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Effect of Carbon Nanotube Pre-treatment on Dispersion and Electrical Properties of Melt Mixed Multi-Walled Carbon Nanotubes / Poly(methyl methacrylate) Composites  

Park Won Ki (Department of Chemical Engineering, Yonsei University)
Kim Jung Uyun (Department of Chemical Engineering, Yonsei University)
Lee Sang-Soo (Polymer Hybrids Research Center, Korea Institute of Science and Technology)
Kim Junkyung (Polymer Hybrids Research Center, Korea Institute of Science and Technology)
Lee Geon-Woong (Polymer Hybrids Research Center, Korea Institute of Science and Technology)
Park Min (Polymer Hybrids Research Center, Korea Institute of Science and Technology)
Publication Information
Macromolecular Research / v.13, no.3, 2005 , pp. 206-211 More about this Journal
Abstract
Multi-walled carbon nanotubes (MWNTs) pre-treated by concentrated mixed acid or oxidized at high temperature were melt mixed with poly(methyl methacrylate) (PMMA) using a twin screw extruder. The morphologies and electrical properties of the MWNT/PMMA composites were investigated. The thermally treated MWNTs (t-MWNTs) were well dispersed, whereas the acid treated MWNTs (a-MWNTs) were highly entangled, forming large-sized clusters. The resulting electrical properties of the composites were analyzed in terms of the carbon nanotube (CNT) dispersion. The experimental percolation threshold was estimated to be $3 wt\%$ of t-MWNTs, but no percolation occurred at similar concentrations in the a-MWNT composites, due to the poor dispersion in the matrix.
Keywords
carbon nanotubes; CNT/polymer composites; electrical conductivity; acid treatment; thermal treatment; melt mixing.;
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