Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 67, Issue 5, Pages 922-928Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2006.02.037
Keywords
nanostructures; polymer-matrix composites (PMCs); electrical properties
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The results presented in this paper reveal the first evidence that two types of percolation thresholds can coexist in an insulator-conductor-system, the higher one attributed to a static and the lower one to a kinetic network formation process. Detailed measurements at concentrations above the statistical percolation threshold show a power law dependence of conductivity on filler concentration (with an exponent of 2.7) that is independent of the processing condition. A simplified model of percolated particles was developed in order to relate the sample conductivity to the contact resistance between individual particles embedded within a polymer matrix. Our results are compared with previous studies in order to correlate the contact resistance values to different materials and processing conditions. (c) 2006 Elsevier Ltd. All rights reserved.
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