caa a22 4500 463232941 CHVBK 20180405153247.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s10853-006-0591-9 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0591-9 Effect of coating of graphite particles with polyaniline base on charge transport in epoxy-resin composites [Elektronische Daten] [Michaela Pelíšková, Jarmila Vilčáková, Robert Moučka, Petr Sáha, Jaroslav Stejskal, Otakar Quadrat] 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 20-52vol.% 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 10wt.% of polyaniline base at a particle concentration 50vol.%. The frequency and temperature dependences indicate that, in both cases, at the maximum loading used (52vol.%), the obtained material had ohmic conductivity. In contrast, the conductivity of epoxy composites of graphite particles, coated with 20wt.% of polyaniline base, only slightly increased over the whole range of particle concentrations. These findings suggest that, in the case of 10wt.% 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 20wt.% polyaniline coating forms a compact non-conducting layer on the surface of the graphite particles, thus preventing electrical contact. Springer Science+Business Media, LLC, 2007 Pelíšková Michaela Faculty of Technology, Tomas Bata University in Zlín, 762 72, Zlin, Czech Republic aut Vilčáková Jarmila Faculty of Technology, Tomas Bata University in Zlín, 762 72, Zlin, Czech Republic aut Moučka Robert Faculty of Technology, Tomas Bata University in Zlín, 762 72, Zlin, Czech Republic aut Sáha Petr Faculty of Technology, Tomas Bata University in Zlín, 762 72, Zlin, Czech Republic aut Stejskal Jaroslav Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06, Prague 6, Czech Republic aut Quadrat Otakar Faculty of Technology, Tomas Bata University in Zlín, 762 72, Zlin, Czech Republic aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/13(2007-07-01), 4942-4946 0022-2461 42:13<4942 2007 42 10853 https://doi.org/10.1007/s10853-006-0591-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0591-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pelíšková Michaela Faculty of Technology, Tomas Bata University in Zlín, 762 72, Zlin, Czech Republic aut NATIONALLICENCE 700 1- Vilčáková Jarmila Faculty of Technology, Tomas Bata University in Zlín, 762 72, Zlin, Czech Republic aut NATIONALLICENCE 700 1- Moučka Robert Faculty of Technology, Tomas Bata University in Zlín, 762 72, Zlin, Czech Republic aut NATIONALLICENCE 700 1- Sáha Petr Faculty of Technology, Tomas Bata University in Zlín, 762 72, Zlin, Czech Republic aut NATIONALLICENCE 700 1- Stejskal Jaroslav Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06, Prague 6, Czech Republic aut NATIONALLICENCE 700 1- Quadrat Otakar Faculty of Technology, Tomas Bata University in Zlín, 762 72, Zlin, Czech Republic aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/13(2007-07-01), 4942-4946 0022-2461 42:13<4942 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer