Kinetic Study of Chain Transfer Reactions upon 1-Hexene Polymerization on Highly Active Supported Titanium–Magnesium Catalysts

Data on the effect the concentrations of the monomer, triethylaluminium, and hydrogen on the molecular weight of polyhexene upon 1-hexene polymerization over supported titanium–magnesium catalyst are obtained. The ratios between propagation rate constant and the rate constants of the reactions of po...

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Bibliographic Details
Published in:Catalysis in industry 2019-07, Vol.11 (3), p.224-233
Main Authors: Echevskaya, L. G., Matsko, M. A., Zakharov, V. A.
Format: Article
Language:English
Subjects:
Catalysis
Catalysis in Chemical and Petrochemical Industry
Catalysts
Chain transfer
Chains (polymeric)
Chemistry
Chemistry and Materials Science
Hydrogen
Magnesium
Molecular weight
Molecular weight distribution
Monomers
Polydispersity
Polymerization
Polymers
Rate constants
Titanium
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Summary:Data on the effect the concentrations of the monomer, triethylaluminium, and hydrogen on the molecular weight of polyhexene upon 1-hexene polymerization over supported titanium–magnesium catalyst are obtained. The ratios between propagation rate constant and the rate constants of the reactions of polymer chain transfer with monomer, triethylaluminium (AlEt 3 ), triisobutylaluminium, and hydrogen are calculated. The data allow us to estimate the effect of individual reactions of chain transfer on the polymer’s molecular weight under different polymerization conditions. The data help to select polymerization conditions for obtaining polyhexene of a desired molecular weight. The heterogeneity of active centers is observed in the reaction of chain transfer with hydrogen when using AlEt 3 as co-catalyst, which alters the polymer’s polydispersity when the concentration of hydrogen is varied in the reaction mixture. The molecular weight distribution is analyzed via resolution into Flory components for polyhexene characterized by different polydispersity.
ISSN:2070-0504
2070-0555
DOI:10.1134/S2070050419030036