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Investigation of a fine‐grain MgCl 2 ‐supported Ziegler catalyst by stopped‐flow propene polymerization: Model for the formation of active sites induced by catalyst fragmentation during polymerization
Author(s) -
Mori Hideharu,
Yoshitome Masaki,
Terano Minoru
Publication year - 1997
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1997.021981018
Subject(s) - catalysis , polymerization , propene , polymer chemistry , active center , chemistry , grinding , ziegler–natta catalyst , fragmentation (computing) , melt flow index , materials science , polymer , organic chemistry , composite material , copolymer , computer science , operating system
A fine‐grain catalyst, as a model of catalyst fragmentation in the course of polymerization, was prepared by grinding an original MgCl 2 ‐supported Ziegler catalyst. In order to clarify the nature of the active sites generated after catalyst fragmentation, the kinetic parameters for propene polymerization with both catalysts were estimated using the stopped‐flow method. The active sites concentration of the fine‐grain catalyst was higher than that of the original MgCl 2 ‐supported catalyst, indicating that the grinding treatment induced the formation of new active sites. However, the propagation rate constant and stereoregularity of polypropene remained unaffected. This is an indication that the nature of the active sites formed after the grinding treatment was the same as that of active sites on the original MgCl 2 ‐supported catalyst.