Polystyrene-graphene oxide composite bulk material, graphene-based porous bulk material and preparation methods of polystyrene-graphene oxide composite bulk material and graphene-based porous bulk material

Abstract

The invention discloses a polystyrene-graphene oxide composite bulk material and a preparation method thereof. The preparation method comprises the steps as follows: a polystyrene microsphere emulsionand graphene oxide are mixed, an organic solvent which can be dissolved in water and has the surface tension value smaller than 40 mN / m IS ADDED, THE polystyrene microsphere emulsion are demulsifiedand coagulated, and the polystyrene-graphene oxide composite bulk material is obtained after drying. The preparation method is simple in process, green and safe. The invention also provides a preparation method of the graphene-based porous bulk material. According to the preparation method, the polystyrene-graphene oxide composite bulk material is calcined at high temperature in a protective atmosphere, so that the graphene-based porous bulk material adopting a porous structure is obtained and is applied to an electrode material of supercapacitors.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polystyrene-graphene oxide composite block material, a graphene-based porous block material and a preparation method thereof. Background technique [0002] Polystyrene (PS) is one of the most common industrial materials with multiple uses, and the processing technology of PS molding plays a vital role. [0003] Graphene has good electrical conductivity, mechanical properties, thermal conductivity, etc. Therefore, the introduction of graphene and its derivatives often has obvious effects on improving the electrical conductivity, mechanical toughness, and thermal degradation temperature of polymer materials represented by PS. . Since both graphene and PS have benzene ring units, the π electrons in similar units tend to stack each other (π-π stacking), which makes graphene and its derivatives easy to interact with PS, making the combination of the two theoretically feas...

AI Technical Summary

Problems solved by technology

[0004] The methods disclosed in the prior art for preparing polystyrene, graphene and their derivatives composite molding block materials are divided into physical mixing method and chemical mixing method; wherein, physical mixing method includes melt blending injection molding and compression molding, etc., the above-mentioned The method is to mechanically mix or melt mix polystyrene and graphene and its derivatives directly, and there is a problem of uneven dispersion of graphene and its derivatives in the polystyrene matrix; and the chemical mixing method includes high internal phase emulsion method (HIPE), solution blending method, graft polymerization method, etc., although the above method can realize the uniform dispersion of graphene and its derivatives mixed with polystyrene, it brings other problems simultaneously: except the high internal phase emulsion method ( HIPE), the samples prepared by other methods are all in powder form, and need to be put into the mold for further high-temperature and high-pressure molding; while the graft polymerization method needs to introduce polystyrene chain ends and graphene planes through chemical reactions. Small molecules such as azide ions and terminal alkynes can be grafted and combined with polystyrene chains and graphene sheets through the chemical reaction of highly active small molecules, and the process of introducing highly active small molecules requires harsh and complicated reactions. Conditions and expensive reagents; for the high internal phase emulsion method (HIPE), although styrene (St) can be directly polymerized after blending with graphene oxide (GO), the products obtained by this method are limited to macroporous structures, It cannot meet the specific requirements of improving the densification and mechanical properties of the material

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