Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 133, Issue 40, Pages -Publisher
WILEY-BLACKWELL
DOI: 10.1002/app.44068
Keywords
blends; morphology; mechanical properties
Categories
Funding
- Iran National Science Foundation (INSF) [92008345]
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In this study, a blend of polypropylene (PP) and two types of thermoplastic polyolefin elastomers (TPO) were prepared by melt mixing. The TPOs were either ethylene-or propylene-based copolymer. The mechanical response and morphology of the blends were investigated using tensile and impact tests and scanning electron microscopy technique. There was significant increase in the impact strength of the TPO-modified PP, which was an outcome of fine dispersion of TPO inclusions. In particular, the blends containing PP-based TPO exhibited dramatic enhancement in toughness energy as featured by a plastic deformation in tensile test. The brittle-tough transition had several deviations from theoretical models, in which generally the interparticle distance criterion was realized as a single parameter, only controlled the transition of brittle to tough behavior. Moreover, the brittle-tough transition in tensile and impact mode tests was not coincident in the blend with a broad distribution of interparticle distance. (C) 2016 Wiley Periodicals, Inc.
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