Comparative Study of Distribution of Active Sites According to Their Stereospecificity in Propylene Polymerization over the Traditional TiCl3 and Supported Titanium–Magnesium Catalysts with Different Composition

Marina Nikolaeva, Mikhail Matsko, Vladimir Zakharov

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1 Citation (Scopus)

Abstract

The preparative-temperature rising elution fractionation method is used to obtain comparative data on contents of fractions with different microtacticities for polypropylene (PP) samples prepared using three catalytic systems: the traditional Ziegler–Natta (Z–N) catalyst δ-TiCl3 and two types of supported titanium–magnesium catalysts: the “donor-free” TiCl4/MgCl2 catalyst and TiCl4/MgCl2·nDBP catalyst (DBP – dibutylphthalate used as an internal donor) at polymerization with the same cocatalyst (AlEt3) in the absence and presence of an external donor (propyltrimetoxy silane). The separated individual PP fractions are also studied by gel permeation chromatography (molecular weight and molecular weight distribution) and differential scanning calorimetry. The results demonstrate general regularities and differences in the formation of active sites having different isospecificities for the traditional TiCl3-based Z–N catalyst and highly active supported titanium–magnesium catalysts.

Original languageEnglish
Article number1700488
Number of pages9
JournalMacromolecular Chemistry and Physics
Volume219
Issue number5
DOIs
Publication statusPublished - 1 Mar 2018

Keywords

  • fractionation of polymers
  • molecular weight distribution/molar mass distribution
  • poly(propylene) (PP)
  • Ziegler–Natta polymerization
  • Ziegler-Natta polymerization
  • MICROSTRUCTURAL ANALYSIS
  • ZIEGLER-NATTA CATALYST
  • molar mass distribution
  • molecular weight distribution
  • DONORS
  • HYDROGEN
  • RISING ELUTION FRACTIONATION
  • KINETICS

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