Conductive mechanism of polymer/graphite conducting composites with low percolation threshold

Bershtein, VA; Egorova, LM; Yakushev, PN; Pissis, P; Sysel, P; Brozova, L

dc.contributor.author	Bershtein, VA	en
dc.contributor.author	Egorova, LM	en
dc.contributor.author	Yakushev, PN	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Sysel, P	en
dc.contributor.author	Brozova, L	en
dc.date.accessioned	2014-03-01T01:51:50Z
dc.date.available	2014-03-01T01:51:50Z
dc.date.issued	2002	en
dc.identifier.issn	08876266	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/26478
dc.subject	Conducting composites	en
dc.subject	Expanded graphite	en
dc.subject	Nylon-6	en
dc.subject	Percolation threshold	en
dc.subject	Polystyrene	en
dc.subject.other	Calculations	en
dc.subject.other	Electric conductivity of solids	en
dc.subject.other	Graphite	en
dc.subject.other	Nonmetallic matrix composites	en
dc.subject.other	Nylon polymers	en
dc.subject.other	Optical microscopy	en
dc.subject.other	Percolation (solid state)	en
dc.subject.other	Polymerization	en
dc.subject.other	Flory theory	en
dc.subject.other	Optical micrographs	en
dc.subject.other	Polystyrenes	en
dc.title	Conductive mechanism of polymer/graphite conducting composites with low percolation threshold	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/polb.10141	en
heal.identifier.secondary	http://dx.doi.org/10.1002/polb.10141	en
heal.publicationDate	2002	en
heal.abstract	Preparation of the conducting composites of polystyrene/expanded graphite via in situ polymerization and investigation of the conductive mechanism were carried out. They are characterized by high conductivity and a low percolation threshold. The electrical conductivity reached 10-2 S/cm with 3.0 vol % expanded graphite content, whereas the percolation threshold was 1.0 vol %. Optical micrographs revealed the heterogeneous distribution of the graphite particles and the formation of a conductive network in the polymer matrix. A model of primary particle was proposed to interpret the conductive phenomena. The primary particle is the basic conductive unit in the composites that comprises three of the following parts: the graphite particle, the compact-adsorbed layer, and the wrapping shell. Our model was also used to explain the experimental data in our previous studies on nylon-6/expanded graphite composites. A low percolation threshold of conducting composites can be also explained according to the model of the primary particle. Furthermore, the theoretical line of conductivity versus primary particle content calculated from the revised Flory's theory fits the experimental data well.	en
heal.journalName	Journal of Polymer Science, Part B: Polymer Physics	en
dc.identifier.doi	10.1002/polb.10141	en
dc.identifier.volume	40	en
dc.identifier.issue	10	en
dc.identifier.spage	954	en
dc.identifier.epage	963	en