Electrical properties of filled silicone rubber
- 10 February 2000
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 12 (8), 1873-1897
- https://doi.org/10.1088/0953-8984/12/8/330
Abstract
Rubber materials for high-voltage outdoor applications have been studied. They were prepared as mixtures of silicone polymer with different concentrations of powdered aluminium trihydrate as a filler. The dielectric properties, *( ) = ´-i ´´, were measured at different temperatures using a low-frequency dielectric spectroscopy technique. Without any filler a classical interfacial relaxation was pronounced with dominating direct-current (dc) conduction in the losses, ´´. On increasing the concentration of filler, a low-frequency dispersion mechanism started to dominate the relaxation behaviour. On adding the filler, the dc conduction first decreased and then increased again after a certain concentration level was passed. This behaviour showed that the filler particles acted like scattering centres or traps for conduction when the concentration was low. As the concentration increased, the conductivity of the filler particles and of the interface (between the filler particles and the polymer matrix) started to dominate the conduction. Master curve shifts of the data showed an Arrhenius type of activation. The data were modelled by superposition of three different processes, Havriliak-Negami dipolar relaxation, dc conduction and low-frequency dispersion (hopping conduction) contributions, using a nonlinear least-squares fitting method.Keywords
This publication has 19 references indexed in Scilit:
- Complex effective permittivity of a lossy composite materialJournal of Applied Physics, 1996
- The electrical conductivity of binary disordered systems, percolation clusters, fractals and related modelsAdvances in Physics, 1990
- Optical properties of a small-particle compositePhysical Review B, 1984
- Bounds on the complex permittivity of a two-component composite materialJournal of Applied Physics, 1981
- The dielectric constant of a simple cubic array of identical spheresJournal of Physics C: Solid State Physics, 1979
- The physical properties of composite materialsJournal of Materials Science, 1976
- Generalized approach to multiphase dielectric mixture theoryJournal of Applied Physics, 1973
- The Maxwell-Wagner-Sillars effect, describing apparent dielectric loss in inhomogeneous mediaPhysica, 1960
- Berechnung verschiedener physikalischer Konstanten von heterogenen Substanzen. I. Dielektrizitätskonstanten und Leitfähigkeiten der Mischkörper aus isotropen SubstanzenAnnalen der Physik, 1935
- Erklärung der dielektrischen Nachwirkungsvorgänge auf Grund Maxwellscher VorstellungenElectrical Engineering, 1914