engleski

Effect of Styrene-Butadiene-Styrene Block Copolymer on Dynamic- Mechanical Properties of High- Impact Polystyrene

For the selection of the polymer materials and polymer blends for various fields of applications, dynamic-mechanical properties, the primary viscoelastic functions as well as the stability of materials on different loads are very important. Since polymer materials are viscoelastic, their mechanical properties are dependent on temperature and time. The dynamic-mechanical properties of high-impact polystyrene, (PS-HI) and blends of PS-HI and styrene-butadiene-styrene block copolymer, (SBS) were investigated. In the conditions of dynamic-mechanical load, the investigated systems will have different behaviours due to the various content of the hard phase, polystyrene and soft phase, polybutadiene. The investigations were done by DMA analysis. The primary viscoelastic functions were determined. The influence of the constant stress on the strain and moduls at various temperatures was examined. The effects of the time on moduls changes was obtained by generated the master curves. The viscoelastic functions and the stability on the constant load, the changes on the moduls with time and temperature depend on the amount of polystyrene in examined copolymers and blends. This investigations give the possibility of predicting useful life time of materials.

Styrene-butadiene-styrene; dynamic - mechanical properties; high-impact polystyrene

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