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A kind of preparation method of polyethylene glycol modified graphene oxide

A polyethylene glycol modification, polyethylene glycol technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc. It does not affect the workability, the short process flow, and the effect of strength improvement

Active Publication Date: 2020-01-17
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the above background, the present invention provides a method for preparing modified graphene oxide. The stability of the graphene oxide prepared by the method is greatly improved in the cement-based material system, and its strength gain performance is better than that of unmodified graphene oxide. Graphene is stable, which solves the problems of sedimentation and agglomeration of graphene oxide materials in cement-based materials, as well as the resulting decrease in workability and limited performance, and does not affect workability while increasing strength

Method used

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  • A kind of preparation method of polyethylene glycol modified graphene oxide
  • A kind of preparation method of polyethylene glycol modified graphene oxide
  • A kind of preparation method of polyethylene glycol modified graphene oxide

Examples

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Embodiment 1

[0035] In an inert gas protection and drying environment, add 1 part of dried graphene oxide G to 500 parts of dried tetrahydrofuran, and ultrasonically disperse the system until a uniform dispersion is formed, then cool to 30 degrees Next, add 0.06 parts of sodium hydride (net mass), stir for 2 hours, and ensure that the temperature does not exceed 30 degrees during the stirring process, after that, add 0.6 parts of bromomethyl polyethylene glycol (Mw=800) The reaction was stirred for 24h. After the reaction was completed, 1.2 times the molar amount of sodium hydride was added to neutralize the sample with acetic acid, then concentrated by high-speed centrifugation, and the solvent was evaporated under reduced pressure to obtain polyethylene glycol-modified graphene oxide 1.

Embodiment 2

[0037]In an inert gas protection and dry environment, add 1 part of dried graphene oxide G to 500 parts of dried N,N-dimethylformamide, and ultrasonically disperse the system until a uniform dispersion is formed. After that, cool it to below 30 degrees, add 0.04 parts of sodium hydride (net mass), stir for 1 hour, and ensure that the temperature does not exceed 30 degrees during the stirring process, and then add 1.2 parts of methylpolyethylene p-toluenesulfonate Alcohol ester (Mw=2000), stirred and reacted at 30 degrees for 24h. After the reaction was completed, 1.2 times the molar amount of sodium hydride was added to neutralize the sample with acetic acid, then concentrated by high-speed centrifugation, and the solvent was evaporated under reduced pressure to obtain polyethylene glycol-modified graphene oxide 2.

Embodiment 3

[0039] In an inert gas protection and dry environment, add 0.5 parts by mass of dried graphene oxide G to 500 parts by mass of dried 1,4-dioxane, and ultrasonically disperse the system until a uniform dispersion is formed. , after that, cool down to below 30 degrees, add 0.02 parts of sodium hydride (net mass), stir for 2 hours, and ensure that the temperature does not exceed 30 degrees during the stirring process, and then add 0.8 parts of quality methyl polyethylene glycol glycidyl ether ( Mw=1500), stirred and reacted at 45 degrees for 24h. After the reaction was completed, 1.2 times the molar amount of sodium hydride was added to neutralize the sample, and then concentrated by high-speed centrifugation, and then the solvent was evaporated under reduced pressure to obtain polyethylene glycol-modified graphene oxide 3.

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Abstract

A method for preparing graphene oxide modified with polyethylene glycol is disclosed. Monomethyl modified polyethylene glycol M which can be subjected to nucleophilic substitution or cycloaddition isadopted as a modifying agent, and is subjected to a nucleophilic substitution / addition reaction with hydroxy in graphene oxide G nanosheet surfaces in an aprotic polar solvent S environment to preparea dispersion of graphene oxide G nanosheets subjected to in-surface modification with the polyethylene glycol, and then distillation is performed to remove the solvent to obtain the graphene oxide modified with polyethylene glycol. The modifying agent is easily available, the process is short, the method is easy to operate, and large-scale production and application are facilitated. The preparedgraphene oxide modified with polyethylene glycol has good stability in cement-base material environments, does not influence workability, and obviously improves strength with an extremely low doping amount.

Description

technical field [0001] The invention relates to a preparation method of polyethylene glycol-modified graphene oxide, which belongs to the field of building materials science and technology. Background technique [0002] Graphene oxide (GO) is a new type of two-dimensional nanomaterial that has attracted much attention in recent years. It is an intermediate for the preparation of graphene by redox method. It has the advantages of large specific surface area, abundant surface groups, and easy modification. In the field of building materials, many studies have shown that graphene oxide can effectively improve the strength of cement-based materials at very low dosages, and is one of the most promising nanomaterials in the field of building materials. However, the role of graphene in cement systems Stability has always been a difficult problem in the application. In the high-alkali and high-salt cement system, graphene oxide has a high tendency to coagulate, which makes its perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/198
Inventor 严涵杨勇冉千平黄振张建纲舒鑫翟树英李申桐
Owner JIANGSU SOBUTE NEW MATERIALS
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