20.500.12556/DiRROS-17545 Polypropylene blends with m-EPR copolymers mechanical and rheological properties The effects of two metallocene ethylene-propylene-based elastomers (m-EPR1 and m-EPR2) differing in molecular mass and viscosity on mechanical, rheological and interfacial properties were compared. The m-EPR elastomers were added to iPP in 2.5, 5, 10, 15, and 20 vol.%. Torque values, elongation at break and impact strength measured of the iPP/m-EPR1 blends were higher than the iPP/m-EPR2 blends due to higher molten viscosity of m-EPR1 than m-EPR2 copolymer. Slight differences in Young moduli as well as in tensile strength at yield and at break might indicate that tensile properties of iPP/m-EPR blends were not significantly affected by difference in viscosity or molecular mass, miscibility and spherulite size. Optimization diagrams indicated the metallocene m-EPR copolymers are efficient impact modifiers for polypropylene and showed good balancing of mechanical properties in iPP/m-EPR blends. V delu smo preučevali vpliv dveh metalocenskih elastomerov na osnovi etilena/propilena (m-EPR1 in m-EPR2), ki sta se razlikovala v molekulski masi in viskoznosti, na mehanske, reološke in medpovršinske lastnosti. V iPP matrico smo dodali 2.5, 5, 10, 15 in 20 vol.% m-EPR elastomera. Ugotovili smo, da imajo mešanice iPP/m-EPR1 višje vrednosti torzijskega momenta mešanja, raztezka ob pretrgu in udarne žilavosti kot mešanice iPP/m-EPR2 zaradi višje viskoznosti taline m-EPR1 kot m-EPR2 elastomera. Manjše razlike v Youngovem modulu, meji plastičnosti in natezni trdnosti pri pretrgu kažejo, da natezne lastnosti mešanic iPP/m-EPR niso v veliki meri odvisne od viskoznosti ali molekulske mase, mešljivosti in velikosti sferolitov. Optimizirani diagrami kažejo, da so m-EPR elastomeri učinkoviti modifikatorji žilavosti za polipropilen in kažejo ugodno ravnotežje mehanskih lastnosti mešanic iPP/m-EPR. isotactic polypropylene metallocene ethylene-propylene-based elastomers blend mechanical properties adhesion parameters true false true Slovensko kemijsko društvo Angleški jezik Slovenski jezik © authors, 2018 Neznano 2023-12-13 08:10:34 2023-12-13 08:10:35 2023-12-14 03:36:38 0000-00-00 00:00:00 2018 0 0 Nasl. z nasl. zaslona; Opis vira z dne 30. 7. 2018; str. 344-353 no. 2 Vol. 65 2018 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2018-06-19 54 1580-3155 10.17344/acsi.2017.4026 2383719 https://journals.matheo.si/index.php/ACSi/article/view/4026 1 54bc0f61-997e-11ee-9ccb-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=23844 RAZ_Svab_Iztok_2018.pdf RAZ_Svab_Iztok_2018.pdf 1 AEBB58117213605B9E43B01EB93AF90E de68d10f1b678b6f84433faf4d0aed79bd0020e2cd5f10ff8eaaebbd5317330c 087df0b0-9980-11ee-9ccb-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=23845 Zavod za gradbeništvo Slovenije 0 0 0