Document Type : Original research
Department of Polymer Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran, P.O.Box:71993-3
Department of Applied Researches, Chemical, Petroleum & Polymer Engineering Research Center, Shiraz Branch, Islamic Azad University, Shiraz, Iran
Faculty of Engineering, Iran Polymer and Petrochemical Institute, Tehran, Iran, P.O. Box: 14975-112
Varying amounts of a high molecular weight poly(1-hexene) (PH, Mv=1.7×10^6 Da) are substituted for EPDM in an iPP/iPP-g-MA/EPDM blend (weight ratio: 76:4:20) and mechanical properties as well as phase morphology of the blends are studied and compared. The results show that upon substituting the entire EPDM by PH, tensile strength at break increases from 18.7 to 21.1 MPa, elongation at break increases from 15.5% to 370.8%, and impact strength increases from 6.4 to 50.1 kJ.m-2. Dynamic mechanical thermal analysis (DMTA) of the blends proves immiscibility in them and SEM analysis corroborates these findings by showing droplet-matrix morphologies. Studying the creep behavior of the samples shows that the blends containing PH have more creep such that by substituting all of EPDM in the blends by PH the permanent deformation increases from 0.425% to 0.505%. According to the results, PH is introduced as a candidate for improving impact properties of iPP/iPP-g-MA/EPDM blend.