1. On the influence of nanotube properties, processing conditions and shear forces on the electrical conductivity of carbon nanotube epoxy composites.
- Author
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Josef Z Kovacs, Roman E Mandjarov, Thomas Blisnjuk, Kirsten Prehn, Martin Sussiek, Jorg Muller, Karl Schulte, and Wolfgang Bauhofer
- Subjects
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CARBON nanotubes , *ELECTRIC conductivity , *SHEAR (Mechanics) , *EPOXY compounds , *CHEMICAL kinetics , *PLASMA-enhanced chemical vapor deposition , *PERCOLATION , *COMPOSITE materials - Abstract
We analyse statistical and kinetic percolation thresholds and maximum electrical conductivities of carbon nanotube epoxy composites as a function of shear forces, processing conditions, nanotube type and dimensions. Entangled and non-entangled nanotubes of different lengths (15-100 um) and thicknesses (12-80 nm) have been obtained with three different synthesis methods based on catalytic or plasma enhanced chemical vapour deposition. The dispersions were processed either solely with a dissolver disk or additionally with a three roll calender. Care was taken to prevent unintentional shearing (e.g. through convection) in all samples that were not subject to deliberate shearing. It was found that shear forces have a similar influence on kinetic percolation thresholds and composite conductivities independent of nanotube types and dimensions. [ABSTRACT FROM AUTHOR]
- Published
- 2009
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