Polypropylene modified with elastomeric metallocene-catalyzed polyolefin blends: Fracture behavior and development of damage mechanisms
Laura A. Fasce
División Polímeros, Instituto de Investigaciones en Ciencia y Tecnología de Materiales, Avenida J.B. Justo 4302, 7600, Mar del Plata, Argentina
Search for more papers by this authorCorresponding Author
Patricia M. Frontini
División Polímeros, Instituto de Investigaciones en Ciencia y Tecnología de Materiales, Avenida J.B. Justo 4302, 7600, Mar del Plata, Argentina
División Polímeros, Instituto de Investigaciones en Ciencia y Tecnología de Materiales, Avenida J.B. Justo 4302, 7600, Mar del Plata, ArgentinaSearch for more papers by this authorShing-Chung Wong
School of Materials Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798
Search for more papers by this authorYiu-Wing Mai
Center for Advanced Materials Technology, School of Aerospace, Mechanical, and Mechatronic Engineering J07, University of Sydney, Sydney, NSW 2006 Australia
Search for more papers by this authorLaura A. Fasce
División Polímeros, Instituto de Investigaciones en Ciencia y Tecnología de Materiales, Avenida J.B. Justo 4302, 7600, Mar del Plata, Argentina
Search for more papers by this authorCorresponding Author
Patricia M. Frontini
División Polímeros, Instituto de Investigaciones en Ciencia y Tecnología de Materiales, Avenida J.B. Justo 4302, 7600, Mar del Plata, Argentina
División Polímeros, Instituto de Investigaciones en Ciencia y Tecnología de Materiales, Avenida J.B. Justo 4302, 7600, Mar del Plata, ArgentinaSearch for more papers by this authorShing-Chung Wong
School of Materials Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798
Search for more papers by this authorYiu-Wing Mai
Center for Advanced Materials Technology, School of Aerospace, Mechanical, and Mechatronic Engineering J07, University of Sydney, Sydney, NSW 2006 Australia
Search for more papers by this authorAbstract
The fracture behavior and deformation mechanisms of polypropylene modified by elastomeric metallocene-catalyzed polyolefin blends were investigated under both static and dynamic loading conditions. The fracture toughness was evaluated with the J integral approach. The development of damage mechanisms was studied by the examination of fracture surfaces with scanning electron microscopy and by the examination of single-edge, double-notch, four-point-bending or low-impact-energy fractured samples with optical microscopy. In addition, tensile dilatometry measurements were carried out to determine the nature of the deformation micromechanisms. The fracture behavior and the size and shape of the damage zones were drastically influenced by the elastomeric particles and the imposed constraint. The role of the elastomeric particles was different, depending on the strain rate. Under impact loading, particle pullout and crazing were responsible for the increased fracture toughness of polypropylene. Under quasistatic loading, stable fracture growth was caused by particle cavitation, which promoted ductile tearing of polypropylene before failure continued in an unstable fashion via crazing. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 1075–1089, 2004
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