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.
Autori: | |
Data di pubblicazione: | 1999 |
Titolo: | Branched polyethylene by ethylene homopolymerization with meso-zirconocene catalyst |
Rivista: | MACROMOLECULES |
Digital Object Identifier (DOI): | 10.1021/ma982406q |
Codice identificativo ISI: | WOS:000084329300068 |
Codice identificativo Scopus: | 2-s2.0-0033204864 |
URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-0033204864&partnerID=40&md5=bb39c8d5768748492e9d800b8ec0c58c |
Appare nelle tipologie: | Articolo su Rivista |
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