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Keywords:

  • metallocene catalysts;
  • polypropylene;
  • statistical analysis;
  • UV–vis spectroscopy;
  • Ziegler–Natta polymerization

Abstract

Thumbnail image of graphical abstract

MgCl2-supported metallocene catalysts often show peculiar catalytic aspects, which are partially similar to both non-supported complexes and traditional Ziegler–Natta 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 Ziegler–Natta-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.