ON THE CARBON-BLACK DISTRIBUTION IN CRYSTALLIZING POLYOLEFINS AND THEIR ELECTRICAL-CONDUCTIVITY

The possibility of redistribution of a filler into the interspherulite regions of a polymer in conditions of crystallization of a polymer medium has been studied from the temperature dependence of electrical resistance of polyolefines filled with carbon black and the absence of this redistribution has been shown. The changes of electrical conductivity of compositions are explained from the view-point of fracture and reduction of the secondary network structure of carbon black in the polyolefine melt. Viscosity of the polymer matrix is shown to be a property mainly affecting the rate of reduction of the secondary structure of carbon black.