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Publisher DOI: 10.1016/j.compscitech.2006.02.037
Title: Two percolation thresholds in carbon nanotube epoxy composites
Language: English
Authors: Lott, Josef-Zoltan 
Velagala, Bala S. 
Schulte, Karl 
Bauhofer, Wolfgang 
Keywords: Carbon nanotubes;Epoxy matrix;Electrical properties;Percolation;Network formation
Issue Date: 2006
Publisher: Elsevier
Source: Composites Science and Technology Volume 67, Issue 5, April 2007, Pages 922-928
Journal or Series Name: Composites science and technology 
Abstract (english): 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.
DOI: 10.15480/882.266
Institute: Optische und Elektronische Materialien E-12 
Kunststoffe und Verbundwerkstoffe M-11 
Type: Preprint (Vorabdruck)
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