Study On Preparation And Properties Of Dynamically Vulcanized ABS/SBR Blends

With the development of polymer processing equipment and technology, more and more blends can be processed by dynamic vulcanization to produce a series of new polymer blends with excellent performance and wide application. In this paper, ABS/SBR blends were prepared through dynamic vulcanization and the properties were studied.ABS/SBR blends were melted by twin-screw extruder and processed by dynamic vulcanization with sulfur compounds curing system, organic peroxide curing system and phenolic resin curing system to make the rubber phase crosslinked, so as to improve the material’s strength and rigidity.The effect of different rubber ratio on melt flow rate, heat resistance and mechanical properties of ABS/SBR blends were studied through melt flow rate instrument, electronic universal testing machine, thermal deformation VEKA softening test machine,scanning electron microscopy (SEM) and other performance test method.The best curing system and the optimal amount of additives were determined. The results show that:With the increase of SBR content in ABS/SBR blends, the melt flow rate and the tensile strength decreased,the notched impact strength increased.When SBR content was 10 phr, the melt flow rate decreased slightly and the other performances were relatively stable.The blends processed with sulfur compounds curing system had higher hardness. With the increase of TMTD content, the thermal deformation temperature increased, tensile strength and notched impact strength increased first and then decreased. The optimal dosage of TMTD was 0.4 phr.The blends processed with organic peroxide curing system has better processing fluidity.When BPO and TAIC content were 0.2 phr and 0.3 phr respectively,the blends had the best comprehensive performances.The blends processed with phenolic resin curing system had the best tensile strength and notched impact strength and the highest thermal deformation temperature, so this system was seclected to be the optimal vulcanization system. The optimal dosage of tert-butyl phenol resin and SnCl2·2H2O were 1 phr and 0.8 phr respectively. The ABS/SBR blends with the ratio of 80/20 were cured by phenolic resin curing system. The optimum amount of tert-butyl phenolic resin was 1.2 phr.