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Ti–Mg-catalysts for propylene polymerization: the donor effect
Abstract
There is investigation of practically important chain with hydrogen transfer in the polymerization of propylene on the Ti-Mg-catalyst (TMC). The catalyst has a TiCl4/D1/MgCl2–AlEt3/D2 composition in which electron donor compounds D1 (internal donor) and D2 (external donor) enable a high stereospecificity of the catalyst. Proposed two-step reaction mechanism of chain transfer, which explains the fractional order of hydrogen concentration rate, and proposed determining method of the rate constants for the reaction on a wide range of hydrogen concentrations for catalysts with different donors. The values of these constants are high and close to the rate constants of growth for catalysts containing as internal donor, 1,3-diester of dibutyl phthalate, without an external donor or tetraethoxysilane as D2. When using dicyclopentyldimethoxysilane instead of tetraethoxysilane the rate constant for chain transfer is about five times lower.The obtained data can be used to industrial propylene polymerization simulate and to molecular weight of the polymer regulate.
About the Authors
G. D. Bukatov
Boreskov Institute of Catalysis SB RAS, Novosibirsk
Russian Federation
Russian Federation
S. A. Sergeev
Boreskov Institute of Catalysis SB RAS, Novosibirsk
Russian Federation
Russian Federation
V. A. Zakharov
Boreskov Institute of Catalysis SB RAS, Novosibirsk
Russian Federation
Russian Federation
L. G. Echevskaya
Boreskov Institute of Catalysis SB RAS, Novosibirsk
Russian Federation
Russian Federation
M. A. Matsko
Boreskov Institute of Catalysis SB RAS, Novosibirsk
Russian Federation
Russian Federation
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Review
For citations:
Bukatov G.D., Sergeev S.A., Zakharov V.A., Echevskaya L.G., Matsko M.A. Ti–Mg-catalysts for propylene polymerization: the donor effect. Kataliz v promyshlennosti. 2011;(1):14-19. (In Russ.)
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