Percolation phenomena in polymers containing dispersed iron

Mamunya, YP; Muzychenko, YV; Pissis, P; Lebedev, EV; Shut, MI

dc.contributor.author	Mamunya, YP	en
dc.contributor.author	Muzychenko, YV	en
dc.contributor.author	Pissis, P	en
dc.contributor.author	Lebedev, EV	en
dc.contributor.author	Shut, MI	en
dc.date.accessioned	2014-03-01T01:18:11Z
dc.date.available	2014-03-01T01:18:11Z
dc.date.issued	2002	en
dc.identifier.issn	0032-3888	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14854
dc.subject	Iron	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Dielectric losses	en
dc.subject.other	Electric conductivity of solids	en
dc.subject.other	Extrusion	en
dc.subject.other	Fillers	en
dc.subject.other	Iron	en
dc.subject.other	Metals	en
dc.subject.other	Percolation (solid state)	en
dc.subject.other	Permittivity	en
dc.subject.other	Polyamides	en
dc.subject.other	Polyethylenes	en
dc.subject.other	Polymer blends	en
dc.subject.other	Thermal conductivity of solids	en
dc.subject.other	Filler spatial distribution	en
dc.subject.other	Metal polymer composites	en
dc.subject.other	Polyoxymethylene	en
dc.subject.other	Composite materials	en
dc.title	Percolation phenomena in polymers containing dispersed iron	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/pen.10930	en
heal.identifier.secondary	http://dx.doi.org/10.1002/pen.10930	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	Metal-polymer composites based on polyethylene (PE), polyoxymethylene (POM), polyamide (PA) and a PE/POM blend as matrix and dispersed iron (Fe) as Her have been prepared by extrusion of the appropriate mechanical mixtures, and their electrical conductivity, dielectric properties and thermal conductivity have been investigated. The filler spatial distribution is random in the PE-Fe, POM-Fe and PA-Fe composites. In the PE/POM-Fe composite the polymer matrix is two-phase and the filler is contained only in the POM phase, resulting in an ordered distribution of dispersed Fe in the volume of polymer blend. The transition through the percolation threshold (, is accompanied by a sharp increase of the values of conductivity a, dielectric constant epsilon' and dielectric loss tangent tan B. The critical indexes of the equations of the percolation theory are close to the theoretical ones in the PE-Fe and POM-Fe composites, whereas they take unusually high values in the PE/POMFe composite. Thus, t in the equation sigma similar to (phi - phi(c))(t) is 2.9-3.0 in the systems characterized by random distribution of dispersed filler and 8.0 in the PE/POM-Fe system. The percolation threshold (p, depends on the kind of polymer matrix, becoming 0.21, 0.24, 0.29 and 0.09 for the composites based on PE, POM, PA and PE/POM, respectively. Also the thermal parameters of the PE/POM-Fe composite are different from those of all other composites. A model explaining the unusual electrical characteristics of the composite based on the polymer blend (PE/POM-Fe) is proposed, in agreement with the results of optical microscopy.	en
heal.publisher	SOC PLASTICS ENG INC	en
heal.journalName	Polymer Engineering and Science	en
dc.identifier.doi	10.1002/pen.10930	en
dc.identifier.isi	ISI:000173737000008	en
dc.identifier.volume	42	en
dc.identifier.issue	1	en
dc.identifier.spage	90	en
dc.identifier.epage	100	en