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Modified graphene and preparation method thereof

A graphene and graphene surface technology, applied in the field of modified graphene and its preparation, can solve problems such as affecting the physical properties of graphene, and achieve the effects of good independent film-forming performance, good electrical conductivity and good dispersibility

Active Publication Date: 2015-03-11
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the invention provides a modified graphene and a preparation method thereof, the purpose of which is to modify the polymer material on the surface of the graphene through the effect of non-covalent bonds, so that it has good Dispersion and surface regularity, thus solving the technical problem that covalent bond coating affects the physical properties of graphene

Method used

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  • Modified graphene and preparation method thereof

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preparation example Construction

[0049] Modified graphene provided by the invention, its preparation method, comprises the following steps:

[0050] (1) Add aromatic compounds, imidazole compounds and 4-dimethylaminopyridine into dichloromethane so that the molar ratio of aromatic compounds to imidazole compounds is between 1:2 and 2:1, and the aroma The molar ratio of the group compound and 4-dimethylaminopyridine is between 1000:1 and 5:1, and they are uniformly mixed to prepare a mixed solution A.

[0051] The aromatic compound is one of β-naphthyloxyacetic acid, 9-anthracenecarboxylic acid, 1-pyrenecarboxylic acid, 1-pyrenebutyric acid, and 4-oxo-4-pyrene-1-ylbutyric acid; the described Imidazole compounds are α-(2,4-dichlorophenyl)-1H-imidazole-1-ethanol, 4-(1-imidazolyl)benzyl alcohol, 1-(2-hydroxyethyl)imidazole, 1-( One of the hydroxymethyl) imidazoles.

[0052] (2) Add dropwise dicyclohexylcarbodiimide solution to the mixed solution A, and react at 0-40° C. under the protection of an inert gas for ...

Embodiment 1

[0063] A modified graphene comprises graphene and a long-chain aromatic compound, the long-chain aromatic compound is modified on the surface of the graphene through non-covalent bond interaction, and the coating density is 0.7. The long-chain aromatic compound is a long-chain macromolecule with an aromatic group at the end, and the relative molecular mass of the long chain is 5540. The aromatic group is R 2 It is a long-chain group of brominated polyethylene glycol monomethyl ether. The non-covalent interaction is π-π conjugation.

[0064] The structure of the long-chain aromatic compound is shown in Table 1

[0065] The modified graphene prepared in this embodiment: the electron micrograph is shown in Figure 1.

[0066] Described modified graphene is prepared according to the following method:

[0067] (1) Add 4-oxo-4-pyrene-1-ylbutanoic acid, α-(2,4-dichlorophenyl)-1H-imidazole-1-ethanol and 4-dimethylaminopyridine to di In methyl chloride, the molar ratio of 4-oxo-4...

Embodiment 2

[0075] A modified graphene comprises graphene and a long-chain aromatic compound, the long-chain aromatic compound is modified on the surface of the graphene through non-covalent bond interaction, and the coating density is 1.5. The long-chain aromatic compound is a long-chain macromolecule with an aromatic group at the end, and the relative molecular mass of the long chain is 2437. The aromatic group is R 2 It is a long-chain group of brominated polyethylene glycol monomethyl ether. The non-covalent interaction is π-π conjugation.

[0076] The structure of the long-chain aromatic compound is shown in Table 1

[0077] The modified graphene prepared in this embodiment: the dispersion effect in different solvents is as follows: figure 2 shown.

[0078] Described modified graphene is prepared according to the following method:

[0079] (1) β-naphthyloxyacetic acid, 4-(1-imidazolyl) benzyl alcohol and -dimethylaminopyridine are added in dichloromethane, so that β-naphthylox...

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Abstract

The invention discloses modified graphene with a good dispersion property, and a method for preparing the modified graphene. Through non-covalent bond effect, a high-molecular material is modified on the surface of graphene, such that graphene is provided with the good dispersion property. A specific preparation method of the modified graphene comprises the following steps: an imidazole compound is grafted on aromatic small molecule; imidazole initiates epoxy ring-opening polymerization or is directly subjected to a reaction with a long-chain high molecule with a halogen group on the end, such that a long-chain aromatic compound with an aromatic group on the end is obtained; in a reductive solvent with dispersed graphene oxide, graphene oxide is subjected to one-step reduction, and at the same time the long-chain aromatic compound with the aromatic group on the end is modified to the surface of graphene with a non-covalent bond manner. The method provided by the invention has the following advantage: the one-step method is used, such that the graphene surface regularity can be well maintained, and a large amount of modified graphene can be obtained in one step with a simple method.

Description

technical field [0001] The invention belongs to the field of polymer functional materials, and more specifically relates to a modified graphene and a preparation method thereof. Background technique [0002] Graphene is a two-dimensional material composed of carbon atoms. Due to the particularity of its two-dimensional structure, it has the advantages of light weight and large specific surface area. In addition, due to its excellent electrical properties, thermal properties and mechanical strength, as well as some unique properties, such as quantum Hall and quantum tunneling effects, it has become a very promising nanomaterial at present. However, there are no functional groups on the surface of graphene, and the strong interaction between sheets makes it easy to stack. When multiple sheets of graphene are put together, it is easy to form a multilayer graphene structure. This stacked graphene structure not only has poor stability, but also reduces the specific surface area ...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 叶昀昇王皓解孝林周兴平吕淑君
Owner HUAZHONG UNIV OF SCI & TECH
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