| Summary: | 碩士 === 東海大學 === 化學工程與材料工程學系 === 106 === The research purpose of this study is to examine the effect of graphene nanoplatelets, which was added to the epoxy as a reinforcing agent, on the enhancement of the physical properties of the epoxy/graphene nanocomposites. Using different solvents mixed with the hardener dicyandiamide (DICY) and the accelerator 2-methylimidazole (2-MI), the stirred evenly with the epoxy and vacuum hot pressed to prepare the samples for characterization of morphological and physical properties.
The original graphene surface does not have any ionic or reactive groups. Therefore, oxidization to produce the reactive groups on the graphene surface is necessary, and then coupling agents were used for modifiying the grapheme oxide. We studied the effects of with graphene oxide or functionalized graphene on the properties of the nanocomposites. Ultrasonication was employed to achieve uniform mixing.
The dispersion of graphene nanoplatelets in composites and their effect on thermal conductivity and mechanical properties were examined. The composite morphology was observed with SEM. The composition and the degradation of the composites were investigated with TGA. DSC was used to analyze the curing behavior and thermal conductivity. The mechanical properties of the composite were examined with DMA. Finally, TMA was used to determine the linear thermal expansion of the composites.
From the experimental results, the addition of organically modified graphene improved the thermal properties, mechanical properties and thermal conductivity. Methanol as a solvent effectively dissolved hardener and accelerator.
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