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The ac-electrical properties of graphytized and degraphytized carbon-blacks filled rubbers were investigated at room temperature in the frequency range 100 Hz-10 kHz. The volume fraction of the fillers varies from 15% to 60%. The observed conductivity for graphytized filled samples was found to be much higher than degraphytized filled samples. This behavior was interpreted in terms of the defective zones which were dramatically reduced by the graphytization process. The Voet model was applied for both categories of filled rubbers which exhibit two distinct mechanisms of electrical conduction depending on the filler concentration.
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Ramadin et al. (1995) studied this question.
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