Two percolation thresholds in carbon nanotube epoxy composites

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 Vol. 67; no. 5; pp. 922 - 928
Main Authors: Kovacs, Josef Z., Velagala, Bala S., Schulte, Karl, Bauhofer, Wolfgang
Format: Journal Article Conference Proceeding
Language:English
Published: Oxford Elsevier Ltd 01-04-2007
Elsevier
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
A. Polymer-matrix composites (PMCs)
B. Electrical properties
A. Nanostructures
Electrical conductivity
Electrical properties
Epoxy resin
Carbon nanotubes
Electrical conduction
Experimental study
Modeling
Composite material
Concentration effect
Percolation
Nanocomposite
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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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2006.02.037