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Multiple threshold percolation in polymer/filler composites

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dc.title Multiple threshold percolation in polymer/filler composites en
dc.contributor.author McQueen, Douglas
dc.contributor.author Jäger, Karl-Michael
dc.contributor.author Pelíšková, Michaela
dc.relation.ispartof Journal of Physics D: Applied Physics
dc.identifier.issn 0022-3727 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2004-08-07
utb.relation.volume 37
utb.relation.issue 15
dc.citation.spage 2160
dc.citation.epage 2169
dc.type article
dc.language.iso en
dc.publisher IOP Publishing, Ltd. en
dc.identifier.doi 10.1088/0022-3727/37/15/018
dc.relation.uri http://iopscience.iop.org/0022-3727/37/15/018/
dc.subject Carbon black en
dc.subject Cooling en
dc.subject Electric conductivity en
dc.subject Fillers en
dc.subject Materials science en
dc.subject Mathematical models en
dc.subject Percolation (solid state) en
dc.subject Permittivity en
dc.subject Polyethylenes en
dc.subject Polymethyl methacrylates en
dc.subject Power transmission en
dc.subject Shrinkage en
dc.subject Percolation threshold en
dc.subject Scaling laws en
dc.subject Composite materials en
dc.description.abstract Local variations in filler particle concentration and/or shape and orientation in static filler/polymer composites are modelled as distributions of percolation thresholds. The concentration variations can be due to insufficient mixing, formation of semicrystalline voids during cooling from the melt, shrinkage during polymer curing, flow during physical compression or the like. Irregular filler shapes, especially elongated shapes, reduce the percolation threshold; thus, natural variations in the shapes and orientations of filler particle aggregates lead to locally varying percolation thresholds. A distribution of percolation thresholds leads to an apparent average percolation threshold based on the conductivity below the mean percolation threshold. For filler concentrations above the apparent percolation threshold, the dielectric constant continues to increase before reaching a lowered peak value at the mean percolation threshold and then decreasing. This can explain some 'anomalous' published experimental results concerning the dielectric constant just above the percolation threshold. In the frequency plane, the percolation threshold distribution can lead to a slight reduction of the apparent critical exponents x and y of the frequency dependencies of the conductivity and relative dielectric constant, respectively. Our experimental results on ethylene butylacrylate copolymer/carbon black composites support the theory. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1002049
utb.identifier.scopus 2-s2.0-3843130640
utb.identifier.wok 000223510100018
utb.identifier.coden JPAPB
utb.source j-wok
dc.date.accessioned 2011-08-16T15:06:17Z
dc.date.available 2011-08-16T15:06:17Z
utb.contributor.internalauthor Pelíšková, Michaela
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