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Dielectric properties of conducting polymer

journal contribution
posted on 01.01.1994, 00:00 authored by V Truong, A Codd, Maria ForsythMaria 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, epsiprime, and imaginary part, epsiPrime, of the permittivity and loss tangent, tandelta, 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 delta ranging from 0.7–1.1 were achieved for the PPy powder (15 parts)/silicone rubber composites where a conducting network was observed.

History

Journal

Journal of materials science

Volume

29

Issue

16

Pagination

4331 - 4338

Publisher

Springer

Location

New York, N.Y.

ISSN

0022-2461

eISSN

1573-4803

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1994, Chapman & Hall

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