Analytical study of the electrical behavior of carbon-black-filled polymeric materials

Summary form only given. The authors analyzed the behavior of electrical conductive materials containing acetylene black using heat cycles between room temperature and 90 degrees C. It was found that the degree of the change of conductivity is determined by the initial dispersion of carbon black, the crosslinking density, and the thermal expansion coefficient of the polymer matrix. Increasing the crosslinking density of the polymer suppressed the change of conductivity through the heat cycle. This phenomenon can be explained by the migration of carbon black through the polymer matrix becoming too difficult. In the case of a blended polymer matrix, it was revealed that the hard segment of the polymer matrix acted to minimize the change of electrical conductivity. These findings indicated that the small change of conductivity can be explained by the migration and coagulation of carbon black.<>