Electrical properties of carbon black-filled polymer composites

Zois, H; Apekis, L; Omastova, M

dc.contributor.author	Zois, H	en
dc.contributor.author	Apekis, L	en
dc.contributor.author	Omastova, M	en
dc.date.accessioned	2014-03-01T02:41:52Z
dc.date.available	2014-03-01T02:41:52Z
dc.date.issued	2001	en
dc.identifier.issn	1022-1360	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30636
dc.subject	Electrical Properties	en
dc.subject	Carbon Black	en
dc.subject.classification	Polymer Science	en
dc.subject.other	carbon	en
dc.subject.other	polymer	en
dc.subject.other	concentration (parameters)	en
dc.subject.other	conference paper	en
dc.subject.other	dielectric constant	en
dc.subject.other	electric conductivity	en
dc.subject.other	measurement	en
dc.subject.other	permeability	en
dc.subject.other	spectroscopy	en
dc.subject.other	temperature dependence	en
dc.title	Electrical properties of carbon black-filled polymer composites	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1002/1521-3900(200106)170:1<249::AID-MASY249>3.0.CO;2-F	en
heal.identifier.secondary	http://dx.doi.org/10.1002/1521-3900(200106)170:1<249::AID-MASY249>3.0.CO;2-F	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	This work deals with the dielectric properties of conductive composite materials, which consist of thermoplastic polypropylene (PP) matrix filled with carbon black (CB). The CB concentration was systematically varied in a wide range. Our main interest is focused on the investigation of electrical conductivity mechanism and related percolation phenomena in these materials. To study the electrical and dielectric properties of composites we used broadband ac dielectric relaxation spectroscopy (DRS) techniques in a wide temperature range. By measurements of complex dielectric permittivity, epsilon*, the dependence of ac conductivity, sigma (ac), and dc conductivity, sigma (dc), on the frequency, the temperature and the concentration of the conductive filler was investigated. The behavior of this system is described by means of percolation theory. The percolation threshold, P-C, value was calculated to be 6.2 wt. % CB. Both, dielectric constant and dc conductivity follow power-law behavior, yielding values for the critical exponents, which are in good agreement with the theoretical ones. Indications for tunneling effect in the charge carriers transport through the composites are presented. The temperature dependence of dc conductivity gives evidence for the presence of positive temperature coefficient (PTC) effect.	en
heal.publisher	WILEY-V C H VERLAG GMBH	en
heal.journalName	Macromolecular Symposia	en
dc.identifier.doi	10.1002/1521-3900(200106)170:1<249::AID-MASY249>3.0.CO;2-F	en
dc.identifier.isi	ISI:000170297500029	en
dc.identifier.volume	170	en
dc.identifier.spage	249	en
dc.identifier.epage	256	en