Synthesis And Properties Of ABS Resin

ABS resin is acrylonitrile-butadiene-styrene copolymer with good strength. As one of the five synthetic resins, ABS have been widely used in various industrial fields because of their high impact resistance, good dimensional stability, thermoresistance, chemiresistance and good processability. Nowadays, there are many ways to prepare the ABS resins. But, the most widely used method is preparation the ABS manufacture involves the grafting of rubber seed latex with SAN.In this paper, part one, firstly, Poly-butadiene latex with different particle sizes was synthesized by emulsion polymerization. Secondly, series of the ABS impact modifiers were prepared by grafting styrene and acrylonitrile onto PB latex with different particle sizes by seeded emulsion polymerization. Thirdly, these modifiers were blended with SAN to prepare the ABS resins. These aimed to the studies on morphology and mechanical properties of the ABS resins. Part two, two ABS resins with different rubber particle size(large particle of1.0u m and small particle of300nm) were used to prepare ABS blends. Effects of the ratio of large particle and small.particle.on the mechanical properties of ABS blends were investigated when the rubber content was fixed as15weight percent. Deformation mechanism was discussed preliminarily. The conclusions are as follows:The conclusions of part one, the phase morphologies of ABS resins with the different rubber particle sizes were observed with transmission electron microscope (TEM). The rubber particle dispersed uniformly in ABS resins. When the particle size ranging from80nm to200nm, it breaks in a brittle manner; while the particle size ranging from200nm to400nm, it breaks in a ductile fracture manner.The conclusions of part two,two ABS resins with different rubber particle sizes (large particle of1.0μm and small particle of300nm) were used to prepare ABS blends. Effects of the mechanical properties, It found that the Izod impact strength and yield strength increased with decreasing the percent of Large particle; when the ratio of large particle and small particle was1/9, the Izod impact strength and yield strength were the highest. Synergistic effect of rubber particles of different sizes was found. Moreover, deformation mechanisms of ABS resins were also investigated.