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Propylene Polymerization Performance of Isolated and Aggregated Ti Species Studied Using a Well‐Designed TiCl 3 /MgCl 2 Ziegler‐Natta Model Catalyst
Author(s) -
Wada Toru,
Taniike Toshiaki,
Kouzai Iku,
Takahashi Shougo,
Terano Minoru
Publication year - 2009
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200900015
Subject(s) - natta , catalysis , polymerization , ziegler–natta catalyst , polymer chemistry , materials science , chemical engineering , chemistry , organic chemistry , polymer , engineering
Abstract In propylene polymerization with MgCl 2 ‐supported Ziegler‐Natta catalysts, it is known that the reduction of TiCl 4 with alkylaluminum generates Ti 3+ active species, and at the same time, leads to the growth of TiCl x aggregates. In this study, the aggregation states of the Ti species were controlled by altering the Ti content in a TiCl 3 /MgCl 2 model catalyst prepared from a TiCl 3 · 3C 5 H 5 N complex. It is discovered that all the Ti species become isolated mononuclear with a highly aspecific feature below 0.1 wt.‐% of the Ti content, and that the isolated aspecific Ti species are more efficiently converted into highly isospecific ones by the addition of donors than active sites in aggregated Ti species.