Details

Autor(en) / Beteiligte

• Giffin, Kaitie A
• Cirriez, Virginie
• Santoro, Orlando
• Welle, Alexandre
• Kirillov, Evgueni
• Carpentier, Jean-François

Titel

Meso - and Rac -[bis(3-phenyl-6- tert -butylinden-1-yl)dimethylsilyl]zirconium Dichloride: Precatalysts for the Production of Differentiated Polyethylene Products with Enhanced Properties

Ist Teil von

• Polymers, 2022-05, Vol.14 (11), p.2217

Ort / Verlag

Switzerland: MDPI AG

Erscheinungsjahr

2022

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• -zirconocene complexes are widely employed as precatalysts for olefin polymerization. Their synthesis generally leads to mixtures of their and isomers, whose separation is often problematic. In this contribution, we report on the synthesis of a novel silyl-bridged bis(indenyl)-based metallocene, and on the separation of its and isomers by simple recrystallization from toluene. The two complexes, activated by methylaluminoxane (MAO), have been used as precatalysts in ethylene/1-hexene copolymerization. Regardless of the reaction conditions, the complex outperformed its congener. A similar trend was observed by performing the process in the presence of the silica-supported versions of the complexes. This is remarkable, since metallocenes generally display lower activities than their analogues. Furthermore, the isomer generates polymer products that are more in line with the targets for the preparation of a bimodal PE grade made of a lower-MW high-density (HDPE) fraction and a higher-MW linear low-density (LLDPE) fraction.