The polyethylene obtained in the presence of the catalyst constituted by the meso isomer of the prototypical zirconocene complex (ethylene)bis(l-indenyDzirconium dichloride activated by methylalumoxane is characterized by the presence of ethyl branches. The intensities of the 13C NMR signals associated with these branches indicate that there are about 1-2 ethyl groups per 100 monomer units. As a consequence, the melting temperature is 10-15 °C lower than the linear polyethylene obtained with the rac mixture of the same zirconocene complex. On the basis of kinetic evidence, a branching mechanism that involves a 9-H transfer to the coordinated ethylene is proposed. © 1999 American Chemical Society.

Branched polyethylene by ethylene homopolymerization with meso-zirconocene catalyst

Izzo, L.
;
1999-01-01

Abstract

The polyethylene obtained in the presence of the catalyst constituted by the meso isomer of the prototypical zirconocene complex (ethylene)bis(l-indenyDzirconium dichloride activated by methylalumoxane is characterized by the presence of ethyl branches. The intensities of the 13C NMR signals associated with these branches indicate that there are about 1-2 ethyl groups per 100 monomer units. As a consequence, the melting temperature is 10-15 °C lower than the linear polyethylene obtained with the rac mixture of the same zirconocene complex. On the basis of kinetic evidence, a branching mechanism that involves a 9-H transfer to the coordinated ethylene is proposed. © 1999 American Chemical Society.
1999
https://www.scopus.com/inward/record.uri?eid=2-s2.0-0033204864&partnerID=40&md5=bb39c8d5768748492e9d800b8ec0c58c
Izzo, L.; Caporaso, L.; Senatore, G.; Oliva, L.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/2066489
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