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Comparison of the Polymerization of Propene by Homogeneous and Heterogeneous Metallocene/MAO‐Catalysts under Different Polymerization Conditions
Author(s) -
Arrowsmith David,
Kaminsky Walter,
Laban André,
Weingarten Ulrich
Publication year - 2001
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 - 10.1002/1521-3935(20010701)202:11<2161::aid-macp2161>3.0.co;2-j
Subject(s) - methylaluminoxane , metallocene , polymerization , propene , polymer chemistry , toluene , chemistry , catalysis , post metallocene catalyst , zirconium , polymer , organic chemistry
Propene was polymerized using rac ‐dimethylsilylbis(2‐methyl‐4‐(1‐naphtyl)indenyl)zirconium dichloride ( rac ‐[Me 2 Si(2‐Me‐4‐(1‐Naphtyl)Ind) 2 ]ZrCl 2 ) under six sets of conditions: in toluene solution, bulk, toluene slurry, bulk with the supported metallocene, a stirred bed with polyethene and a stirred bed with NaCl. The first two procedures were carried out with methylaluminoxane (MAO) as cocatalyst, the latter four were performed with methylaluminoxane supported on silicagel (MAO/SiO 2 ) as activator. The differences between the procedures employed were examined by comparison of the polymer properties of the resulting products and of the activities at different temperatures. The polymerization procedure has a significant influence on the products. The polypropenes obtained with the homogeneous catalyst systems have generally high melting points and molar masses and exhibit very high activities. The heterogeneous analogues, on the other hand, gain enhanced stability by supporting, even at higher temperatures.