Dual-Active-Site Nature of Magnesium Dichloride-Supported Cyclopentadienyl Titanium Chloride Catalysts Switched by an Activator in Propylene Polymerization

作者：Goto Keisuke; Taniike Toshiaki; Terano Minoru^*

来源：Macromolecular Chemistry and Physics, 2013, 214(9): 1011-1018.

DOI：10.1002/macp.201200662

• metallocene catalysts
• polypropylene
• statistical analysis
• UVvis spectroscopy
• ZieglerNatta polymerization

MgCl2-supported metallocene catalysts often show peculiar catalytic aspects, which are partially similar to both non-supported complexes and traditional ZieglerNatta catalysts. In this study, the active-site natures of various MgCl2-supported cyclopentadienyl Ti chloride catalysts are systematically investigated and compared with traditional catalysts in propylene polymerization. The supported titanocene catalysts offer both metallocene-type and ZieglerNatta-type active-site natures according to the details of the preparation and the activation procedures. The observed dual-active-site natures are plausibly correlated with the valence and charge states of the Ti center.

• 出版日期2013-5-14