Propylene polymerization over supported Ziegler-Natta catalysts: Effect of internal and external donors on distribution of active sites according to stereospecificity

Marina Nikolaeva, Mikhail Matsko, Vladimir Zakharov

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Data on the content of fractions with different microtacticities for polypropylene (PP) samples produced over three catalysts [the "donor-free" titanium-magnesium catalyst and catalysts with dibutyl phthalate and 1,3-diether(fluorene) used as internal donors] upon polymerization in the absence/presence of an external donor (ED) have been obtained by preparative temperature rising elution fractionation method. The effect of internal and EDs on the distribution of PP fractions with different microtacticity is discussed. Data on molecular weight and thermophysical characteristics were obtained for individual fractions with different microtacticities. Correlations were found between microtacticity, molecular weight, and the melting points of these fractions.

Original languageEnglish
Article number46291
Number of pages10
JournalJournal of Applied Polymer Science
Volume135
Issue number23
DOIs
Publication statusPublished - 15 Jun 2018

Keywords

  • Catalysts
  • Polyolefins
  • Polypropylene
  • Separation techniques
  • Stereochemistry and tacticity
  • TREF-temperature rising elution fractions
  • separation techniques
  • polyolefins
  • catalysts
  • polypropylene
  • stereochemistry and tacticity
  • TITANIUM-MAGNESIUM CATALYSTS
  • CENTERS
  • ELECTRON-DONORS
  • HYDROGEN
  • POLYPROPYLENE
  • RISING ELUTION FRACTIONATION
  • PROPENE POLYMERIZATION
  • MICROSTRUCTURE

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