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Journal of Materials Science

, Volume 42, Issue 13, pp 4942–4946 | Cite as

Effect of coating of graphite particles with polyaniline base on charge transport in epoxy-resin composites

  • Michaela Pelíšková
  • Jarmila Vilčáková
  • Robert Moučka
  • Petr Sáha
  • Jaroslav Stejskal
  • Otakar QuadratEmail author
Article

Abstract

Investigations of charge transport, in epoxy resin composites of graphite particles coated with a non-conducting polyaniline-base layer, showed that particle shape and surface structure may crucially affect the percolation behaviour of the systems. In contrast to the gradual increase in the DC conductivity of composites in the range 20–52 vol.% for pure graphite particles, due to their fragmentary nature, a steep rise of several orders of magnitude in conductivity, appeared in composites of graphite particles coated with 10 wt.% of polyaniline base at a particle concentration 50 vol.%. The frequency and temperature dependences indicate that, in both cases, at the maximum loading used (52 vol.%), the obtained material had ohmic conductivity. In contrast, the conductivity of epoxy composites of graphite particles, coated with 20 wt.% of polyaniline base, only slightly increased over the whole range of particle concentrations. These findings suggest that, in the case of 10 wt.% polyaniline coating, due to the irregular surface structure, a certain amount of uncoated material is present, which enables the formation of conducting contacts with ohmic conductivity in the percolation area. The 20 wt.% polyaniline coating forms a compact non-conducting layer on the surface of the graphite particles, thus preventing electrical contact.

Keywords

PANI Charge Transport Graphite Particle Epoxy Resin Composite Composite Conductivity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

Authors wish to thank the Ministry of Education, Youth, and Sports of the Czech Republic (ME 883 and MSM 7088352101) and Grant Agency of the Academy of Sciences of the Czech Republic (A 4050313) for the financial support.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Michaela Pelíšková
    • 1
  • Jarmila Vilčáková
    • 1
  • Robert Moučka
    • 1
  • Petr Sáha
    • 1
  • Jaroslav Stejskal
    • 2
  • Otakar Quadrat
    • 1
    Email author
  1. 1.Faculty of TechnologyTomas Bata University in ZlínZlinCzech Republic
  2. 2.Institute of Macromolecular ChemistryAcademy of Sciences of the Czech RepublicPrague 6Czech Republic

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