When the carbon black-filled rubbers are stretched, the electrical resistivity increases at lower extension ranges,
and then it decreases with further extension. This complex behavior is attributed to the morphology changes of carbon
black particles during extension, i.e., breaking and forming conducting paths.
In this study, highly conductive carbon blacks were compounded with high styrene content SBR matrix with
contents varying from 5phr, 10phr, 15phr and 20phr. All the compounds measured the electrical resistance at room
temp., 40°C, 80°C, respectively. The electrical resistances are decreased as the conductive carbon blacks are higher and
temperature is increased. The electrical resistivity and tensile behaviors were investigated as a function of stretching at
80°C. The conductive carbon black-filled a styrene-butadiene rubber vulcanizate showed much higher conductivity and
the electrical resistivity is more stable by increase of contents. In tensile behaviors, as the contents of conductive carbon
blacks increase, it shows the increase of strength.