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Characterization and influence of shear flow on the surface resistivity and mixing condition on the dispersion quality of multi-walled carbon nanotube/polycarbonate nanocomposites
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  • Journal title : Carbon letters
  • Volume 16, Issue 2,  2015, pp.86-92
  • Publisher : Korean Carbon Society
  • DOI : 10.5714/CL.2015.16.2.086
 Title & Authors
Characterization and influence of shear flow on the surface resistivity and mixing condition on the dispersion quality of multi-walled carbon nanotube/polycarbonate nanocomposites
Lee, Young Sil; Yoon, Kwan Han;
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 Abstract
Multi-walled carbon nanotube (MWCNT)/polycarbonate (PC) nanocomposite was prepared by direct melt mixing to investigate the effect of the shear rate on the surface resistivity of the nanocomposites. In this study, an experiment was carried out to observe the shear induced orientation of the MWCNT in the polymer matrix using a very simple melt flow indexer with various loads. The compression-molded, should be eliminated. MWCNT/PC nanocomposite sample exhibited lower percolation thresholds (at 0.8 vol%) and higher electrical conductivity values than those of samples extruded by capillary and injection molding. Shear induced orientation of MWCNT was observed via scanning electron microscopy, in the direction of flow in a PC matrix during the extrusion process. The surface resistivity rose with increasing shear rate, because of the breakdown of the network junctions between MWCNTs. For real applications such as injection molding and the extrusion process, the amount of the MWCNT in the composite should be carefully selected to adjust the electrical conductivity.
 Keywords
multi-walled carbon nanotubes;nanocomposite;surface resistivity;polycarbonate;orientation;percolation;
 Language
English
 Cited by
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Electromagnetic interference shielding effectiveness of nickel-plated MWCNTs/high-density polyethylene composites, Composites Part B: Engineering, 2016, 98, 120  crossref(new windwow)
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