Melt Viscosities and Mechanical Properties of PC/SAN Blends

摘要

Melt viscosities and mechanical properties of polycarbonate(PC),styrene-acrylonitrile copolymer (SAN),and their blends were studied.PC and SAN were melt blended at different compositions using a single screw extruder.Melt viscosities were measured with a capillary rheometer.The melt viscosity test showed that increasing the PC content increases the viscosity of the blends,and melt viscosities of blends are intermediate be tween the values of PC and SAN.Standard mechanical property tests were performed on injection molded ASTM test speciments.Tensile strength and modulus increase but elongation at break decreases when the SAN content increases.Notched Izod impact strength decreases rapidly with the addition of SAN into PC.Unnotched impact strength is higher than notched impact strength and is less sensitive to the addition of SAN.