Processing and Characterization of Graphite Nano-Flake Composites

• Main Authors: Tsung-Lin Wu, 吳宗霖
• Other Authors: Wen-Shyong Kuo
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/15278761110844847463

博士 === 逢甲大學 === 機械與航空工程研究所博士班 === 96 === In this work, resin epoxy is served as matrix, while natural graphite is served as filling. The mechanical properties of resulting graphite composite are not that good as expected, comparing with pure resin. To improve such situation, processing techniques, such as intercalation and exfoliation, are employed to make natural graphite turn into exfoliated graphite(EG). Exfoliated graphite is partly composed by graphite nanosheets, which are the additives of first graphite nanosheet in this work. Three types of composites were made to represent for three levels of dispersed graphite nanosheets. The first was the impregnation of epoxy resin to the expanded graphite by resin transfer molding. No dispersion was applied, and the expanded graphite can retain its original shape. The second use a high-power sonication to break apart the expanded graphite. The thickness of the sonicated expanded graphite was reduced about 100 times. The third method was to use a three–roll mill of high-shear strain rate to separate the graphite nanosheets from the expanded graphite and to disperse them into the resin. The thickness range of the graphite nanosheets was 20~50 nm, about 100 times thinner than the sonicated ones. Compression, high-shear straining, impact, and Three Point Bending Tests were conducted. OM(optical microscope), SEM (scanning electron microscope) and other measure equipment are used to observe and analyze the characteristics of different graphite nanosheet composites. The influence of dispersion on the material behavior was studied. The result shows that the graphite nanosheet composite after three-roll mill has the best dispersing effect among all, and thus has the best mechanical properties.