Controlled vinyl-type polymerization of norbornene with a nickel(II) diphosphinoamine/methylaluminoxane catalytic system

Georgios C. Vougioukalakis, Ioannis Stamatopoulos, Nikolaos Petzetakis, Catherine P. Raptopoulou, Vassilis Psycharis, Aris Terzis, Panayotis Kyritsis, Marinos Pitsikalis, Nikolaos Hadjichristidis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

A novel nickel-based complex coordinated with an asymmetric diphosphi-noamine ligand was synthesized and fully characterized. Single crystals of good quality were also obtained, and the solid-state structure of the complex was studied via X-rays diffraction. The catalytic activity of this Ni(II) complex in the vinyl-type polymerization of norbornene was studied with methylaluminoxane (MAO) as the cocatalyst/activator. The influence of the reaction time, the equivalents of MAO used, and the concentration of the monomer on: (i) the activity of the catalytic system; (ii) the isolated yield of the polymer; and (iii) the molecular weight and molecular weight distribution of the polymer were investigated. The isolated polynorbornene (PNB) yields are significantly higher compared with those reported for other similar nickel-based systems. The as-obtained PNBs are characterized by high molecular weights and relatively narrow and monomodal molecular weight distributions (amongst the narrowest reported in the literature). The linear dependence of the molecular weight of the obtained PNB on the concentration of norbornene points toward a controlled polymerization reaction.

Original languageEnglish (US)
Pages (from-to)5241-5250
Number of pages10
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume47
Issue number20
DOIs
StatePublished - Oct 15 2009

Keywords

  • Catalysts
  • Gel permeation chromatography
  • Methylaluminoxane
  • NMR
  • Norbornene
  • Vinyl polymerization

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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