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Multilayered core–shell structure of the dispersed phase in high‐impact polypropylene
Author(s) -
Chen Yong,
Chen Ye,
Chen Wei,
Yang Decai
Publication year - 2008
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.25410
Subject(s) - polypropylene , materials science , copolymer , scanning electron microscope , differential scanning calorimetry , transmission electron microscopy , polyethylene , polymer blend , phase (matter) , composite material , ethylene propylene rubber , polymer chemistry , chemical engineering , polymer , chemistry , nanotechnology , organic chemistry , physics , engineering , thermodynamics
The multiphase morphology of high impact polypropylene (hiPP), which is a reactor blend of polypropylene (PP) with ethylene–propylene copolymer, was investigated by transmission electron microscopy, selected area electron diffraction, atomic force microscopy, and field‐emission scanning electron microscopy techniques in conjunction with an analysis of the hiPP composition and chain structure based on solvent fractionation, 13 C‐NMR, and differential scanning calorimetry measurements. A multilayered core–shell structure of the dispersed phase of hiPP in solution‐cast films and the bulk was observed. The inner core was mainly composed of polyethylene (including its long blocks) together with part of PP, the intermediate layer was ethylene–propylene random copolymer, and the outer shell consisted of ethylene–propylene multiblock copolymers. The formation process and controlling factors of the multilayered core–shell structure are discussed. This kind of multiphase morphology of hiPP caused the material to possess both a high rigidity and high toughness. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008