engleski

Creep Relaxation and Stress Relaxation of PS-HI/SEBS Blends

For the selection of the polymer materials and polymer blends for various fields of applications the stability of material under constant deformation and constant load are very important. In this paper, the copolymers high impact polystyrene, PS-HI, styrene-ethylene/buthylene- styrene block copolymer, SEBS, and their blends PS-HI/SEBS were investigated. The investigations were done by DMA analysis. The secondary viscoelastic functions, creep, creep modulus, stress and flexurale relaxation modulus were investigated in creep and stress relaxation experiment at temperatures 25, 35, 45, 55 and 65 oC during 1 h. The master curves were created by time-temperature superposition principle. The correlation of the secondary viscoelastic functions with time, temperature and content of the hard, PS, phase was discussed.

dynamic- mechanical behaviour ; creep ; stress relaxation ; time temperature superposition ; master curve ; high- impact polystyrene ; styrene-ethylene/buthylene-styrene block copolymer ; PS-HI/SEBS blends

Glavni autori: Tamara Holjevac Grgurić, Vesna Rek