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Preparation method of polystyrene/graphene composite particle

A composite technology of polystyrene particles and graphene, which is applied in the treatment of dyed polymer organic compounds, fibrous fillers, etc., can solve the problems of complex preparation steps and cumbersome processes, and achieve the effect of low material cost and easy storage and processing

Inactive Publication Date: 2012-02-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the above-mentioned preparation methods require pre-surface design and modification of the building units, and graphene or polyelectrolytes require multi-step adsorption and purification, making the preparation steps complicated and cumbersome.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a four-neck round-bottom flask, dissolve 2.5 g of polyvinylpyrrolidone in 160 ml of isopropanol, and raise the temperature to 70 oC. Then 0.2 g of azobisisobutyronitrile was dissolved in 20 g of styrene monomer, and added to the above solution under nitrogen protection. Under stirring, react at constant temperature for 24 hours and then cool to room temperature. The resulting dispersion was centrifuged, washed three times with ethanol and deionized water, respectively, and water was used to make a polystyrene particle dispersion with a solid content of 10 wt %, or commercially available polystyrene particles were used to make a polystyrene particle dispersion with water. Dispersion of vinyl particles.

[0019] The number average particle diameter of the polystyrene particles was 2800 nm.

[0020] At room temperature, 10 ml of 0.1 wt% graphene oxide suspension and 5 g of 10 wt% polystyrene particle dispersion were sequentially added to 150 ml of deionized water, the...

Embodiment 2

[0022] The polystyrene particle dispersion in Example 1 was used.

[0023] At room temperature, 5 ml of 0.1 wt% graphene oxide suspension and 5 g of 10 wt% polystyrene particle dispersion were sequentially added to 150 ml of deionized water, the mixture was heated to 80°C, and then added 0.1 ml of 80 wt% hydrazine hydrate was reacted for 24 hours. The system was gray-black, and the polystyrene / graphene composite particles were obtained by centrifugation and repeated washing with ethanol and deionized water. Scanning electron microscopy showed that graphene completely covered the polystyrene particles, and Raman spectroscopy confirmed that the characteristic peaks of graphene appeared, while the characteristic peaks of polystyrene became very weak.

Embodiment 3

[0025] Polystyrene particles with a number average particle diameter of 10 microns were used to prepare a polystyrene particle dispersion with water, with a solid content of 10 wt%.

[0026] At room temperature, 2.5 ml of 0.1 wt% graphene oxide suspension and 5 g of 10 wt% polystyrene particle dispersion were sequentially added to 150 ml of deionized water, the mixture was heated to 80°C, and then 0.05 mL of 80 wt% hydrazine hydrate was reacted for 24 hours. The system was gray, and polystyrene / graphene composite particles were obtained by centrifugation and repeated washing with ethanol and deionized water. Scanning electron microscopy showed that graphene completely covered polystyrene particles, and Raman spectroscopy confirmed that the characteristic peaks of graphene appeared, while the characteristic peaks of polystyrene became weaker.

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PUM

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Abstract

A preparation method of a polystyrene / graphene composite particle adopts common polystyrene particles without any surface modification or modification; polystyrene particle dispersion liquid is prepared with water; then a polystyrene / graphene composite particle is prepared by the following two approaches: A. mixing the polystyrene particle dispersion liquid with a graphene oxide suspension under stirring, heating to a certain temperature, adding hydrazine hydrate for reaction for 2-120 hours, performing centrifugation and washing to obtain the polystyrene / graphene composite particle; B. reducing the graphene oxide suspension into a graphene suspension by hydrazine hydrate, mixing the graphene suspension and the polystyrene particle dispersion liquid at room temperature, performing centrifugation and washing to obtain the polystyrene / graphene composite particle. A scanning electron microscope shows that the polystyrene particle is completely coated by graphene; a Raman spectrum confirmed that a characteristic peak of graphene appears, and a characteristic peak of polystyrene disappears.

Description

technical field [0001] The invention belongs to the technical field of nanometer functional materials, and in particular relates to a preparation method of polystyrene / graphene composite particles. technical background [0002] In recent years, graphene has attracted great attention due to its unique electrical, thermal and mechanical properties. It can be widely used in batteries, sensors, supercapacitors, energy storage devices and nanocomposites, etc. [0003] A simple and direct way to utilize graphene is to blend graphene with polymers to prepare graphene-based polymer composites. Usually, a simple liquid-phase blending method is used to directly mix the graphene suspension with the polymer solution. Secondly, the graphene suspension can also be blended with the polymer emulsion. In order to improve the distribution uniformity of graphene in composite materials, it is necessary to pre-treat the surface of graphene first, and then use some special treatment methods (s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/46C09C3/10
Inventor 王昭群李云兴顾昊薛奇
Owner NANJING UNIV
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