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Kinetic Studies of Chain-Transfer Reactions in Polymerization of Hexene-1 over Highly Active Supported Titanium-Magnesium Catalysts
https://doi.org/10.18412/1816-0387-2019-2-104-113
Abstract
The influence of concentrations of the monomer, triethylaluminum, and hydrogen on the molecular mass of polyhexene obtained by polymerization of hexene-1 over a supported titanium-magnesium catalyst was studied. Ratios of rate constants of the transfer of polymer chain with the monomer, triethylaluminum (AlEt3) and hydrogen to the rate constant of the chain-growth were calculated.
The data obtained allowed the contribution of individual reactions of chain transfer to molecular mass of the polymer to be estimated at various polymerization conditions and the polymerization conditions to be chosen deliberately in order to synthesize polyhexene with the required molecular mass. The discovered inhomogeneity of the centers active to the chain transfer with hydrogen in the presence of the AlEt3 co-catalyst caused changes in the polymer polydispersion upon changes in the hydrogen concentration in the reaction medium. Curves of the polyhexene molecular mass distribution in polyhexene samples with different polydispersion were analyzed using their resolution into Flory components.
About the Authors
L. G. Echevskaya
Boreskov Institute of Catalysis, Novosibirsk
Russian Federation
Russian Federation
M. A. Matsko
Boreskov Institute of Catalysis, Novosibirsk
Russian Federation
Russian Federation
V. A. Zakharov
Boreskov Institute of Catalysis, Novosibirsk
Russian Federation
Russian Federation
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Review
For citations:
Echevskaya L.G., Matsko M.A., Zakharov V.A. Kinetic Studies of Chain-Transfer Reactions in Polymerization of Hexene-1 over Highly Active Supported Titanium-Magnesium Catalysts. Kataliz v promyshlennosti. 2019;19(2):104-113. (In Russ.) https://doi.org/10.18412/1816-0387-2019-2-104-113
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