Polymerization of ethylene using a high‐activity Ziegler–Natta catalyst. I. Kinetic studies

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Abstract
Factors affecting the particular shape of kinetic rate–time profiles in the polymerization of ethylene with a MgCl2‐supported TiCl4catalyst activated by Al(C2H5)3have been investigated. Examination of the dependence of the polymerization rate on the concentration of Al(C2H5)3resulted in a Langmuir–Hinshelwood rate law. Analysis of the polymerization rate as a function of the polymerization temperature gave about 46 kJ mol−1for the overall activation energy. Examination of the rapid decay of the polymerization rate with time showed that this decay is represented better by a first‐order decay law than by a second‐order one. © 1993 John Wiley & Sons, Inc.