Creep relaxation and stress relaxation of PS-HI/SEBS blends |
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Authors: | Vesna Rek Tamara Holjevac Grgurić Želimir Jelčić |
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Affiliation: | 1. Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg19, Zagreb, Croatia;2. DIOKI d.o.o., Žitnjak bb., Zagreb, Croatia |
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Abstract: | 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 flexural relaxation modulus were investigated in creep and stress relaxation experiment at temperatures 25, 35, 45, 55 and 65°C during 1 h. The master curves were created by time-temperature correspondence principle, TTC. The correlation of the secondary viscoelastic functions with time, temperature and content of the hard, PS, phase was discussed. |
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Keywords: | creep dynamic-mechanical behavior high-impact polystyrene master curve PS-HI/SEBS blends stress relaxation styrene-ethylene/butylene-styrene block copolymer time-temperature superposition |
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