Properties of isotactic polypropylene/atactic polypropylene blends

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High-molecular-weight atactic polypropylene (HMW-aPP) was used as the impact modifier in isotactic polypropylene (iPP). HMW-aPP (M (w) 315,000 g/mol) was made by using metallocene catalysts, and iPP/HMW-aPP blends were prepared in a twin-screw extruder. The effects of HMW-aPP on the crystalline morphology, and thermal and mechanical properties of iPP were investigated by polarizing microscopy, differential scanning calorimetry, a universal testing machine, and Izod impact tests. The crystallization temperature and crystallinity of the iPP/HMWaPP blends increased compared to that of pure iPP. The HMW-aPP acted as a diluent during the crystallization of the iPP/HMW-aPP blends. These diluent HMW-aPP molecules prevented entanglement of the iPP molecules, which facilitated the crystallization of iPP. The Izod impact strength of the iPP/HMW-aPP blends increased with increasing HMW-aPP content owing to the incorporation of the soft HMW-aPP into the hard iPP. The Izod impact strength of the iPP-80 blend dramatically increased by 680% compared to that of neat iPP.
Publisher
SPRINGER
Issue Date
2015-09
Language
English
Article Type
Article
Keywords

LOW-DENSITY POLYETHYLENE; CRYSTALLIZATION BEHAVIOR; MECHANICAL-PROPERTIES; COPOLYMER BLENDS; IMPACT PROPERTIES; PHASE MORPHOLOGY; MOLECULAR-WEIGHT; PARTICLE-SIZE; RUBBER BLENDS; SEBS BLENDS

Citation

MACROMOLECULAR RESEARCH, v.23, no.9, pp.809 - 813

ISSN
1598-5032
DOI
10.1007/s13233-015-3106-1
URI
http://hdl.handle.net/10203/205350
Appears in Collection
CBE-Journal Papers(저널논문)
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