Study And Prepare Of Multi-walled Carbon Nanotubes/graphene Nanoplatelets Hybird Mateirals

In recent years, hybrid materials with different mixtures have attracted large attention invarious fields. Hybrid materials have been tried out, especially based on carbon nanomaterials.The hybridization can combine the advantages of both carbon nanotubes and graphemehaving their remarkable properties that do not exist in the individual components. The uniquehollow seamless tubular structure of Carbon nanotubes and two-dimensional periodic latticehoneycomb structures of Graphene give them excellent performance. Especially in theapplication in enhancing the mechanical properties of composite materials, carbon nanotubesand graphene have coordinate enhanced and toughened effect. As the ideal reinforcedcomposite materials, carbon nanotubes/graphene hybrid materials can improve the mechanicalproperties of composite materials effectively.In this paper, one-dimensional carbon nanotubes(MWCNTs) and two-dimensionalgraphene nanoplatelets(GnPs) were chosen to prepare three-dimensional multi-walled carbonnanotubes/graphene nanoplatelets hybrid materials through facile physical and chemicalmethods according to "nano-micro structure" and "composite" design characteristics. Physicalmethod combined oxidized multi-walled carbon nanotubes(MWCNTs-OH) and hydroxylatedgraphene nanoplatelets(GnPs-OH) together through the π-stacking interaction by ultrasonicand centrifugal. Chemical methods through chemical grafting "Grafting-to" technicalprepared the structure controlled three-dimensional hybrid material. In multiple-step approach,poly (acryloyl chloride) was grafted onto MWCNTs-OH through the reaction between thehydroxyl groups of MWCNTs-OH and the acyl chloride groups of poly firstly. Second, theremaining acyl chloride groups of poly were allowed to react with the hydroxyl groups ofGnPs-OH. In one-step method, the MWCNTs-OH and GnPs-OH(1:1m/m) were evenlydispersed. Then poly react with the hydroxyl groups of oxidized multi-walled carbonnanotubes and hydroxylated graphene nanoplatelets. We also made a preliminary study of thehybrid materials in the application of enhanced toughening of epoxy resin.The hybrid materials thus obtained were characterized using Fourier transform infraredspectrometer(FTIR), transmission electron microscope(TEM), and thermal gravimetricanalysis(TGA). Conformational changes were monitored by Raman spectroscopy. The resultsindicated that the hybrid materials were effectively connected with each other. Compared withphysical method, hybrid material prepared by chemical method using polypropylene acylchloride as a bridge, can multiply the reactivity, and the structure is more stable. The results oftensile tests showed that the addition of carbon nanotubes/graphene hybrid materials in epoxyresin could effectively increase the toughness and strength of the epoxy resin. The hybridmaterial prepared by chemical method is better than others. Moreover, the tensile strength andtoughness of the epoxy resin composites were gradually increased by the addition of thecarbon nanotubes/graphene hybrid materials.