Title: FABRICATION OF SOLVENT-CAST CARBON NANOTUBE-DISPERSED POLYPROPYLENE SHEET AND ITS TENSILE PROPERTIES
Authors: Keishi Naito, Tatsuya Maeda, Yui Horiguchi, Izuru Shimabukuro, Toshihira Irisawa, Kisaragi Yashiro
Abstract: Carbon nanotube (CNT)-dispersed polypropylene (PP) sheets are obtained via the solvent casting of a solution of PP in heated xylene in which CNTs had been dispersed by ultrasonication. Although the tensile properties of the resulting sheets are initially poor due to insufficient defibration of the CNTs under weak ultrasonication, this is improved via non-covalent modification by the addition of nanoclay (NC) to the CNT mixture. Alternatively, the tensile properties are improved by defibrating the CNTs under strong ultrasonication, and are further improved by pre-grinding the CNTs. After the strong defibration, however, the addition of NCs provides no further enhancement. In addition, better tensile properties are observed for the samples dried at 150°C relative to those dried at 130°C during solvent casting. As a result, the Young's modulus and tensile strength of the sample subjected to grinding, strong ultrasonication, and drying at 150°C are respectively 1.69 and 1.54 times those of the pristine PP. By comparison, the Young's modulus and tensile strength of samples subjected to twin-screw extrusion and injection molding are respectively 1.09 and 1.07 times those of the pristine PP. Thus, the present study suggests that the solvent-cast film has higher CNT dispersion and, hence, superior tensile properties.
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Conference: SAMPE 2023
Publication Date: 2023/04/17
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