Preparation And Properties Of SEBS Grafted Graphene/epoxy Composites

The styrene-ethylene-butadiene-styrene（SEBS）grafted graphene oxide/epoxy（SEBS-g-GO/EP）nanocomposites were successfully prepared by modifying the curing agents of epoxy resin.The functionalized graphene oxide（GO）modified with1,6-hexanediamine（GO-NH₂）prevent the aggregation of GO itself as well as improve the compatibility between GO and polymer matrix.Styrene-ethylene-butadiene-styrene grafted GO-NH₂（SEBS-g-GO）prepared by the solution mixing techniques replaced of the traditional method.A series of materials characterization methods including the X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,Fourier transform-infrared spectroscopy（FT-IR）,scanning electron microscope（SEM）and transmission electron microscopic（TEM）were used to prove that SEBS has been grafted onto GO-NH₂ successfully of the SEBS-g-GO.The effects of SEBS-g-GO on the epoxy resin（EP）nanocomposites were investigated by thermogravimetric analysis（TGA）,dynamic mechanical analysis（DMA）,tensile,flexural and impact test.The tensile strength and flexural modulus of 0.3 wt%SEBS-g-GO filled with epoxy resin composites are 109.05%and 51.61%higher than that of pure epoxy resin,respectively.Also,impact strength is 139.32%greater than the pure epoxy resin.This is due to the fact that SEBS-g-GO and EP form the interface layer containing the elastic structure of SEBS by covalent bonding.Interface layer contributes to buffering and dispersing the force.The results also showed that SEBS-g-GO was uniformly dispersed in the epoxy resin matrix.Therefore,the mechanical and thermal properties of nanocomposites had been significantly improved.When adding 0.3 wt%SEBS-g-GO to carbon fiber（CF）/EP composites,the mechanical properties are greatly improved compared to CF/EP curing systems without SEBS-g-GO.The flexural strength,impact strength and interlaminar shear strength of CF/SEBS-g-GO/EP composites increased by 81.57%,84.84%and 86.14%,respectively.