Structure-dependent conductivity and microhardness of metal-filled PVC composites

Mamunya, YP; Privalko, EG; Lebedev, EV; Privalko, VP; Balta Calleja, FJ; Pissis, P

dc.contributor.author	Mamunya, YP	en
dc.contributor.author	Privalko, EG	en
dc.contributor.author	Lebedev, EV	en
dc.contributor.author	Privalko, VP	en
dc.contributor.author	Balta Calleja, FJ	en
dc.contributor.author	Pissis, P	en
dc.date.accessioned	2014-03-01T02:42:01Z
dc.date.available	2014-03-01T02:42:01Z
dc.date.issued	2001	en
dc.identifier.issn	1022-1360	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30725
dc.subject.classification	Polymer Science	en
dc.subject.other	copper	en
dc.subject.other	metal derivative	en
dc.subject.other	nickel	en
dc.subject.other	polyvinylchloride	en
dc.subject.other	chemical composition	en
dc.subject.other	concentration response	en
dc.subject.other	conference paper	en
dc.subject.other	density	en
dc.subject.other	electric conductivity	en
dc.subject.other	environmental temperature	en
dc.subject.other	hardness	en
dc.subject.other	molecular model	en
dc.subject.other	particle size	en
dc.subject.other	powder	en
dc.subject.other	structure activity relation	en
dc.title	Structure-dependent conductivity and microhardness of metal-filled PVC composites	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1002/1521-3900(200105)169:1<297::AID-MASY297>3.0.CO;2-Z	en
heal.identifier.secondary	http://dx.doi.org/10.1002/1521-3900(200105)169:1<297::AID-MASY297>3.0.CO;2-Z	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	Metal-filed composites of a commercial PVC (polyvinyl chloride) powder (mean particle size d(p) approximate to 100 microns) and a metal powder (mean particle size d(f) about 100 microns for copper, Cu, and about 10 microns for nickel, Ni) prepared by mechanical mixing in a ball mill, subsequent hot-pressing at 443 K and rapid cooling to 300 K, were characterized by the room-temperature measurements of electrical conductivity sigma density rho and microhardness H. The sudden jumps of about 17 orders of magnitude followed by a much slower growth up to the limiting filler fraction phi* on the log sigma vs. phi plots are the evidence for the onset of percolation transitions. at filler volume contents phi (cl) = 0.05 and 0.04 for PVC/Cu and PVC/Ni, respectively For both systems, the values of H exhibited an initial steep increase up to phi (c2) = 0.07, followed by an apparent plateau extending up to phi = 0.18. However, drastic differences in the patterns of composition dependence of H were observed at higher metal loadings, i.e., a continuous increase of H up to the leveling-off at phi for PVC/Cu, in contrast to a sudden drop of H at phi = 0.20 and subsequent slow increase for PVC/Ni. For both composites the apparent density rho ' of a polymer matrix remained the same as that of the neat PVC in the composition interval phi < 0.20, white at phi < 0.20 a precipitous drop of rho (1) was observed due to the formation of polymer-free voids between filler particles (crowding effect) as phi approaches phi*. The observed effects were analyzed in terms of a tentative model envisaging cross-overs from "dilute suspension regime" to "semi-dilute suspension regime" in the concentration range to phi (c1), to phi (c2), and from "semi-dilute suspension regime" to "concentrated suspension regime" above phi = 0.20. Different behavior in this latter regime was explained by intrinsic differences in the structure of conductive infinite clusters between mixtures of particles of about the same size (PVC/Cu) and of widely different sizes (PVC/Ni).	en
heal.publisher	WILEY-V C H VERLAG GMBH	en
heal.journalName	Macromolecular Symposia	en
dc.identifier.doi	10.1002/1521-3900(200105)169:1<297::AID-MASY297>3.0.CO;2-Z	en
dc.identifier.isi	ISI:000169827100035	en
dc.identifier.volume	169	en
dc.identifier.spage	297	en
dc.identifier.epage	306	en