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Random ethene/propene copolymerization from a catalyst system based on a “constrained geometry” half‐sandwich complex
Author(s) -
Galimberti Maurizio,
Mascellani Nicoletta,
Piemontesi Fabrizio,
Camurati Isabella
Publication year - 1999
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/(sici)1521-3927(19990401)20:4<214::aid-marc214>3.0.co;2-a
Subject(s) - propene , methylaluminoxane , cyclopentadienyl complex , copolymer , catalysis , metallocene , reactivity (psychology) , polymer chemistry , materials science , polymerization , titanium , geometry , chemistry , mathematics , organic chemistry , composite material , polymer , medicine , alternative medicine , pathology , metallurgy
Ethene/propene copolymerizations were performed in solution with a single centre catalyst system composed of a “constrained geometry” half‐sandwich organometallic complex { η 1 : η 5 ‐[( tert ‐butylamido)dimethylsilyl](2,3,4,5‐tetramethyl‐1‐cyclopentadienyl)}titanium dichloride, and methylaluminoxane. The statistical treatment of polymerization data allowed to determine the reactivity ratios for ethene and propene: r E = 1.35 ± 0.09, r P = 0.82 ± 0.05, r E r P = 1.10 ± 0.14. This catalyst system promotes an almost random distribution of ethene and propene and gives rise to values of r P and r E very similar to each other.