The Dependence of the Dielectric Properties of Particulate Blend on the Step Crosslinking Process | ||||
| Egyptian Journal of Solids | ||||
| Article 11, Volume 27, Issue 2, 2004, Page 275-284 PDF (100.03 K) | ||||
| DOI: 10.21608/ejs.2004.149852 | ||||
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| Abstract | ||||
| The dielectric properties of styrene butadiene rubber (SBR) loaded with fast extrusion furnace black (FEF) samples crosslinked with sulfur via step crosslinking process were studied. The measurements were performed in the frequency range from 102 to 105 Hz at room temperature, and macroscopic permittivity έ describing the dielectric properties of the samples was evaluated. Extension of logarithmic law of mixtures enables equations to be formulated which describe the dielectric behavior of particulate polymeric composite containing conductive particles. These equations give the dielectric constant and dielectric loss of the composite as a function of the dielectric constant of the polymeric matrix, the volume fraction and the aspect ratio of the inclusions, and the frequency of the applied field. Equations proposed by Tsangaris et al were tested and modified with the experimental data over a wide range of frequencies and the step crosslinking process. Satisfactory agreement was observed taking into account the variation of the aspect ratio with the volume fraction of the FEF black in the NR matrix and also with the partial time of vulcanization process. | ||||
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