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

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• 作者：Kenji Michiue ; Mitsuhiko Onda ; Hidetsugu Tanaka ; Haruyuki Makio ; Makoto Mitani ; Terunori Fujita
• 刊名：Macromolecules
• 出版年：2008
• 出版时间：September 9, 2008
• 年：2008
• 卷：41
• 期：17
• 页码：6289-6291
• 全文大小：77K
• 年卷期：v.41,no.17(September 9, 2008)
• ISSN：1520-5835

文摘

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.