EFFECT OF ULTRASOUND ON CONDUCTIVITY OF POLYMERIC COMPOSITES

The mechanism of the influence of ultrasound (US) field on conductive properties of filled polymeric materials based on poly(dimethylmethyls iloxan) and polypropylene was investigated at room temperature and abo ve up to 80 degrees C. It has been shown, that the effect of US on the conductivity of composites essentially depends on such factors as den sity of crosslinked bonds, concentration and type of fillers, degree o f crystallinity and interaction between polymer and filler. It is foun d that composites conductivity decreases as US power increases because of the increase in intensivity of Brownian motion of filler particles . This motion is connected with segmental movement of macromolecules w hich essentially depends on the character of macromolecular microstruc ture and the value of interaction between composites components.