Premium
Morphology and properties of PP/EPDM binary blends and PP/EPDM/nano‐CaCO 3 ternary blends
Author(s) -
Gong Lei,
Yin Bo,
Li Lanpeng,
Yang Mingbo
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.34536
Subject(s) - materials science , crystallinity , differential scanning calorimetry , crystallization , polypropylene , polymer blend , epdm rubber , ternary operation , composite material , extrusion , scanning electron microscope , chemical engineering , ethylene propylene rubber , polymer chemistry , copolymer , polymer , natural rubber , physics , computer science , engineering , thermodynamics , programming language
In this article, the morphology, crystallization, and rheological behaviors of polypropylene (PP)/ethylene‐propylene‐diene terpolymer (EPDM) binary blend and PP/EPDM/calcium carbonate nanoparticles (nano‐CaCO 3 ) ternary blend were investigated. Two processing methods, i.e., direct extrusion and two‐step extrusion, were employed to prepare the PP/EPDM/CaCO 3 blend. The influence of EPDM and nano‐CaCO 3 respectively on phase morphology and properties of PP/EPDM blend and PP/EPDM/CaCO 3 blend were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and dynamic rheometer. The crystallinity and crystallization temperature of PP/EPDM blend were improved in comparison to pure PP due to addition of EPDM, but kept invariable with the increased EPDM loading. As the EPDM content was increased, the mobility of PP molecular chains was weakened. Compared with direct extruded blend, less and finer nano‐CaCO 3 was dispersed in matrix of two‐step extruded blend. Accordingly, the increased nano‐CaCO 3 in matrix gave rise to a weaker increment in crystallinity and crystallization temperature of two‐step extruded blend, and a later platform of tanδ curve. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011