Premium
Kinetic Features of Hexene‐1 Polymerization over Supported Titanium–Magnesium Catalyst
Author(s) -
Echevskaya Ludmila,
Matsko Mikhail,
Nikolaeva Marina,
Sergeev Sergei,
Zakharov Vladimir
Publication year - 2014
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.201400009
Subject(s) - polymerization , chain transfer , magnesium , polymer chemistry , titanium , chemistry , catalysis , hexene , 1 hexene , coordination polymerization , degree of polymerization , ethylene , solution polymerization , materials science , organic chemistry , radical polymerization , polymer
The data on the effect of cocatalyst composition and polymerization conditions on activity and MWD of polyhexene (PH) produced over a high‐activity titanium‐magnesium catalyst are obtained. The cocatalyst has an extremely strong effect on the MWD of polyhexene. When triisobutylaluminum is used as a cocatalyst, PH with high Mw and narrow MWD is produced. The use of TEA decreases the Mw of PH and broadens the MWD. It is found the ratio between the rate constant of chain transfer to TEA ( k tr Al ) and the propagation rate constant ( k p ) is two orders of magnitude higher than the k tr Al / k p value calculated for polymerization of ethylene and propylene. We attributed this effect to formation of polyhexene in the solution, as opposed to polymerization of ethylene and propylene in slurry polymerization. The addition of hydrogen at polymerization of hexene‐1 significantly increases activity and stereospecificity.