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  4. Two percolation thresholds in carbon nanotube epoxy composites
 
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Two percolation thresholds in carbon nanotube epoxy composites

Citation Link: https://doi.org/10.15480/882.266
Publikationstyp
Preprint
Date Issued
2006
Sprache
English
Author(s)
Lott, Josef-Zoltan  
Velagala, Bala S.  
Schulte, Karl  
Bauhofer, Wolfgang  
Institut
Optische und Elektronische Materialien E-12  
Kunststoffe und Verbundwerkstoffe M-11  
TORE-DOI
10.15480/882.266
TORE-URI
http://tubdok.tub.tuhh.de/handle/11420/268
Journal
Composites science and technology  
Start Page
922
End Page
928
Citation
Composites Science and Technology Volume 67, Issue 5, April 2007, Pages 922-928
Publisher DOI
10.1016/j.compscitech.2006.02.037
Scopus ID
2-s2.0-33846291747
Publisher
Elsevier
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.
Subjects
Carbon nanotubes
Epoxy matrix
Electrical properties
Percolation
Network formation
DDC Class
530: Physik
Lizenz
http://doku.b.tu-harburg.de/doku/lic_ohne_pod.php
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