Abstract: The effect of shearing stress in a twin screw extruder during melt extruding on the mechanical properties of acrylonitrile-butadiene-styrene copolymer/nitrile-butadiene ruber (ABS/NBR) blends was investigated. It was found that a higher shearing stress could accelerate the distribution of NBR particles in the ABS matrix and enhanced the interfacial bonding between NBR and ABS. At 220℃, when the screw speed increased from 240 to 1200r/min, the Izod impact strength of the blends (ABS/NBR=90/10) increased from 22.1 to 28.8kJ/m2.

Key words: nitrile-butadiene rubber, shearing stress, blending, mechanical property, acrylonitrile-butadiene-styrene copo1ymer, twin-screw extruder, screw speed