Propylene Polymerization Behavior of Fluorinated Bis(phenoxy-imine) Ti Complexes with an MgCl2-Based Compound (MgCl2-Supported Ti-Based Catalysts)
✍ Scribed by Yasushi Nakayama; Junji Saito; Hideki Bando; Terunori Fujita
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 106 KB
- Volume
- 206
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
Summary: Fluorinated bis(phenoxy‐imine)Ti complexes 1–3 combined with MgCl~2~/i‐Bu~n~Al(OR)~3−n~ (MgCl~2~‐supported catalysts) were able to polymerize propylene in a living fashion at room temperature to provide slightly to highly syndiotactic poly(propylenes) (PPs) with extremely narrow distributions of molecular weight. These represent the first examples of MAO‐ and borate‐free group 4 metal‐based living catalysts. The supported complexes 2 and 3 formed PPs with higher syndiotacticity and T~m~'s than the corresponding homogeneous MAO‐activation systems (e.g., 3: rr 97%, T~m~ 155 °C; MAO activation: rr 93%, T~m~ 152 °C). The measured T~m~ of 155 °C represents the highest known T~m~ for syndiotactic PPs synthesized at room temperature.
Polymerization of propylene to poly(propylene) with supported Ti‐based catalysts.
imagePolymerization of propylene to poly(propylene) with supported Ti‐based catalysts.