Processing and Dynamic Mechanical Properties of PS-HI/SEBS Blends

摘要

Thermoplastic elastomers have been successfully used as impact modifiers for thermoplastics. Dynamic mechanical properties and phase transitions are very important for their application. In this paper, the copolymers high-impact polystyrene, PS-HI, styrene-ethylene/butylene-styrene block copolymer, SEBS, and their blends PS-HI/SEBS were investigated. Rheological behaviour of those samples during processing was followed by measuring the torque vs. time in the extruder Haake Record 90. The investigations were done by DMA analysis. The primary viscoelastic functions, the storage modulus, E', the loss modulus, E, and loss tangent, tgδ, were determined in the temperature range -150°C to 160°C. The correlation of the processing parameters and primary viscoelastic functions with content of the hard, PS, phase were discussed.