Performance Analysis Of Graphene Composite Films

Graphene has been extensively studied as a filler composite due to its excellent electrical,thermal and mechanical properties.In this paper,two kinds of composite films cured with different curing agents were studied.After testing the mechanical,electrical and sensing properties of these two composite films we discuss the application prospects of graphene-based composites in various fields.Firstly,we got the graphene raw materials by thermal expansion and low temperature ultrasound method.The graphene raw materials were added into epoxy resin as functional particles,and graphene/epoxy composite films were cured by adding D400 curing agent.The experimental results show that with the increase of graphene content in the film,the conductivity of the film increases continuously,from the complete non-conductivity of pure epoxy resin to the conductivity of 1E^-5s/cm at 2.5vol.%graphene content.The Young's modulus of the film also increased from 1.6 GPa of pure epoxy film to 3GPa,which increased by nearly 100%.The tensile strength of the films increased from 52 MPa to 65 MPa when a small amount of graphene?0-0.2vol.%?was added,then decreased slowly with the increase of graphene content,and finally stabilized near 40 MPa.This article then describes a flexible graphene/epoxy film prepared by the addition of a long chain flexible curing agent J2000,which has good flexibility and electrical conductivity and can be used for processing as a flexible sensor.The flexible film can directly detect the pressure sensing by directly connecting the wires and has the advantages of simple structure and convenient testing.In the sensing test,the sensitivity coefficient of the flexible film was 4when the graphene content reached 2.5vol.%.As the graphene content increases,the film's sensing coefficient begins to decrease,but the linearity increases.The film was applied to a health monitoring experiment.The 2.5vol.%graphene content film can achieve a resistance enhancement signal of 50%when monitoring actual human motion such as fist,so it is expected to have good results in preparing flexible wearable devices application.