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Method for functionalizing polymer on surface of nano graphene oxide

A technology of nano-graphene oxide and polymer, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of graphene research and application difficulties, insoluble in water, etc., and achieve accelerated development and application, the experimental process is simple, and the effect of a wide range of raw material sources

Inactive Publication Date: 2012-01-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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 functionalizing polymer on surface of nano graphene oxide
  • Method for functionalizing polymer on surface of nano graphene oxide
  • Method for functionalizing polymer on surface of nano graphene oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Mix 1.5 g of graphite powder and 40 mL of concentrated sulfuric acid and stir at room temperature (25°C) for 12 h, then add 9.0 g of potassium permanganate to the reactant, heat to 40°C and stir for 30 min, then put The temperature was slowly raised to 90 °C and heated for 90 min, then 69 mL of deionized water was added, heated to 105 °C and maintained for 25 min, after the heating was stopped, 210 mL of deionized water and 15 mL of 30% hydrogen peroxide were added, Let stand for a while, cool to normal temperature, filter with suction, and wash with 5% hydrochloric acid solution and distilled water successively until the pH of the filtrate is about 7, and finally obtain graphene oxide after vacuum drying.

[0024] (2) Weigh 5.0 g of polyethylene glycol monomethyl ether, dissolve and disperse it in dichloromethane, add 0.58 g of 1-pyrenebutyric acid, after dissolving, add 0.41 g of DCC, 0.012 g of DMAP, and react at 25°C After 24 h, after suction filtration, precipi...

Embodiment 2

[0029] (1) Graphene oxide is prepared with the same process steps as in Example 1;

[0030] (2) Weigh 5 g of polyethylene glycol monomethyl ether, dissolve and disperse it with N,N-dimethylformamide, add 0.58 g of pyrenebutyric acid, and after dissolving, add 0.41 g of DCC and 0.012 g of DMAP. Reaction at 30°C for 24 h, suction filtration, precipitation with ether, and vacuum drying to obtain polyethylene glycol Py-PEG with pyrenyl as the end group;

[0031] (3) Weigh 0.06 g graphene oxide, disperse it in 60 mL N,N-dimethylformamide and ultrasonically to form a uniformly dispersed graphene oxide solution with a mass concentration of 1 mg / mL, and then add 0.10 g Py -PEG, continue to ultrasonically disperse, remove the solvent by rotary evaporation, precipitate with methanol, and dry in vacuum to obtain graphene oxide grafted with Py-PEG through non-covalent bonds.

Embodiment 3

[0033] (1) Graphene oxide is prepared with the same process steps as in Example 1;

[0034] (2) Weigh 5 g of polyethylene glycol monomethyl ether, dissolve and disperse it in tetrahydrofuran, add 0.27 g of pyrenebutyric acid, and after dissolving, add 0.41 g of DCC and 0.012 g of DMAP, and react at 10°C for 48 h. After suction filtration, precipitation with ether, and vacuum drying, the polyethylene glycol Py-PEG with pyrenyl as the end group was obtained;

[0035] (3) Weigh 0.30 g graphene oxide, disperse it in 60 mL N,N-dimethylformamide and ultrasonically to form a uniformly dispersed graphene oxide solution with a mass concentration of 5 mg / mL, and then add 1.0 g Py -PEG, continue to ultrasonically disperse, remove the solvent by rotary evaporation, precipitate with methanol, and dry in vacuum to obtain graphene oxide grafted with Py-PEG through non-covalent bonds.

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Abstract

The invention relates to a method for functionalizing a polymer on the surface of nano graphene oxide. The method comprises the following specific steps: preparing graphene oxide from natural graphite powder by an improved Hummers method, utilizing methoxy polyethylene glycol and pyrene acids to carry out esterification to generate polyethylene glycol with pyrenyl as the terminal group, and finally grafting the polyethylene glycol with pyrenyl as the terminal group on the surface of graphene oxide through pi-pi interaction between pyrenyl and the surface of graphene oxide, thus obtaining the graphene oxide with the functionalized polymer on the surface. The solubility of the prepared graphene oxide with the functionalized polymer on the surface is greatly improved. The method has the following advantages: a main process adopted in the experiment is as follows: a polymer with a complex structure is designed and prepared in advance and then is grafted on the graphene oxide, and the grafting reaction can be carried out at normal temperature and pressure, so the whole experiment process is very simple and convenient. Therefore, the study provides a direct method for modifying the graphene oxide and preparing the functionalized graphene oxide-polymer complex to form a new inorganic-organic hybrid material, thereby promoting the development and application of graphene oxide-based materials.

Description

technical field [0001] The invention relates to a preparation method of nanomaterials, in particular to a method for functionalizing nanometer graphene oxide surface polymers. Background technique [0002] Graphene is a new type of material discovered by British scientist Geim in 2004 (Novoselov KS, Geim A K, Firsov A A. Science, 2004, 306: 666~669). A new type of two-dimensional atomic crystal composed of a single atomic layer, whose structural unit is the most stable six-membered ring in organic materials, is currently the most ideal two-dimensional nanomaterial. Graphene is very stable in structure and is one of the thinnest known materials. Graphene also has many novel properties, such as room temperature quantum Hall effect, massless transport properties, optical properties, thermoelectric transport properties, light transmittance and extremely high Young's modulus, etc. Due to these properties of graphene, graphene and graphene-based materials have potential applicat...

Claims

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Application Information

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IPC IPC(8): C01B31/04B82Y30/00B82Y40/00
Inventor 袁伟忠张匆
Owner TONGJI UNIV
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