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Effect of percolation on electrical and dielectric properties of acrylonitrile butadiene styrene/graphite composite
Author(s) -
Dahiya H. S.,
Kishore Nawal,
Mehra R. M.
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26896
Subject(s) - materials science , percolation threshold , percolation (cognitive psychology) , dielectric , composite material , graphite , acrylonitrile butadiene styrene , conductivity , composite number , percolation theory , compression molding , dissipation factor , electrical resistivity and conductivity , chemistry , electrical engineering , mold , optoelectronics , neuroscience , biology , engineering
Abstract Prelocalized Acrylonitrile Butadiene Styrene/graphite composites were prepared by hot compression molding technique. The increased conductivity with increase of graphite content exhibits percolation phenomenon. The current–voltage characteristics are found to change from nonlinear to linear above the percolation threshold. A positive temperature coefficient of resistance is observed in these composites, and this effect is more pronounced in samples having graphite concentration near percolation threshold. The dielectric constant was found to increase slowly up to the percolation concentration and beyond it a sudden increase in its value is observed. The dissipation factor exhibits maxima in the vicinity of percolation threshold. The dielectric properties are discussed in terms of the interfacial Maxwell‐Wagner effects. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007