NETWORKING OF CARBON-BLACK IN POLYMERS IN THE PRESENCE OF AN INTERFACE

An attempt has been made to study the cause of the increased electrica l conductivity of heterogeneous mixtures of polyethylene and ethylene- vinylacetate copolymer with various polymers. Using the data of electr ical conductivity measurements of polymer mixtures during the formatio n of phase boundary it is proposed that superadditive conductivity in mixtures under consideration is due to the presense of the loosened po lymer layer along the interface, The existence of such a layer had bee n shown previously. Increased mobility of macromolecules and carbon bl ack particles within the loosened layer favours the formation of more perfect conducting network of carbon black.