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Keywords:

  • electron donor;
  • mathematical modeling;
  • polypropylene;
  • simulation;
  • Ziegler-Natta catalyst

Abstract

Heterogeneous Ziegler-Natta catalysts are still the most important catalysts for the industrial production of polyolefins, despite the discovery of high-activity metallocene systems in the eighties. Despite of their huge commercial importance, several aspects of Ziegler-Natta catalysts are still poorly understood from both qualitative and quantitative points of view. Especially for polypropylene, a very important factor controlling product quality is the effect of the electron donor used to modify the catalyst. In this manuscript we present, for the first time, a quantitative mathematical model that describes the effect of electron donors on the tacticity of polypropylene made with multiple-site type catalysts.