New tethered ansa‐bridged zirconium catalysts: Insights into the "self‐immobilization" mechanism. Issue 6 (24th December 2012)

• Record Type: Journal Article
• Authors: Polo, Eleonora; Losio, Simona; Sacchi, Maria Carmela; Galimberti, Maurizio
• Is Part Of: Journal of polymer science. Volume 51:Issue 6(2013:Mar.)
• Page Start: 1436
• Page End: 1447
• Publication Date: 2012-12-24
• Subjects: 547
• DOI: 10.1002/pola.26516
• Languages: English
• ISSNs: 0887-624X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>New ω‐alkenyl‐substituted <italic>ansa</italic>‐bridged bisindenyl zirconium complexes are prepared and tested as self‐immobilized catalysts for ethene polymerization. But, even at very high concentration of the tethered complexes and low pressure of ethene, there is no evidence of their insertion into the polyethene chain. A "cross polymerization" test, performed by copolymerizing the tethered complexes with ethene using <italic>rac</italic>‐Me₂Si(2‐MeBenzInd)₂ZrCl₂ (<bold>MBI</bold>), does not lead to their incorporation into the polyethene chain. However, the corresponding ligand proves to be a suitable comonomer for ethene, and, through copolymerization promoted by <bold>MBI, </bold> innovative poly(ethene‐<italic>co</italic>‐2, 2′‐bis[(1<italic>H</italic>‐inden‐3′‐yl)‐hex‐5‐ene) copolymers are prepared and characterized by ¹³C NMR. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013</p> </abstract>