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Effect of hydrogen on the ethylene polymerization process over Ziegler–Natta catalysts supported on MgCl 2 (THF) 2 . II. Kinetic studies
Author(s) -
Czaja Krystyna,
Białek Marzena
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/1097-4628(20010110)79:2<361::aid-app210>3.0.co;2-d
Subject(s) - polymerization , natta , polyethylene , ethylene , catalysis , ziegler–natta catalyst , polymer chemistry , hydrogen , dispersity , chemistry , vanadium , titanium , reactivity (psychology) , organic chemistry , polymer , medicine , alternative medicine , pathology
This article reports on a study of the effects of hydrogen on the activity of vanadium and titanium catalysts supported on MgCl 2 (THF) 2 in ethylene polymerization. It was found that hydrogen did not change the stable nature of the active sites and the polydispersity index of the polyethylene obtained. The propagation rate, expressed as k p , was found to be independent of the presence and concentration of hydrogen, indicating that this reacting agent does not modify the reactivity of the active sites. However, the presence of hydrogen in the polymerization medium is responsible for partial deactivation of the active sites just before polymerization is initiated. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 361–365, 2001