Group 4 metals complexes bearing anilidomethylpyridine ligands have been synthesized and characterized by nuclear magnetic resonance (NMR) spectroscopy, elemental analysis, and single-crystal X-ray diffraction analysis. All complexes, after activation by using AliBu2H and methylalumoxane (MAO) were tested in 1,3-butadiene and R-olefins polymerization. The zirconium complexes showed higher activity with respect to the titaniumhomologous. Polymerization of ethylene resulted, in all cases in the production of high molecular weight linear polyethylene. Propylene polymerization tests provided substantially atactic polypropylene. 1,3-Butadiene polymerizations produced cis-1,4 polybutadiene, and in the case of zirconium complexes polymers with a content of cis-1,4 units higher a 99.9% were provided. Activity and stereoselectivity of the catalysts were related to the steric features of the complexes.

New (Anilidomethyl)pyridine Titanium(IV) and Zirconium(IV) Catalyst Precursors for the Highly Chemo- and Stereoselective cis-1,4-Polymerization of 1,3-Butadiene

PAPPALARDO D;
2011

Abstract

Group 4 metals complexes bearing anilidomethylpyridine ligands have been synthesized and characterized by nuclear magnetic resonance (NMR) spectroscopy, elemental analysis, and single-crystal X-ray diffraction analysis. All complexes, after activation by using AliBu2H and methylalumoxane (MAO) were tested in 1,3-butadiene and R-olefins polymerization. The zirconium complexes showed higher activity with respect to the titaniumhomologous. Polymerization of ethylene resulted, in all cases in the production of high molecular weight linear polyethylene. Propylene polymerization tests provided substantially atactic polypropylene. 1,3-Butadiene polymerizations produced cis-1,4 polybutadiene, and in the case of zirconium complexes polymers with a content of cis-1,4 units higher a 99.9% were provided. Activity and stereoselectivity of the catalysts were related to the steric features of the complexes.
1,3-Butadiene; catalysis; group 4 metals
File in questo prodotto:
File Dimensione Formato  
Dieni_Macrom2011.pdf

non disponibili

Licenza: Non specificato
Dimensione 1.07 MB
Formato Adobe PDF
1.07 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12070/6661
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 39
  • ???jsp.display-item.citation.isi??? 37
social impact