This report describes propylene polymerization reactions with titanium complexes bearing carbamato ligands, Ti(O2CNMe2)Cl2 (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 AlMe3-depleted MAO was employed as a cocatalyst.
Titanium complexes bearing carbamato ligands as catalytic precursors for propylene polymerization reactions / Mohammad Hayatifar; Claudia Forte; Guido Pampaloni; Yury V. Kissin; Anna Maria Raspolli Galletti; Stefano Zacchini. - In: JOURNAL OF POLYMER SCIENCE. PART A, POLYMER CHEMISTRY. - ISSN 0887-624X. - STAMPA. - 51:(2013), pp. 4095-4102. [10.1002/pola.26816]
Titanium complexes bearing carbamato ligands as catalytic precursors for propylene polymerization reactions
ZACCHINI, STEFANO
2013
Abstract
This report describes propylene polymerization reactions with titanium complexes bearing carbamato ligands, Ti(O2CNMe2)Cl2 (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 AlMe3-depleted MAO was employed as a cocatalyst.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
