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Functional graphene oxide for adjusting and controlling dispersibility of solvent by using organic chain segment as well as preparation method thereof

A solvent-dispersed and functionalized technology, applied in the field of surface modification and modification of graphene oxide, can solve problems such as loss of dispersing ability, and achieve the effects of saving energy, speeding up the reaction, good application prospects and economic benefits

Inactive Publication Date: 2011-01-05
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the dispersibility of graphene oxide modified by the above method in organic solvents has been improved, it has lost its dispersibility in water.

Method used

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  • Functional graphene oxide for adjusting and controlling dispersibility of solvent by using organic chain segment as well as preparation method thereof
  • Functional graphene oxide for adjusting and controlling dispersibility of solvent by using organic chain segment as well as preparation method thereof
  • Functional graphene oxide for adjusting and controlling dispersibility of solvent by using organic chain segment as well as preparation method thereof

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preparation example Construction

[0030] combine figure 2 , the present invention utilizes organic segment to regulate the preparation method of the functionalized graphene oxide of solvent dispersion performance, and the steps are as follows:

[0031] In the first step, the graphite oxide prepared by the Hummers method is dispersed in N,N-dimethylformamide (DMF) to form a uniform dispersion;

[0032] In the second step, the thionyl chloride reagent is added to the product obtained in the first step, and the reflux reaction is synthesized to synthesize the graphite oxide intermediate product activated by acid chloride;

[0033] The 3rd step, the mixed solution of the second step of underpressure distillation, removes unnecessary thionyl chloride;

[0034] The fourth step is to add pyridine to the product of the third step. After grafting organic molecules or polymer molecules, heat and stir the mixture, and add a certain amount of pyridine as a catalyst and acid-binding agent to speed up the reaction. The am...

Embodiment 1

[0038] Embodiment 1: The present invention synthesizes the graphene oxide of organic molecule modification, comprises the following steps:

[0039] The first step is the preparation of graphite oxide.

[0040] Pre-oxidation of graphite:

[0041] Heat 30mL of concentrated sulfuric acid to 80°C, add 10g K2S2O8 and 10g P2O5, and then slowly add 20g graphite. A dark blue mixture was obtained. After the addition was complete, the mixture was allowed to cool naturally to room temperature over 6 hours. After carefully adding distilled water, filter and wash with plenty of water. until the pH of the filtrate is neutral. The filter cake was dried overnight at room temperature.

[0042] Graphite oxide prepared by Hummer's method:

[0043] Cool 460mL of concentrated sulfuric acid to about 0°C, then add 20g of pre-oxidized graphite into it, and then slowly add 60g of potassium permanganate so that the temperature of the system does not exceed 20°C, after the addition is completed, r...

Embodiment 2

[0049] Embodiment 2: The present invention synthesizes the graphene oxide of organic molecule modification, comprises the following steps:

[0050] The first step is the same as step 1 in Example 1;

[0051] In the second step, 200 mg of graphite oxide was added to 7.5 mL of DMF solvent, and ultrasonically dispersed until a uniform mixture was obtained;

[0052] In the third step, add 40 mL of thionyl chloride to the mixture in the first step, and reflux at 80° C. for 24 hours;

[0053] The 4th step, the mixed solution of the 3rd step of underpressure distillation, removes unnecessary thionyl chloride;

[0054] In the fifth step, 15 mL of pyridine was added to the product of the fourth step, and after adding 2 g of PEG400, reflux reaction at 120 ° C for 3 days;

[0055] In the sixth step, the mixture obtained in the fifth step was suction-filtered, washed with ethanol, and dried overnight at 60° C. in vacuum to obtain PEG400-modified graphene oxide.

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Abstract

The invention discloses a functional graphene oxide for adjusting and controlling the dispersibility of a solvent by using an organic chain segment as well as a preparation method thereof. The structural formula of the functional graphene oxide is shown in specification, wherein R is equal to R1, R2 and R3. The preparation method comprises the following steps: 1, dispersing graphite oxide prepared by a Hummers method in N, N-dimethylformamide to form uniform dispersion liquid; 2, adding a thionyl chloride agent into the product obtained in step 1 to perform reflux reaction to synthesize an intermediate product of graphite oxide activated by acyl chloride; 3, distilling the mixed liquor obtained in step 2 under reduced pressure to remove excessive thionyl chloride; 4, adding pyridine and graft organic molecules into the product obtained in step 3, and heating and stirring the mixture; and 5, filtering, washing and then drying the mixed liquor obtained in step 4. The functional grapheneoxide can disperse well in different solvents, particularly solvents with low polarity and low boiling point, can be preferably compatible with multiple polymer molecules, leads the preparation of nano particles / polymer nano composite materials to be possible, and has good application prospects and economic benefits.

Description

technical field [0001] The invention relates to a surface modification technology of graphene oxide and its dispersion technology in water and many organic solvents. In particular, it is a kind of graphene oxide and its preparation method that can realize the controllability of the solvent dispersion performance of functional graphene oxide by changing the organic chain segment, and can be dispersed in low polarity and low boiling point solvents. Background technique [0002] Graphene is the basic unit for constructing zero-dimensional fullerenes, one-dimensional carbon nanotubes, and three-dimensional graphite. It has unique carrier characteristics and excellent electrical properties. In 2004, Andre K. Geim's research group successfully prepared graphite layers with single atomic layer and finite atomic layer thickness. Since then, graphene has become one of the international hot topics in the fields of physics, chemistry, and materials science. [0003] Among them, one o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/00C01B31/04
Inventor 汪信张树鹏熊攀朱俊武杨绪杰
Owner NANJING UNIV OF SCI & TECH
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