DISTRIBUTION OF CARBON-BLACK IN POLYETHYL ENE BLENDS WITH ETHYLENE-VINYL ACETATE COPOLYMERS

The distribution of carbon black between the phases of heterogeneous b lends of ethylene-vinyl acetate copolymers with one another and with p olyethylene was studied. in the course of mixing, a fraction of carbon black is partially transferred from the phase premixed with carbon to another, unfilled phase. The redistribution of carbon black is relate d to and quantitatively controlled by partial mutual solubility of the polymers. With an increase in mutual solubility of the polymers, the distribution of carbon black in the mixture becomes more uniform; this , in effect, reduces the electrical conductivity of the composite.