ELECTRICAL-PROPERTIES OF GRAPHYTIZED AND DEGRAPHYTIZED CARBON-BLACKS FILLED RUBBERS

The ac-electrical properties of graphytized and degraphytized carbon-b lacks filled rubbers were investigated at room temperature in the freq uency range 100 Hz-10 kHz. The volume fraction of the fillers varies f rom 15% to 60%. The observed conductivity for graphytized filled sampl es was found to be much higher than degraphytized filled samples. This behavior was interpreted in terms of the defective zones which were d ramatically reduced by the graphytization process. The Voet model was applied for both categories of filled rubbers which exhibit two distin ct mechanisms of electrical conduction depending on the filler concent ration.