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Method for preparing temperature-sensitive graphene/polymer hybrid material

A hybrid material, graphene technology, applied in the field of materials, can solve the problems of graphene research and application difficulties, weak interaction, insoluble in water, etc., to achieve the effects of easy control, improved solubility, and broadened development and application.

Inactive Publication Date: 2013-07-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since graphene with a complete structure is a two-dimensional crystal composed of benzene six-membered rings without any unstable bonds, its chemical stability is very high, its surface is in an inert state, and its interaction with other media is weak.
Moreover, there is a strong van der Waals force between graphene sheets, which is prone to aggregation, making it difficult to dissolve in water and common organic solvents, which has caused great difficulties for the further research and application of graphene.

Method used

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  • Method for preparing temperature-sensitive graphene/polymer hybrid material
  • Method for preparing temperature-sensitive graphene/polymer hybrid material
  • Method for preparing temperature-sensitive graphene/polymer hybrid material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mix 1g of graphene oxide and 30ml of N-N-dimethylformamide in a flask evenly, add 30ml of dibromoisobutyryl bromide and 20ml of triethylamine into the flask containing the mixture, and react in an ice bath After 24 hours, wash with a large amount of chloroform and distilled water after filtering, and dry in a vacuum oven to obtain dried brominated graphene oxide.

[0025] Take 0.1g of brominated graphene oxide, dissolve it in a flask with 5ml of N-N-dimethylformamide equipped with a magnet, and then add 4g of methacrylic acid-N, N-dimethylformamide to the flask in turn Ethyl ester, 15mg of cuprous bromide, 70μL of bipyridine, the system was reacted at 60°C for 24 hours under the protection of nitrogen, the product was diluted with tetrahydrofuran and centrifuged with a centrifuge, repeated centrifugation, and placed in a vacuum oven After drying, the hybrid material of graphene oxide / poly(N,N-dimethylethyl methacrylate) was obtained.

[0026] Take 40mg of graphene oxid...

Embodiment 2

[0030] Mix 1g of graphene oxide and 25ml of N,N-dimethylacetamide in a flask, add 25ml of dibromoisobutyryl bromide and 15ml of triethylamine into the flask containing the mixture, and place in an ice bath React in 20 hours, wash with a large amount of chloroform and distilled water after filtering, put into vacuum oven after drying, obtain the brominated graphene oxide of drying.

[0031] Take 0.1g of brominated graphene oxide and dissolve it in a flask containing 4ml of N, N-dimethylacetamide equipped with a magnet, and then add 6g of methacrylic acid-N, N-dimethacrylate to the flask in turn. Methyl ethyl ester, 25 mg of cuprous bromide, 90 μL of hexamethyltriethylenetetramine, the system was reacted at 80 °C for 30 hours under the protection of nitrogen, and the product was diluted with tetrahydrofuran and then centrifuged in a centrifuge. Repeated centrifugation and drying in a vacuum oven to obtain a graphene oxide / poly(N,N-dimethylethyl methacrylate) hybrid material.

...

Embodiment 3

[0034] Mix 1g of graphene oxide and 40ml of N,N-diethylformamide in a flask, add 40ml of dibromoisobutyryl bromide and 25ml of triethylamine into the flask containing the mixture, and place in an ice bath Reacted in medium for 30 hours, washed with a large amount of chloroform and distilled water after filtration, and dried in a vacuum oven to obtain dry brominated graphene oxide.

[0035] Take 0.15g of brominated graphene oxide, dissolve it in a flask with 8ml of N-N-diethylformamide equipped with a magnet, and then add 5g of methacrylic acid-N, N-dimethyl Ethyl ester, 15 mg of cuprous chloride, 70 μL of bipyridine, the system was reacted at 70 ° C for 20 hours under the protection of nitrogen, the product was diluted with tetrahydrofuran and then centrifuged with a centrifuge, and the centrifugation was repeated several times to remove the catalyst and untreated Impurities such as monomers of the reactant are centrifuged and dried in a vacuum oven to obtain a hybrid material...

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Abstract

The invention relates to a method for preparing temperature-sensitive graphene / polymer hybrid material. The preparation method comprises the steps of reacting by hydroxyl and halogenated substances at the surface of oxidized graphene, converting hydroxyl into halogen atoms, taking the halogen atoms as a macroinitiator, polymerizing atom transfer radical of methacrylic acid-N,N-dimethylamino ethyl monomer to form an oxidized graphene / polymer hybrid material under the protection of an inert gas nitrogen or argon; and then carrying out quaternization on the polymer grafted at the surface of the oxidized graphene, so that the polymer has the property of converting into the highest critical solution temperature from the lowest critical solution temperature. The graphene / polymer hybrid material prepared by the method not only greatly improves the solubility of the graphene, but also has thermo-sensibility, and achieves transformation from the lowest critical solution temperature to the highest critical solution temperature by quaternization of the polymer. The method disclosed by the invention is simple and convenient to operate and easy to control, and expands the development and application of the graphene.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a method for preparing a temperature-sensitive graphene / polymer hybrid material. Background technique [0002] Graphene is a new type of material discovered by British scientist Geim in 2004. It is a two-dimensional hexagonal close-packed sheet structure with single atoms connected by sp2 hybridization of carbon atoms. Its structural unit is the most stable among organic materials. The six-membered ring is currently the most ideal two-dimensional nanomaterial. [0003] Graphene has excellent mechanical and electrical properties, and it has great potential application value in many fields. However, since graphene with a complete structure is a two-dimensional crystal composed of six-membered benzene rings without any unstable bonds, its chemical stability is very high, its surface is in an inert state, and its interaction with other media is weak. Moreover, there is a strong...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F220/34C08F8/44
Inventor 袁伟忠王金菊沈天翔
Owner TONGJI UNIV
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