Highly syndiotactic propene polymn. in the presence of Cs-sym. metallocene cations is much less obvious than it may appear based on symmetry considerations alone. Effectively preventing the generation of m stereo-defects requires the assistance of a counterion able to slow site epimerization more than monomer insertion, but also seconding chain-migratory insertion in such a way that the pathway are not competitive. A good success in this delicate balance was achieved at the first attempt with MAO, in turn serendipitously discovered.

Metallocene-Catalyzed Propene Polymerization: From Microstructure to Kinetics. Cs-Symmetric ansa-Zirconocenes

BUSICO, VINCENZO;CIPULLO, ROBERTA;VACATELLO, MICHELE;
2003

Abstract

Highly syndiotactic propene polymn. in the presence of Cs-sym. metallocene cations is much less obvious than it may appear based on symmetry considerations alone. Effectively preventing the generation of m stereo-defects requires the assistance of a counterion able to slow site epimerization more than monomer insertion, but also seconding chain-migratory insertion in such a way that the pathway are not competitive. A good success in this delicate balance was achieved at the first attempt with MAO, in turn serendipitously discovered.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/482646
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