Abstract: In this paper, the morphology and electrical conductivity of LDPE/CPE/carbon black composites were studied.It was shown that depending on the composition, the composites may show "sea-island"structure or dual-continuous phases interlocking structure.Above the blend ratio of LDPE/CPE= 50/50,the electrical conductivity of LDPE/CPE/carbon black composites is higher more than 2-5 orders of magnitude than that of LDPE/carbon black composites,which is mainly caused by the heterogeneous distribution of carbon black particles in the two incompatible polymer components,i.e. LDPE and CPE. This experimental result indicates that addition of an incompatible polymer to a polymer filled with carbon black can be a new method to increase the electrical conductivity of polymer composites.

Key words: LDPE/CPE/carbon black electrical conductive composites, "Sea-island"structure, "Interlock"structure, Heterogeneous distribution of carbon black particles