Polypropylene Blends with m-EPR Copolymers: Mechanical and Rheological Properties

Authors

  • Iztok Švab ISOKON, Production and Processing of Thermoplastics, Ltd, Mestni trg 5a, 3210 Slovenske Konjice, Slovenia
  • Anđela Pustak Ruđer Bošković Institute, Division of Materials Chemistry, Bijenička 54, 10002 Zagreb, Croatia
  • Matjaž Denac University of Maribor, FEB Maribor, Institute of Technology, Razlagova 14, 2000 Maribor, Slovenia
  • Andrijana Sever Škapin Slovenian National Building and Civil Engineering Institute, Department of Materials, Laboratory for polymers, Dimičeva 12, 1000 Ljubljana, Slovenia
  • Mirela Leskovac University of Zagreb, Faculty of Chemical Engineering and Technology, Savska 16, 10 000 Zagreb, Croatia
  • Vojko Musil University of Maribor, FEB Maribor, Institute of Technology, Razlagova 14, 2000 Maribor, Slovenia Faculty of polymer technology, Ozare 19, 2380 Slovenj Gradec, Slovenia
  • Ivan Šmit Ruđer Bošković Institute, Division of Materials Chemistry, Bijenička 54, 10002 Zagreb, Croatia

DOI:

https://doi.org/10.17344/acsi.2017.4026

Keywords:

isotactic polypropylene, metallocene ethylene-propylene-based elastomers, blends, mechanical properties, adhesion parameters

Abstract

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.

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Published

19.06.2018

Issue

Vol. 65 No. 2 (2018)

Section

Materials science

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