Titanium complexes bearing carbamato ligands as catalytic precursors for propylene polymerization reactions

TitleTitanium complexes bearing carbamato ligands as catalytic precursors for propylene polymerization reactions
Publication TypeJournal Article
Year of Publication2013
AuthorsHayatifar, M, Forte, C, Pampaloni, G, Kissin, YV, Galletti, AMR, Zacchini, S
JournalJournal of Polymer Science Part A: Polymer Chemistry
Volume51
Pagination4095–4102
KeywordsAtactic polypropylene, Carbamato ligands, Catalysts, Catalytic precursors, Ligands, Molar ratio, NMR analysis, Nuclear magnetic resonance spectroscopy, poly(propylene) (PP), Polymerization, Polyolefins, Polypropylenes, Propylene polymerization, Reaction parameters, titanium complex, Titanium complexes, Titanium compounds
Abstract

This report describes propylene polymerization reactions with titanium complexes bearing carbamato ligands, Ti(O2CNMe2)Cl 2 (I) and Ti(O2CR2)4 [R2 = NMe2 (II), NEt2 (III) and (IV)]. Combinations of these complexes and MAO form catalysts for the synthesis of atactic polypropylene, as confirmed by FT-IR, DSC and 13C NMR analysis. Effects of main reaction parameters on the catalyst activity were studied including the type of complex, solvent, temperature, and the [Al]/[Ti] molar ratio. The highest activity was observed when chlorobenzene was used as a solvent and AlMe 3-depleted MAO was employed as a cocatalyst. © 2013 Wiley Periodicals, Inc.

URLhttp://doi.wiley.com/10.1002/pola.26816
DOI10.1002/pola.26816