Two percolation thresholds in carbon nanotube epoxy composites

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 stati...

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Bibliographic Details
Published in:Composites science and technology 2007-04, Vol.67 (5), p.922-928
Main Authors: Kovacs, Josef Z., Velagala, Bala S., Schulte, Karl, Bauhofer, Wolfgang
Format: Article
Language:English
Subjects:
A. Nanostructures
A. Polymer-matrix composites (PMCs)
Applied sciences
B. Electrical properties
Composites
Exact sciences and technology
Forms of application and semi-finished materials
Polymer industry, paints, wood
Technology of polymers
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Summary: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.
ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2006.02.037