| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系 === 97 === This research is mainly divided into two parts: First, multi-wall carbon nanotubes (MWNTs) were synthesized by arc discharged method and it also studies the influences of the intensity of electricity and gas flow rates on the quality and yields of MWNTs. Moreover, carbon nanotubes were purified by chemical vapor phase oxidation. The structures and qualities of MWNTs were characterized by transmission electron microscope (TEM), field emission scanning electrical microscope (FE-SEM), fourier transform infrared spectrum (FTIR), and Raman spectroscopy. The results showed that the synthesized MWNTs are ranging in number five to dozens. The highest yield of MWNTs was obtained from gas flow rate at 2.5 L/min and the intensity of electricity at 120A, and the best crystalinity and purity of MWNTs were obtained from gas flow rate at 7.5 L/min and the intensity of electricity at 100A. The amorphous carbonaceous were decreasing after being purified by nitric acid oxidation.
In the second part, the epoxy micro/nano composites were prepared by epoxy resins with various inorganic materials such as self-synthesized MWNTs, vapor grown carbon fiber (VGCF), aluminum nitride and aluminum oxide. The curing behavior of curable resins were studied by differential scanning calorimeter (DSC) and the properties of cured resins were studies by FE-SEM, dynamic mechanical analysis (DMA), thermal gravimetric analysis (TGA) and thermal conductivity meter. The result showed that the more filler were added, the better dispersion in the resins. The glass transition temperature (Tg) and char yield were increased by increase filler contents. The thermal conductivity of high aspect ratio MWNTs and VGCF which contained 70% filler were obvious than filler of aluminum nitride and aluminum oxide. Moreover, a thermal conductivity of 6.276 W/mK was obtained when carbon fiber fillers content up to 70%.
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