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Characterization and properties of polypropylene‐ block ‐poly(ethylene‐ co ‐propylene) synthesized by short‐period polymerization
Author(s) -
Nitta KohHei,
Kawada Takenori,
Prokhorov Valery V.,
Yamahiro Mikio,
Mori Hideharu,
Terano Minoru
Publication year - 1999
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/(sici)1097-4628(19991024)74:4<958::aid-app22>3.0.co;2-7
Subject(s) - tacticity , copolymer , materials science , polypropylene , polymer chemistry , differential scanning calorimetry , ethylene propylene rubber , glass transition , polymerization , dynamic mechanical analysis , electron paramagnetic resonance , induction period , polymer , composite material , chemistry , catalysis , organic chemistry , nuclear magnetic resonance , physics , thermodynamics
The morphology and mechanical properties of novel block copolymers consisting of isotactic polypropylene (PP) and ethylene–propylene rubber (EPR) synthesized by a short‐period polymerization method were examined using differential scanning calorimetry, atomic force microscopy, dynamic mechanical analysis, and a rheooptical technique. It was found that the novel block copolymers show a single glass transition and EPR segments are trapped into the amorphous region of PP. Furthermore, the rheooptical analysis demonstrates that a drawing process of the EPR‐rich block copolymer induces orientation of the PP lamellae in the EPR matrix. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 958–964, 1999