Electrical/dielectric properties and conduction mechanism in melt processed polyamide/multi-walled carbon nanotubes composites

Logakis, E; Pandis, Ch; Peoglos, V; Pissis, P; Pionteck, J; Potschke, P; Micusik, M; Omastova, M

dc.contributor.author	Logakis, E	en
dc.contributor.author	Pandis, Ch	en
dc.contributor.author	Peoglos, V	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Pionteck, J	en
dc.contributor.author	Potschke, P	en
dc.contributor.author	Micusik, M	en
dc.contributor.author	Omastova, M	en
dc.date.accessioned	2014-03-01T01:30:19Z
dc.date.available	2014-03-01T01:30:19Z
dc.date.issued	2009	en
dc.identifier.issn	0032-3861	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19546
dc.subject	Carbon nanotubes composites	en
dc.subject	Conduction mechanism	en
dc.subject	Dielectric properties	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Carbon nanotubes composites	en
dc.subject.other	Charge transport	en
dc.subject.other	CNT dispersion	en
dc.subject.other	Conduction mechanism	en
dc.subject.other	Critical frequencies	en
dc.subject.other	Dc conductivity	en
dc.subject.other	Dielectric relaxation spectroscopy	en
dc.subject.other	Electrical and dielectric properties	en
dc.subject.other	Excluded volume	en
dc.subject.other	matrix	en
dc.subject.other	Melt mixing	en
dc.subject.other	Percolation thresholds	en
dc.subject.other	Polyamide 6	en
dc.subject.other	Polymeric matrices	en
dc.subject.other	Relaxation mechanism	en
dc.subject.other	Temperature dependence	en
dc.subject.other	Temperature range	en
dc.subject.other	Theoretical models	en
dc.subject.other	Thermal fluctuations	en
dc.subject.other	Aspect ratio	en
dc.subject.other	Carbon nanotubes	en
dc.subject.other	Ceramic capacitors	en
dc.subject.other	Dielectric properties of solids	en
dc.subject.other	Electric properties	en
dc.subject.other	Glass transition	en
dc.subject.other	Nanocomposites	en
dc.subject.other	Solvents	en
dc.subject.other	Spectroscopy	en
dc.subject.other	Transmission electron microscopy	en
dc.subject.other	Multiwalled carbon nanotubes (MWCN)	en
dc.subject.other	carbon	en
dc.subject.other	dielectric property	en
dc.subject.other	dispersion	en
dc.subject.other	electrical property	en
dc.subject.other	nanocomposite	en
dc.subject.other	nanotube	en
dc.subject.other	synthetic polyamide	en
dc.subject.other	temperature effect	en
dc.subject.other	theoretical analysis	en
dc.title	Electrical/dielectric properties and conduction mechanism in melt processed polyamide/multi-walled carbon nanotubes composites	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.polymer.2009.08.038	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.polymer.2009.08.038	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	The electrical and dielectric properties of polyamide 6 (PA6)/multi-walled carbon nanotubes (MWCNT) nanocomposites prepared by melt mixing were investigated by employing dielectric relaxation spectroscopy in broad frequency (10(-2)-10(6) Hz) and temperature ranges (from -150 to 150 degrees C). Transmission electron microscopy revealed a good state of CNT dispersion in the polymeric matrix. The percolation threshold (p(c)) was found to be 1.7 vol.% by using the dependence of both dc conductivity and critical frequency (f(c)) from dc to ac transition on vol.% concentration in MWCNT. The actual aspect ratio of the nanotubes in the nanocomposites was calculated using a theoretical model (proposed by Garboczi et al.) and the obtained value was correlated with the p(c) value according to the excluded volume theory. Additionally, the contact resistance (R-c) between the conductive nanotubes was found to be similar to 10(5) Omega. Investigation of the temperature dependence of conductivity revealed a charge transport which is controlled by thermal fluctuation-induced tunneling for temperatures up to the glass transition. Finally, it was shown that the addition of nanotubes has no significant influence on the relaxation mechanisms of the PA6 matrix. (C) 2009 Elsevier Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Polymer	en
dc.identifier.doi	10.1016/j.polymer.2009.08.038	en
dc.identifier.isi	ISI:000270705700018	en
dc.identifier.volume	50	en
dc.identifier.issue	21	en
dc.identifier.spage	5103	en
dc.identifier.epage	5111	en