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Achieving electrical percolation in polymer-carbon nanotube composites

Published online by Cambridge University Press:  01 February 2011

Sameer S. Rahatekar ,
M. Hamm ,
Milo S. P. Shaffer  and
James A. Elliott
Sameer S. Rahatekar
Affiliation:
Macromolecular Materials Laboratory, Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge, CB2 3QE
M. Hamm
Affiliation:
Macromolecular Materials Laboratory, Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge, CB2 3QE
Milo S. P. Shaffer
Affiliation:
Department of Chemistry, Imperial College, South Kensington, London, SW7 2AZ, UK.
James A. Elliott
Affiliation:
Macromolecular Materials Laboratory, Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge, CB2 3QE
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Abstract

The addition of carbon nanotubes (CNTs) to a polymer matrix is expected to yield improvements in both mechanical and electrical properties. The focus of this paper is to give a snapshot of our current work on CNT-filled thermoplastic polymer textile fibers and the enhancement of their electrical properties. The challenge is to determine the type and size of nanotubes that are most effective for a given application, and how they should be dispersed or modified to interact with the polymer. The objective of this work is to develop an understanding of how the processing methods and properties of nanotube polymer composites are related to the geometry of the nanotubes used, their orientation, and their loading fraction. It will then be possible to design desired composite properties by controlling the relevant process variables.

The research described in this paper primarily involves mesoscale simulations (dissipative particle dynamics) of packed assemblies of oriented CNTs suspended in a polymer matrix. Computer simulations have been carried out to study the effect of processing conditions, aspect ratio of CNTs and effect of electric field on electrical conductivity. The percolation threshold required to achieve an electrically conductive polymer-CNT fiber can be predicted for given set of process variables. The model predictions are compared with the predictions of classical percolation theory, and with experimental data from measurements of bulk resistivity from CNTs dispersed in thermoplastic polymers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 788: Symposium L – Continuous Nanophase and Nanostructured Materials , 2003 , L5.8
Copyright
Copyright © Materials Research Society 2004

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References

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