Highly Active and Isospecific Styrene Polymerization Catalyzed by Zirconium Complexes Bearing Aryl-substituted OSSO-Type Bisphenolate LigandsReportar como inadecuado




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Department of Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan





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Academic Editor: Changle Chen

Abstract OSSO-type dibenzyl zirconiumIV complexes 9 and 10 possessing aryl substituents ortho to the phenoxide moieties ortho substituents, phenyl and 2,6-dimethylphenyl Dmp were synthesized and characterized. Upon activation with dMAO dried methylaluminoxane, complex 9 was found to promote highly isospecific styrene polymerizations mm = 97.5%–99% with high molecular weights Mw up to 181,000 g·mmol−1. When the Dmp-substituted pre-catalyst 10-dMAO system was used, the highest activity, over 7700 g·mmol10−1·h−1, was recorded involving the formation of precisely isospecific polystyrenes of mm more than 99%. View Full-Text

Keywords: zirconium; post-metallocene; styrene polymerization; OSSO-type ligand; isotactic zirconium; post-metallocene; styrene polymerization; OSSO-type ligand; isotactic





Autor: Norio Nakata * , Tomoyuki Toda, Yusuke Saito, Takanori Watanabe and Akihiko Ishii *

Fuente: http://mdpi.com/



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