Abstract

The present study reports the propylene polymerization using four different metallocene catalysts: rac-Et(Ind)2ZrCl2 (I); rac-Et(2-Me-Ind)2ZrCl2 (II); rac-Me2Si(Ind)2ZrCl2 (III) and Ph2C(Flu)(Cp)ZrCl2 (IV) in the presence of Metilaluminoxane (MAO) as cocatalyst. The polymerization carried out using different conditions of temperature, catalyst concentration, cocatalyst/catalyst ration and monomer concentration. The study was made with the aid of a statistical model of experimental planning. It was observed that the type of catalyst, and the experimental conditions of reaction have a significative influence in the catalytic activity and the properties of polymers obtained. Elevated values of activity were found at temperature of 70°C with catalysts I and III. Catalyst III produced polypropylenes with highest isotacticity. With catalyst IV were obtained syndiotactics polymers.