| Summary: | 碩士 === 元智大學 === 機械工程學系 === 103 === Graphene and carbon nanotube with excellent mechanical and thermal properties have been considered as excellent reinforcements. In this investigation, various contents of graphene ranging from 0.3 to 1.0 wt. % were added to the epoxy to fabricate the nanocomposites. The mechanical and thermal properties of nanocomposites were characterized using tensile test and differential scanning calorimeter (DSC). Experimental results show that the Young’s modulus, yield strength, tensile strength and glass transition temperature of the nanocomposite are increasing with the increase of the graphene, while the fracture strain and toughness are decreasing with the increase of the graphene. The strengthening effect of the graphene to the nanocomposite is better than that of the multi-walled carbon nanotube. In addition, the effect of the mixture ratio between the graphene and multi-walled carbon nanotube on the mechanical properties of the nanocomposite was investigated. Experimental results indicate that nanocomposite with mixture ratio of 1:1 between the graphene and multi-walled carbon nanotube exhibits the best mechanical properties. The dispersion of graphenes in the epoxy based matrix was examined using scanning electronic microscope (SEM). The SEM images depict that graphenes are well dispersed resulting in the enhancement of the mechanical properties of the nanocomposites.
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