NDLI: Kinetics and mechanism of ethylene homopolymerization and copolymerization reactions with heterogeneous Ti-based Ziegler–Natta catalysts

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Kinetics and mechanism of ethylene homopolymerization and copolymerization reactions with heterogeneous Ti-based Ziegler–Natta catalysts

Content Provider	Semantic Scholar
Author	Kissin, Yury V. Mink, Robert Ivan Nowlin, Thomas Edward Brandolini, Anita J.
Copyright Year	1999
Abstract	A detailed kinetic analysis of ethylene homopolymerization reactions and its copolymerization reactions with 1-hexene with a supported Ti-based Ziegler–Natta catalyst (reactions in the absence and the presence of hydrogen) shows a number of distinct kinetic features which are interpreted as a manifestation of multi-site catalysis; the catalyst contains several types of polymerization centers which differ in stability and formation rates, the molecular weight of polymers they produce, and in their response to the presence of α-olefins and hydrogen. All these effects require introduction of a special kinetic mechanism which postulates an unusually low activity of growing polymer chains containing one ethylene unit, the Ti–C2H5 group, in the ethylene insertion reaction into the Ti–C bond. This peculiarity of the Ti–C2H5 group, which is probably caused by its β-agostic stabilization, predicts two kinetic/chemical features of ethylene polymerization reactions which have not been described yet, the deuterium effect on the homopolymer structure and the activation effect of α-olefins on chain initiation. Both effects were confirmed experimentally.
Starting Page	69
Ending Page	88
Page Count	20
File Format	PDF HTM / HTML
DOI	10.1023/A:1019199330327
Volume Number	7
Alternate Webpage(s)	https://page-one.springer.com/pdf/preview/10.1023/A:1019199330327
Alternate Webpage(s)	https://doi.org/10.1023/A%3A1019199330327
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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