• propylene polymerization;
  • heterogeneous Ziegler-Natta catalyst;
  • multiple active site;
  • kinetic model;
  • Monte Carlo technique


In this study, the kinetics of propylene polymerization catalyzed with the fourth heterogeneous Ziegler-Natta catalyst is studied. More than one type of active site is present in the propylene polymerization based on an analysis of the GPC curves. A multiple active site kinetic model (MSmodel) is proposed by using Monte Carlo technique. Good agreements in the polymerization kinetics are achieved for fitting the kinetic profiles with the MSmodel. In addition, the MSmodel is used to describe the dynamic evolutions of the active sites and their effects on the propylene polymerization. The simulated results indicate that different types of active sites have different polymerization kinetics and the site type can affect the propylene polymerization kinetics. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010