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Journal of Nanomaterials
Volume 2015, Article ID 405345, 7 pages
http://dx.doi.org/10.1155/2015/405345
Research Article

Current-Voltage Characteristics of the Composites Based on Epoxy Resin and Carbon Nanotubes

1Institute of Chemical and Environment Engineering, West Pomeranian University of Technology, Pułaskiego 10, 70-322 Szczecin, Poland
2Institute of Organic Chemical Technology, West Pomeranian University of Technology, Pułaskiego 10, 70-322 Szczecin, Poland

Received 20 October 2014; Revised 7 January 2015; Accepted 8 January 2015

Academic Editor: Bo Tan

Copyright © 2015 Iwona Pełech et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Polymer composites based on epoxy resin were prepared. Multiwalled carbon nanotubes synthesized on iron-cobalt catalyst were applied as a filler in a polymer matrix. Chlorine or hydroxyl groups were incorporated on the carbon nanotubes surface via chlorination or chlorination followed by hydroxylation. The effect of functionalized carbon nanotubes on the epoxy resin matrix is discussed in terms of the state of CNTs dispersion in composites as well as electrical properties. For the obtained materials current-voltage characteristics were determined. They had a nonlinear character and were well described by an exponential-type equation. For all the obtained materials the percolation threshold occurred at a concentration of about 1 wt%. At a higher filler concentration >2 wt%, better conductivity was demonstrated by polymer composites with raw carbon nanotubes. At a lower filler concentration <2 wt%, higher values of electrical conductivity were obtained for polymer composites with modified carbon nanotubes.