Highly water-dispersible hyperbranched polyglycerol surface-modified graphene preparation method

A technology of surface modification and polyglycerol, which is applied in the field of preparation of nanocomposite materials, can solve problems such as cumbersome steps, potential safety hazards, and complicated operations, and achieve the effects of improving water dispersibility, preventing irreversible agglomeration, and easy operation

Inactive Publication Date: 2015-08-19
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are reports of hyperbranched polyglycerol modified graphene oxide (Tuan Anh Pham, Nanjundan Ashok Kumar, Yeon Tae Jeong. Covalent functionalization of graphene oxide with polyglycerol and their use as templates for anchoring magnetic nanoparticles. Synthetic Metals. 2010, 160, 2028–2036), but there is no report on the covalent grafting of hyperbranched polyglycerol on the surface of graphene
In addition, potassium methoxide is used in the preparation method reported in the above literature, which is a highly toxic chemical reagent, and in the synthesis process, the steps are cumbersome and the operation is complicated
This makes it a potential safety hazard during application, especially in the field of life medicine, and is not conducive to mass production

Method used

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  • Highly water-dispersible hyperbranched polyglycerol surface-modified graphene preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mix 50 mg of dry graphite oxide powder prepared by the modified Hummers method with 7 mL of glycidol with a purity of 96%, and disperse ultrasonically for 1 hour at room temperature under ultrasonic conditions with a power of 500 W; Pour the solution into a 25mL round-bottomed flask, place the round-bottomed flask in an oil bath at 100°C, pass through nitrogen to isolate the air, and stir for 10 hours using magnetic force; after cooling the finally obtained bright black colloidal solution to room temperature naturally, add 50mL of anhydrous methanol, sonicated in a water bath for 10min, then added 100mL of acetone into the solution, after standing for a while, a black solid precipitated out of the solution, and the supernatant was discarded to obtain a black solid. After this washing process was repeated 3 times, the black solid was vacuum-dried at room temperature for 8 hours to obtain a black powder, which was ultrasonicated in a water bath for 5 minutes, and all of it...

Embodiment 2

[0026] Mix 100 mg of dry graphite oxide powder prepared by the modified Hummers method with 10 mL of glycidol with a purity of 96%, and disperse ultrasonically for 2 hours at room temperature under ultrasonic conditions with a power of 500 W; Pour the solution into a 25mL round-bottomed flask, place the round-bottomed flask in an oil bath at 110°C, pass through nitrogen to isolate the air, and stir for 15 hours using a magnetic force; after cooling the finally obtained bright black colloidal solution to room temperature naturally, use 100mL of anhydrous methanol, sonicated in a water bath for 15min, then added 200mL of acetone into the solution, after standing for a while, a black solid precipitated out of the solution, and the supernatant was discarded to obtain a black solid. After this washing process was repeated 3 times, the black solid was vacuum-dried at room temperature for 9 hours to obtain a black powder, which was uniformly dispersed in 100 mL of water by ultrasonica...

Embodiment 3

[0029] Mix 150 mg of dry graphite oxide powder prepared by the modified Hummers method with 15 mL of glycidol with a purity of 96%, and disperse ultrasonically for 1 hour at room temperature under ultrasonic conditions with a power of 500 W; Pour the solution into a 25mL round-bottomed flask, place the round-bottomed flask in an oil bath at 120°C, pass through nitrogen to isolate the air, and stir for 17 hours using a magnetic force; after cooling the finally obtained bright black colloidal solution to room temperature naturally, use 150mL of anhydrous methanol, sonicate in a water bath for 20min, then add 300mL of acetone into the solution, after standing for a while, a black solid precipitates out of the solution, pour off the supernatant to obtain a black solid. After this washing process was repeated 3 times, the black solid was vacuum-dried at room temperature for 10 hours to obtain a black powder, which was uniformly dispersed in 150 mL of water by ultrasonication in a wa...

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Abstract

The present invention relates to a highly water-dispersible hyperbranched polyglycerol surface-modified graphene preparation method, which comprises: 1) mixing graphite oxide and glycidol, and carrying out ultrasonic dispersion; 2) pouring the dispersion liquid into a flask, heating and stirring so as to initiate a glycidol ring-opening polymerization reaction, cooling the obtained colloidal solution to a room temperature, re-dispersing, carrying out an ultrasound treatment, adding acetone, standing, precipitating a black solid from the solution, removing the supernatant to obtain the black solid, repeatedly performing three times, and carrying out vacuum drying to obtain black powder; and 3) dispersing the black powder, carrying out water bath ultrasound, adding a reducing agent to the dispersion liquid at a room temperature, stirring, carrying out dialysis, carrying out centrifugation, and carrying out freeze-drying on the precipitate so as to obtain the finished product. Compared with the method in the prior art, the method of the present invention has the following beneficial effects that (1) the operation is simple, green, and non-toxic; (2) the ring-opening polymerization of the reactant glycidol is easily achieved; and (3) the graphene water-dispersibility is improved.

Description

technical field [0001] The invention relates to a preparation method of a nanocomposite material, in particular to a preparation method of highly water-dispersible hyperbranched polyglycerol surface-modified graphene. Background technique [0002] In recent years, graphene has attracted a lot of attention as an emerging material. Graphene is a class of one-atom-thick sp 2 Hybrid carbon materials, however, can extend their lateral dimensions down to the micron scale. This unique structure makes graphene have some superior properties, such as super electrical conductivity and semiconducting properties, super high mechanical strength, excellent thermal conductivity, and large specific surface area. This makes graphene have great potential application value in many fields such as sensors, batteries, supercapacitors, hydrogen storage materials, nanoelectronic components and nanocomposites. [0003] Due to the formation of π-π bonds and van der Waals forces between the two-dime...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 蔡宁喻发全侯大军罗晓刚
Owner WUHAN INSTITUTE OF TECHNOLOGY
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