A binaphthyl-bridged salen dichlorozirconium (IV) complex that displays an octahedral structure with a trans-O, cis-N, and cis-Cl arrangement was synthesized and tested as a precatalyst for ethylene and a-olefin polymerization. While use of methylaluminoxane (MAO) cocatalyst afforded poor catalytic activity, activation by mixtures of aluminium alkyls such as AliBu3 and either MAO or [CPh3][B(C6F5)4] resulted in reasonable polymerization activities for ethylene, propene, and higher a-olefins. Quite unexpectedly, while the polymerization of propene results in the production of a high-molecular-weight stereoirregular polymer, highly isotactic polymers are obtained under similar conditions from polymerization of 1-butene, 1-pentene, and 1-hexene.
A Binaphthyl-Bridged Salen Zirconium Catalyst Affording Atactic Poly(propylene) and Isotactic Poly(a-olefins)
LAMBERTI, Marina;MAZZEO, Mina;PELLECCHIA, Claudio
2005
Abstract
A binaphthyl-bridged salen dichlorozirconium (IV) complex that displays an octahedral structure with a trans-O, cis-N, and cis-Cl arrangement was synthesized and tested as a precatalyst for ethylene and a-olefin polymerization. While use of methylaluminoxane (MAO) cocatalyst afforded poor catalytic activity, activation by mixtures of aluminium alkyls such as AliBu3 and either MAO or [CPh3][B(C6F5)4] resulted in reasonable polymerization activities for ethylene, propene, and higher a-olefins. Quite unexpectedly, while the polymerization of propene results in the production of a high-molecular-weight stereoirregular polymer, highly isotactic polymers are obtained under similar conditions from polymerization of 1-butene, 1-pentene, and 1-hexene.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
