol), refluxed at 50°C for 16h, cooled to room temperature, filtered, washed with enough ethyl acetate, and dried under vacuum at 50°C In 1-hexyl-3-vinylimidazolium bromide.

[0057] Put the mixed acid solution of 4g of original carbon nanotubes, concentrated sulfuric acid (98%, 120mL) and concentrated nitric acid (68%, 40mL) in a 250mL glass beaker, mix and sonicate for 8h, after cooling to room temperature, pour the reaction mixture into 800mL Stand in deionized water overnight, after the carbon nanotubes settle down, pour out the upper layer solution, repeat this operation three times, wash with 0.22 μm polycarbonate membrane until neutral, and dry in vacuum at 60°C for 12 hours. At a temperature of 65° C., 3 g of acidified carbon nanotubes were added to 80 mL of thionyl chloride to react for 24 hours. After the reaction, the mixture was filtered, washed with dry tetrahydrofuran, and dri...

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Abstract

The invention discloses a preparation method of an ionic liquid polymer grafted magnetic carbon nanotube. The method comprises the following steps: reacting halogenated hydrocarbon with 1-vinyl imidazole to synthesize an ionic liquid for later use, carrying out acidifying oxidation treatment on an original carbon nanotube by using concentrated sulfuric acid and concentrated nitric acid, and reacting the obtained carbon nanotube with thionyl chloride and ethylene glycol to obtain a hydroxylated carbon nanotube; loading an initiator bromoisobutyryl bromide to the surface of the hydroxylated carbon nanotube, and initiating polymerization of the ionic liquid on the surface of the carbon nanotube; and carrying out one-step simple ion exchange to introduce magnetic anions in order to synthesize the novel magnetic carbon nanotube. The magnetic carbon nanotube prepared in the invention has nanometer dimension and strong magnetism, and can be rapidly separated and enriched through simple magnetic field action.

Description

technical field [0001] The invention relates to a method for modifying the surface of carbon nanotubes, in particular to a method for grafting and polymerizing ionic liquids on the surface of carbon nanotubes, and belongs to the field of nanotechnology. Background technique [0002] In recent years, carbon nanotubes have attracted widespread attention due to their excellent mechanical properties and unique mechanical and electrical properties. The performance of multi-walled carbon nanotubes is equivalent to that of single-walled carbon nanotubes, but multi-walled carbon nanotubes are cheaper and easier to obtain, and have become a research hotspot. [0003] Untreated carbon nanotubes are hardly dispersed in any organic solvents, which greatly limits the use of carbon nanotubes. People try to overcome this shortcoming of carbon nanotubes by grafting polymers on the surface of carbon nanotubes by covalent and non-covalent methods. Among them, the method of covalently grafti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F226/06C08F8/44
Inventor 高艳安刘静王畅
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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