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Investigation of the kinetics of ethylene polymerization with supported titanium‐magnesium catalysts of various composition
Author(s) -
Skomorokhov Vladimir B.,
Zakharov Vladimir A.,
Kirillov Valerii A.
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970504
Subject(s) - polymerization , titanium , catalysis , monomer , magnesium , ethylene , chemistry , kinetics , polymer , diffusion , particle (ecology) , polymer chemistry , chemical engineering , materials science , thermodynamics , organic chemistry , physics , oceanography , quantum mechanics , engineering , geology
Abstract A mathematical model of the polymerization process is suggested on the basis of kinetic data, obtained for the polymerization of ethylene with supported titanium‐magnesium catalysts of various compositions differing in particle size, content of electron donor modifier, oxidation state of titanium in the initial catalyst and combination with different cocatalysts. The model includes stages of the formation and deactivation of active sites and takes into account monomer diffusion into the polymer particle. The analysis of experimental data by means of the mathematical model allowed to obtain the rate constants for single stages of the polymerization process. The suggested model and the obtained set of parameters allow to make a satisfactory description of a wide spectrum of experimental data, corresponding to different shapes of kinetic curves. The kinetic parameters were found to depend on the oxidation state of titanium in the catalyst and on the nature of the cocatalyst.