Polymerization of higher α-Olefins using a C s-symmetry hafnium metallocene catalyst. Kinetics of the polymerization and microstructural analysis

Vasilios Kotzabasakis, Konstantinos Kostakis, Marinos Pitsikalis, Nikolaos Hadjichristidis*, David J. Lohse, Thomas Mavromoustakos, Constantinos Potamitis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The C s-symmetry hafnium metallocene [(p-Et 3Si)C 6H 4] 2C(2,7-di-tert-BuFlu) (C 5H 4)Hf(CH 3) 2 and tetrakis(pentafluorophenyl) borate dimethylanilinium salt ([B(C 6F 5) 4] -[Me 2NHPh] +) were used as the catalytic system for the polymerization of higher α-olefins (from hexene-1 to hexadecene-1) in toluene at 0 °C. The evolution of the polymerization was studied regarding the variation of the molecular weight, molecular weight distribution and yield with time. The effect of the monomer structure on the polymerization kinetics was established. The role of trioctylaluminum in accelerating the polymerization was investigated. 13C NMR spectroscopy was used to study the microstructure of the poly(α-olefins) by the determination of the pentad monomer sequences. The thermal properties of the polymers were obtained by differential scanning calorimetry, DSC. The results were discussed in connection with the polymer microstructure.

Original languageEnglish (US)
Pages (from-to)4314-4325
Number of pages12
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume47
Issue number17
DOIs
StatePublished - Sep 23 2009

Keywords

  • Glass transition
  • Kinetics
  • Metallocene catalyst
  • Microstructure
  • α-olefins

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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