Electrical conduction of graphite filled high density polyethylene composites; experiment and theory
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Disordered conductor–insulator composites exhibit a variety of phenomena, some of which have important commercial applications. Among large number of composite materials, conductive polymer composites have been extensively used in resistors, self regulating heaters, over current and over temperature circuit protection devices, antistatic materials, and materials for electromagnetic interference shielding. In order to analyze the conducting behavior in such systems on microscopic scale, several models have been proposed, such as percolation theory , effective media theory as projected by Bruggeman , aggregate structure model which overcome the disadvantage of effective media theory , and McLachlan’s general effective medial (GEM) theory which combines most of the features of both percolation and effective media theory . GEM equation is an interpolation between Bruggeman’s symmetric and asymmetric theories. The format of equation is in the same mathematical form...
KeywordsCarbon Black Percolation Threshold HDPE UHMWPE Ultra High Molecular Weight Polyethylene
This research is financially supported under UGC project F. No. 32-41/2006 (SR), Government of India. The authors would like to thank Prof. D. Pental (Vice Chancellor) for permission to implement this project in Department of Physics, University of Delhi North Campus. Graphite India Ltd, Bangalore is gratefully acknowledged for providing graphite powder.