Journal of Materials Science

, Volume 29, Issue 16, pp 4331–4338 | Cite as

Dielectric properties of conducting polymer composites at microwave frequencies

  • V. -T. Truong
  • A. R. Codd
  • M. Forsyth


The dielectric properties of conducting polymer composites containing polypyrrole (PPy) crushed films, PPy powder, polyaniline (PAn) base and acid powders as the dispersants and silicone rubber and vinyl ester as matrix materials have been investigated in the frequency range 2-18 GHz. The dielectric parameters such as the real part, ε′, and imaginary part, ε″, of the permittivity and loss tangent, tanδ, increase with increasing conductivity and concentration of the dispersant. The geometrical shape of the dispersant governs the ability of conductive network formation which is indicated by a large drop in the resistivity of the composite. Also, dispersant/matrix interactions and physical properties of the matrix influence the agglomeration of the dispersant phase which, in turn, affects the dielectric properties of the composites. Flakes of PPy obtained by crushing highly conductive films and large PAn powder aggregates were unable to form a conducting network. The composites without a network of dispersant exhibit low dielectric parameters. On the other hand, high values of tan δ ranging from 0.7–1.1 were achieved for the PPy powder (15 parts)/silicone rubber composites where a conducting network was observed.


Polyaniline Dielectric Property Loss Tangent Polypyrrole Silicone Rubber 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • V. -T. Truong
    • 1
  • A. R. Codd
    • 1
  • M. Forsyth
    • 1
  1. 1.DSTO Aeronautical and Maritime Research LaboratoryMelbourneAustralia

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