To improve interfacial interaction with the epoxy resin, carbon nanotube (CNT) and graphene nanoplatelet (GNP) are fluorinated. A surface-chemical property of the surface-treated CNT and GNP has been analyzed by X-ray photoelectron microscopy (XPS). Then the mechanical properties and thermal stabilities of composites which are reinforced by them are also evaluated. The mechanical properties of CNT/GNP reinforced epoxy composites are comparatively higher than those of epoxy composites reinforced with CNT only. These results are attributed to a size effect resulted from the network structures due to different aspect ratios of reinforcement. The tensile, impact strength, and thermal stability of the composites including fluorinated CNT and GNP are remarkably increased by 101, 69, and 130% compared to those of neat epoxy, respectively. These results are attributed to the synergy effect of the size effect and improvement of interfacial interaction between surface-treated reinforcements and epoxy resin.
To improve properties of epoxy composites, surfaces of the illite and carbon nanotube (CNT) were treated by fluorine gas. The fluorinated illite and CNT were then characterized by X-ray photoelectron microscopy (XPS) and the mechanical and thermal properties of their composites were evaluated. The tensile and impact strengths and thermal stability of the composites increased upto about 59%, 18% and 124%, respectively compared to those of the neat epoxy. Improvements of mechanical and thermal properties in the composites were attributed that the fluorination of illite and carbon nanotube helps to enhance the dispersion in epoxy resin and interfacial interaction between them.
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