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Polymer blends based on polyolefin elastomer and polypropylene

✍ Scribed by Ana Lúcia N. Da Silva; Maria Inès B. Tavares; Daniel P. Politano; Fernanda M. B. Coutinho; Marisa C. G. Rocha

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
247 KB
Volume
66
Category
Article
ISSN
0021-8995

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✦ Synopsis

A new family of homogeneous polyolefin polymers that exhibit unique molecular and rheological properties designated polyolefin elastomers (POEs) are characterized by a narrow molecular weight and high degrees of comonomer distribution. Because these copolymers are often elastomeric in nature, one of the uses for these materials is as impact properties improver for brittle polymers such as polypropylene at low temperatures. In this work a study was carried out about the effectiveness of the polyethylene elastomer (POE) as an impact modifier for polypropylene in relation to the traditional modifier EPDM. In this study the flow properties of of the POE/PP and EPDM/PP blends were also evaluated. The blends were analyzed by solid-state 13 C nuclear magnetic resonance ( 13 C-NMR) spectroscopy, scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). The results showed that PEE/ PP and EPDM/PP blends present a similar crystalline behavior, which resulted in a similar mechanical performance of the blends, on the composition analyzed. It was also verified that the POE/PP blend presents lower torque values than the EPDM/PP blend, which indicates a better processability when POE is used as an impact modifier. ᭧ 1997

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