The Preparation Of Carbon Nanotubes/Carbon Fiber Multi-scale Reinforcement And The Study Of Their Properties

In this paper, the study on the preparation of carbon nanotubes/carbon fiber multi-scale reinforcement by electrophoretic deposition method and its properties is described, and carbon nanotubes/Cr(CO)6/carbon fiber multi-scale reinforcement was prepared. The surface morphology, mechanical properties and wettability of epoxy resin were mainly investigated.Single-walled carbon nanotubes were firstly purified by ultrasonication in a mixed acid and dispersed in ethanol. And then I have used the method of Suo’s extraction to treat the carbon fiber, clean out the sizing agent on the surface of carbon fiber, to improve the surface roughness of carbon fiber. A series of nanotubes/carbon fiber multi-scale reinforcement were prepared by electrophoretic deposition method at different voltages. After SEM, mechanical properties test and other means of characterization, it is proved that the performance of nanotubes/carbon fiber multi-scale prepared at 50V is excellent in all samples.Then carbon nanotubes/Cr(CO)6/carbon fiber multi-scale reinforcement with different Cr(CO)6 content were prepared by electrophoretic deposition method, we want to enhance the interaction between carbon nanotubes and carbon fibers by Cr(CO)6. After a series of test and characterization, the addition of Cr(CO)6 enhanced the surface morphology of the reinforcement, and the contact angle between the reinforcement and the epoxy resin was not greatly affected. Mechanical properties test showed that by adding Cr(CO)6, the interaction between carbon nanotubes and carbon fibers became more significant, and ultimately improved the mechanical properties of the reinforcement.In this paper, the preparation of the multi-scale reinforcement could not only improve the mechanical properties of the composites, but also could effectively improve the thermal stability of the composites, which was a major breakthrough in the study of the composite reinforcement.