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A rapid method for covalently functionalizing graphene with polystyrene

A technology of polystyrene and graphene, which is applied in the treatment of dyed low-molecular organic compounds, dyed high-molecular organic compounds, fibrous fillers, etc., can solve the problems of poor compatibility between graphene and organic polymers, and achieve monomer The effect of wide application, mild polymerization conditions and simple steps

Inactive Publication Date: 2016-01-20
HUNAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose a mild and efficient method to covalently bond polystyrene to the surface of graphene, realize functional modification to it, and solve the problems of poor compatibility between graphene and organic polymers

Method used

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  • A rapid method for covalently functionalizing graphene with polystyrene
  • A rapid method for covalently functionalizing graphene with polystyrene
  • A rapid method for covalently functionalizing graphene with polystyrene

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Embodiment 1

[0028] A method for covalently functionalizing graphene with polystyrene quickly, the specific steps are as follows:

[0029] 1) Preparation of graphene oxide: graphene oxide prepared by Hummers method: add 1.0 g of dried flake graphite, 1.2 g of potassium nitrate, and 46 ml of concentrated sulfuric acid into a 250 ml four-necked flask, and mix them evenly under the action of ultrasound , then stirred in an ice-water bath and slowly added 6.0 g of potassium permanganate. Subsequently, the temperature of the reaction system was raised to 40° C., and the reaction was stirred at high speed for 6 hours. Then, while slowly adding 80 milliliters of distilled water, the system was heated up to 70° C. and reacted for half an hour. Then add 100 milliliters of distilled water and 6 milliliters of hydrogen peroxide (mass percentage concentration is 30%) to the system, and stop the reaction after 5 minutes to obtain a bright yellow graphene oxide mother liquor, and add an appropriate amo...

Embodiment 2

[0041] Weigh 50 milligrams of polystyrene covalently functionalized graphene and add it to 50 ml of THF, and ultrasonically disperse it for 5 minutes. Experiments show that polystyrene covalently functionalized graphene has good dispersion in THF. There is no delamination, and the dispersion effect of polystyrene covalently functionalized graphene in THF is shown in Figure 7 (a).

Embodiment 3

[0043] Solvent is DMF, and other conditions are the same as embodiment 2, and experiment shows, polystyrene covalently functionalized graphene has good dispersibility in DMF, puts 6 months and does not see delamination, polystyrene covalently functionalized graphite See the diagram of the dispersion effect of alkenes in DMF Figure 7 (b).

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Abstract

A method for quickly covalently functionalizing graphene with polystyrene disclosed by the invention is to adopt a mild and efficient method to covalently bond polystyrene to the surface of graphene, and realize functional modification to it . Firstly, graphene oxide was prepared by Hummers method, then alkynylated graphene was prepared, then polystyrene was prepared by RAFT method, and finally polystyrene covalently functionalized graphene was prepared by "Click Chemistry" (Click? Chemistry) . "Click? Chemistry" is a new method to realize the linking of substances. This method has the advantages of simple reaction operation, mild conditions, stereoselectivity of reaction, easy separation of products, simple post-treatment, less side reactions and high reaction recovery rate. Experiments show that the prepared polystyrene covalently functionalized graphene has good compatibility in organic solvents. The product can be used directly as a nanocomposite or as a filler to reinforce polymeric materials.

Description

technical field [0001] The invention belongs to the field of chemical composite materials, and in particular relates to a method for rapidly covalently functionalizing graphene with polystyrene. Background technique [0002] Graphene oxide polymer composites have broad application prospects, but there are often many difficulties in the processing of such composite materials, mainly due to its weak interface with polymer materials and poor compatibility. Compared with non-covalent modification, the covalent modification of graphene and graphene oxide has stronger valence bond force, which can not only solve this problem well, but also endow it with new properties and expand its application field. The surface layer of graphene oxide contains a large number of oxygen-containing groups such as hydroxyl, carboxyl, and epoxy groups, which provide reaction sites for the covalent bond modification of graphene oxide. For example, under the condition of adding dicyclohexylcarboimide ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/46C09C3/08C09C3/10C08F112/08C08F2/38
Inventor 欧宝立何聪李政峰周虎周智华
Owner HUNAN UNIV OF SCI & TECH