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In situ polyolefin alloys
Author(s) -
Cecchin Giuliano
Publication year - 1994
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19940780119
Subject(s) - polyolefin , materials science , copolymer , tacticity , propene , chemical engineering , viscosity , composite material , stiffness , ethylene , molar mass , matrix (chemical analysis) , polymer , polymer chemistry , catalysis , organic chemistry , chemistry , polymerization , layer (electronics) , engineering
through sequential copolymerization of appropriate ethylene‐propene mixtures into a preformed polypropene, or sligthly modified polypropene matrix (PP), it was possible to achieve and optimize some important property balances of the resulting multiphase copolymers, by finely tuning both the nature of the various phases and their volume and viscosity ratios. Thus, optimum stiffness/impact strength was achieved acting on the stereoregularity and molar mass distribution (MMD) of the polypropene matrix; transparency/impact strength by adjusting heterophase to matrix viscosity or density ratios and, finally, softness/transparency by generating large concentrations of highly amorphous ethylene‐propene bipolymers (EPM).