Rheologica Acta

, 48:943

Rheological properties and percolation in suspensions of multiwalled carbon nanotubes in polycarbonate

  • Samaneh Abbasi
  • Pierre J. Carreau
  • Abdessalem Derdouri
  • Michel Moan
Original Contribution

DOI: 10.1007/s00397-009-0375-7

Cite this article as:
Abbasi, S., Carreau, P.J., Derdouri, A. et al. Rheol Acta (2009) 48: 943. doi:10.1007/s00397-009-0375-7

Abstract

This paper is concerned with several issues related to the rheological behavior of polycarbonate/multiwalled carbon nanotube nanocomposites. The composites were prepared by diluting a masterbatch of 15 wt.% nanotubes using melt-mixing method, and the dispersion was analyzed by SEM, TEM, and AFM techniques. To understand the percolated structure, the nanocomposites were characterized via a set of rheological, electrical, and thermal conductivity measurements. The rheological measurements revealed that the structure and properties were temperature dependent; the percolation threshold was significantly lower at higher temperature suggesting stronger nanotube interactions. The nanotube networks were also sensitive to the steady shear deformation particularly at high temperature. Following preshearing, the elastic modulus decreased markedly suggesting that the nanotubes became more rigid. These results were analyzed using simple models for suspensions of rod-like particles. Finally, the rheological, electrical, and thermal conductivity percolation thresholds were compared. As expected, the rheological threshold was smaller than the thermal and electrical threshold.

Keywords

Multiwalled carbon nanotubePolycarbonateSuspensionRheological percolationElectrical percolationThermal conductivity percolationFilled polymerStorage modulus

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Samaneh Abbasi
    • 1
  • Pierre J. Carreau
    • 1
  • Abdessalem Derdouri
    • 2
  • Michel Moan
    • 3
  1. 1.CREPEC, Department of Chemical EngineeringEcole Polytechnique MontrealMontrealCanada
  2. 2.CREPEC, Industrial Materials InstituteNational Research Council CanadaBouchervilleCanada
  3. 3.Université de Bretagne OccidentaleBrest cedex3France