Styrene Polymerization Behavior of Phenoxy−Imine Ligated Ti Complexes/MAO: Formation of Highly Isotactic and Syndiotactic PS

Unique styrene polymerization behavior of bis(phenoxy−imine) Ti complexes (Ti−FI catalysts) combined with dried MAO (DMAO) was revealed. Upon activation with DMAO at 20 °C, non-fluorinated Ti−FI catalysts 1 and 2 produce highly syndiotactic polystyrene (sPS, T m 275 °C (1), 279 °C (2)), whereas fluo...

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Veröffentlicht in:	Macromolecules 2008-09, Vol.41 (17), p.6289-6291
Hauptverfasser:	Michiue, Kenji, Onda, Mitsuhiko, Tanaka, Hidetsugu, Makio, Haruyuki, Mitani, Makoto, Fujita, Terunori
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Exact sciences and technology Organic polymers Physicochemistry of polymers Polymerization Preparation, kinetics, thermodynamics, mechanism and catalysts
Online-Zugang:	Volltext
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Zusammenfassung:	Unique styrene polymerization behavior of bis(phenoxy−imine) Ti complexes (Ti−FI catalysts) combined with dried MAO (DMAO) was revealed. Upon activation with DMAO at 20 °C, non-fluorinated Ti−FI catalysts 1 and 2 produce highly syndiotactic polystyrene (sPS, T m 275 °C (1), 279 °C (2)), whereas fluorinated Ti−FI catalysts 3 and 4 form highly isotactic PS (iPS, T m 224 °C (3), 213 °C (4)). Interestingly, the fluorinated Ti−FI catalysts can produce an iPS/sPS mixture by varying polymerization conditions.
ISSN:	0024-9297 1520-5835
DOI:	10.1021/ma8014118