Influence of indenyl ligand substitution pattern on metallocene-catalyzed propene copolymerization with 1-octene

✍ Scribed by Martin Julius Schneider; Rolf Mülhaupt

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 433 KB
• Volume: 198
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1997.021980415

✦ Synopsis

Abstract

Copolymerization of propene with 1‐octene (1 mol/1 mol) was performed in toluene at 40°C in the presence of homogeneous methylaluminoxane (MAO)‐activated ansa‐metallocenes in order to study the role of benzannelation and 2‐methyl‐substitution of the silylene‐bridged bisindenyl ligand on comonomer incoporation, molecular mass, molecular mass distribution, and end groups. While 2‐methyl‐substitution promoted higher degree of polymerization without affecting copolymerization parameters, benzannelation improved markedly 1‐octene incorporation. Only with MAO‐activated rac‐Me~2~Si(2‐MeBenz[e]Ind)~2~ZrCl~2~ catalysts vinylidene end groups were formed exclusively. Molecular weight distribution remains narrow in all experiments.