Abstract
Microwave dielectric properties of closed cell microcellular EPDM rubber in shortcircuited wave-guide method have been studied at 9.69 GHz. Plots of dielectric constant (ε') with volume fraction of rubber shows a nonlinear relationship for both unfilled and silica filled microcellular rubbers obeying Weiner's inequalities. Several empirical relations have been tried to obtain a good fit. But for the solid vulcanizates other experimental values or points found to give a good fit. However the experimental fit found to deviate from the original empirical relation. A better fit was obtained for a proposed modified empirical relation suggested.
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