Preparation method for polymer grafted graphene oxide

Abstract

The invention discloses a preparation method for polymer grafted graphene oxide. The method comprises the following steps: (1) carrying out pre-oxidation on graphite by using phosphorus pentoxide to obtain pre-oxidized graphite; (2) adopting potassium permanganate and concentrated sulfuric acid to oxidize the pre-oxidized graphite, and washing to obtain graphene oxide with hydroxyl on the surface; (3) mixing the graphene oxide with the hydroxyl on the surface and an alkene monomer, heating and introducing nitrogen, adding a tetravalent cerium ion-containing solution in a dropwise manner, carrying out a reaction for 1-6 hours while stirring under the case of nitrogen introducing, and carrying out treatments of filtering, washing and drying to obtain the polymer grafted graphene oxide. According to the present invention, a new method for preparing the polymer grafted graphene oxide is developed; the polymer grafted with the graphene oxide on the surface is obtained with one step through the redox polymerization method based on the graphene oxide, such that the steps are convenient, the reaction is safe, the environmental protection is achieved, and the efficiency is high.

Description

technical field [0001] The invention relates to a preparation method of polymer-grafted graphene oxide, which belongs to the field of preparation of inorganic-organic hybrid materials. Background technique [0002] Graphene is a new two-dimensional nanomaterial with a thickness of one atom, which has attracted much attention in recent years. It is reported to have a Young's modulus of 1,100 GPa, a fracture stress of 125 GPa, and a thermal conductivity of 5,000 Wm -1 K -1 , with a charge carrier mobility of 200,000 cm 2 V -1 S -1 , with a specific surface area of ​​2,630 m 2 g -1 . Therefore, both its theory and its experimental results show that the single-layer two-dimensional graphene sheet is the material with the highest mechanical strength found so far. In addition, this new class of materials has high electrical and thermal conductivity, stiffness, and high aspect ratio. Therefore, it has broad application prospects in the fields of transistors, supercapacitor...

AI Technical Summary

Problems solved by technology

However, the above preparation methods have the following problems: (1) It is very difficult to prepare graphene in large quantities at present, because the existing methods for preparing graphene mainly include: chemical vapor deposition, micromechanical exfoliation of graphite, and epitaxial growth on the surface of an insulator; but These three methods are expensive and cannot prepare graphene in large quantities; (2) Due to the lack of active centers on the surface of graphene, it is difficult to prepare hybrid materials with excellent properties with polymers.

However, the above-mentioned preparation method is to first blend the initiator with graphene oxide and the monomer, and then initiate monomer polymerization; because the free radical is generated by the initiator, some free radicals are connected to the graphene during the polymerization process to form graft polymerization Therefore, there are many homopolymers (homopolymers) in the system, so the preparation is a blend of graft copolymers and homopolymers, and the above-mentioned preparation method has poor control of grafting, and the thickness of the obtained polymer is not good. Uniformity, and the problem that the organic solvent used is difficult to remove

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