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Dielectric properties of conducting polymer
journal contribution
posted on 1994-01-01, 00:00 authored by V Truong, A Codd, Maria ForsythMaria ForsythThe 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 scienceVolume
29Issue
16Pagination
4331 - 4338Publisher
SpringerLocation
New York, N.Y.Publisher DOI
ISSN
0022-2461eISSN
1573-4803Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
1994, Chapman & HallUsage metrics
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