title: Of Poisons and Antidotes in Polypropylene Catalysis.
abstract: Quenched-flow studies of MgCl2 -supported Ziegler-Natta catalysts were combined for the first time with (13) C NMR fingerprinting of the nascent polymer and conclusively proved that, depending on the catalyst formulation, propene polymerization can be slowed down significantly by the occurrence of the few regiodefects (2,1 monomer insertions), changing active sites into dormant sites. Catalysts modified with ethylbenzoate show little dormancy. The more industrially relevant phthalate based catalysts, instead, are highly dormant and require the presence of H2 to counteract the deleterious effect of this self-poisoning on productivity and stereoselectivity.
authors.affiliation: Department of Chemical Sciences, Federico II University of Naples, Complesso di Monte S. Angelo, Via Cintia, 80126, Napoli, Italy.
authors.forename: Yue
authors.initials: Y
authors.lastname: Yu
authors.affiliation: Department of Chemical Sciences, Federico II University of Naples, Complesso di Monte S. Angelo, Via Cintia, 80126, Napoli, Italy.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Busico
authors.affiliation: Department of Chemistry, University of Manitoba, 144 Dysart Road-, Winnipeg, Manitoba, R3T 2N2, Canada.
authors.forename: Peter H M
authors.initials: PH
authors.lastname: Budzelaar
authors.affiliation: Department of Chemical Sciences, Federico II University of Naples, Complesso di Monte S. Angelo, Via Cintia, 80126, Napoli, Italy.
authors.forename: Antonio
authors.initials: A
authors.lastname: Vittoria
authors.affiliation: Department of Chemical Sciences, Federico II University of Naples, Complesso di Monte S. Angelo, Via Cintia, 80126, Napoli, Italy. rcipullo@unina.it.
authors.forename: Roberta
authors.identifier: 0000-0003-3846-1999
authors.initials: R
authors.lastname: Cipullo
keywords: NMR spectroscopy; alkenes; hydrogen; kinetics; polymerization