Preparation method of functionalized graphene-polymer composite material

Abstract

The invention discloses a preparation method of a functionalized graphene-polymer composite material. The preparation method comprises the following steps: S1, dispersing graphene in a solvent to obtain a graphene dispersion liquid; S2, dissolving a polymer in a solvent to obtain a polymer solution; S3, mixing and stirring the graphene dispersion liquid and the polymer solution to obtain a graphene-polymer mixed dispersion liquid; S4, adding a vulcanizing aid into the graphene-polymer mixed dispersion liquid to obtain a mixture solution; S5, removing the solution in the obtained mixture solution to obtain a mixture solid; S6, cutting the mixture solid into small particles, and continuously drying the small particles for a period of time to obtain an unvulcanized original material; and S7,carrying out static hot pressing on the unvulcanized original material to obtain the functionalized composite material. According to the composite polymer material disclosed by the invention, the damage of a reduction reaction to the performance of the polymer material is avoided, and the heat conduction, electric conduction, barrier and mechanical properties of the polymer material are greatly improved.

Description

technical field [0001] The invention relates to the technical field of composite polymers, in particular to a preparation method of functionalized graphene and polymer composite materials. Background technique [0002] The dispersion structure of nanofillers in the polymer matrix has a great influence on the properties of polymer materials. Graphene is known for its extraordinary mechanical properties, electrical and thermal conductivity. Due to the regular structure of graphene nanosheets and the strong π-π interaction between sheets, directly using graphene as a polymer composite will cause a large amount of graphene to agglomerate, resulting in a decrease in material performance. The strong oxidation reaction can be used to exfoliate graphite into graphite oxide and introduce a large number of oxygen-containing functional groups into the carbon plane, such as carboxyl, epoxy, hydroxyl, carbonyl, etc. Due to the presence of these oxygen-containing functional groups, func...

AI Technical Summary

Problems solved by technology

However, in this patent, a chemical reducing agent is used to reduce the functionalized graphene in situ, and the degree of reduction is not easy to control. The reaction time is long and requires high-priced and high-energy ultrasonic equipment to assist dispersion. Even so, the formation of graphene sheets during the reduction process cannot be avoided. the reunion

At the same time, under the condition of low graphene content, the performance improvement of the material is limited. Under the condition of high content, the flexibility of the material decreases significantly, and the elongation at break decreases.