Low Temperature Izod Impact Studies of Blends Based on Impact Grade Polypropylene and Ethylene-α-Octene Copolymer

Autor:	Bal Krishna, Vishal Das, Arvind Kumar Pandey
Rok vydání:	2008
Předmět:	Polypropylene Materials science Ethylene Polymers and Plastics Mechanical Engineering Izod impact strength test Plastomer chemistry.chemical_compound chemistry Mechanics of Materials Materials Chemistry Ceramics and Composites Copolymer Polymer blend Octene Composite material Melt flow index
Zdroj:	Journal of Reinforced Plastics and Composites. 28:2879-2888
ISSN:	1530-7964 0731-6844
DOI:	10.1177/0731684408094058
Popis:	With an aim to enhance low temperature impact strength, blends of PP-cp (Impact Grade PP) and metallocene-catalyzed plastomer (EXACT® ethylene-α-octene copolymer) were prepared using a co-rotating, intermeshing twin-screw extruder in 90 : 10, 80 : 20, 70 : 30, and 60 : 40 weight ratio. Rheological properties studied by Haake’ single-screw extruder with torque rheometer attachment and capillary die showed pseudoplastic melt behavior at 220°C in the shear rate range of 400—4000 s—1. Density and MFI determinations showed minimal change. Morphology studied by low voltage scanning electron microscope (LVSEM) of blend samples showed distinct biphasic blend morphology wherein PP-cp as continuous phase and plastomer as spherical domains (0.5—2 μm size) with stabilized distribution and dispersion. Izod impact strength of the blends at varied temperatures (23, 0, -10, -20, -30, and -40°C) showed substantial enhancement in low temperature impact strength compared to the base polymer (from 44 J/m in case of pure PP-cp to 539 J/m in case of 40% plastomer blend at -40°C).
Databáze:	OpenAIRE
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