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http://dx.doi.org/10.5762/KAIS.2018.19.9.13

Effects of MWCNT type and flow type on the electrical conductivity of polycarbonate/MWCNT nanocomposites  

Bui, Duc Nhat (Division of Advanced Materials Science and Engineering, College of Engineering, Kongju National University)
Son, Younggon (Division of Advanced Materials Science and Engineering, College of Engineering, Kongju National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.19, no.9, 2018 , pp. 13-19 More about this Journal
Abstract
Effects of multiwall carbon nanotube (MWCNT) type and flow type (shear and elongational flow) on the electrical conductivity of polycarbonate (PC)/ MWCNT nanocomposites were investigated. Two different MWCNTs produced a huge difference in electrical conductivity in an injection molded PC/MWCNT nanocomposite. It was observed that MWCNTs having a higher aspect ratio provide much lower electrical conductivity in injection molded PC/MWCNT nanocomposites while the conductivities of compression molded samples from two different MWCNTs were the same. We found that this is due to a difference in the deformability of the two MWCNTs. As the aspect ratio of the MWCNT increases, the orientation of MWCNT by the external force becomes easier and the conductive path diminishes. Consequently the conductivity of the nanocomposites decreases. Nanocomposite samples prepared at a higher extensional rate and shear rate showed lower electrical conductivity. This is also attributed to the flow induced orientation and reduced conductive path of the MWCNTs. The experimental results were discussed in relation to variation in the tube-tube contact due to the change of the MWCNT orientation.
Keywords
carbon nanotube; polycarbonate; injection molding; spinning; nanocomposites;
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