[en] Structure and electrical properties of conducting polyethylene/graphite composites have been studied in relation to the preparation method, i.e. (i) the polymerization-filling technique (PFT), in which the polyolefinic chains are growing from the graphite surface, (ii) the slurry polymerization of ethylene in the presence of untreated graphite, and (iii) the mechanical blending of preformed polyethylene and graphite. The extent of the filler dispersion depends on the method used for the composite preparation. Moreover, the graphite particles can be oriented by the molding of the samples used for the measurement of the electrical properties. This orientation is as pronounced as the melt viscosity of polyethylene is low, this characteristic feature changing with the preparation method. These structural details have consequences on the electrophysical properties and the percolation threshold. Finally, the thermal dependence of the electrical resistivity has been studied.
Research center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry Materials science & engineering
Author, co-author :
Pluta, Miroslaw; Polish Academy of Sciences, Lodz, Poland > Center of Molecular and Macromolecular Studies
Alexandre, Michaël ; Université de Mons-Hainaut - UMH > Laboratory of Polymeric and Composite Materials (LPCM)
Blacher, Silvia ; Université de Liège - ULiège > Department of Applied Chemistry > Laboratory of Chemical Engineering
Dubois, Philippe ; Université de Mons-Hainaut - UMH > Department of Chemistry > Laboratory of Polymeric and Composite Materials (LPCM)
Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Metallocene catalyzed polymerization of ethylene in the presence of graphite. 2. Structure and electrical properties of the composites
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique Dow Europe, Terneuzen, The Netherlands The "Belgium-Poland Scientific and Technological Cooperation"
Commentary :
The authors acknowledge Polymer (Elsevier) for allowing them to archive this paper.