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Polypropylene Reactor Mixture Obtained with Homogeneous and Supported Catalysts by Queli Cruz Bastos; Maria De Fátima Vieira Marques is a Materials Science article available to read on EtoBox.

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## Abstract Propylene polymerizations were performed with homogeneous φ~2~C(Flu)(Cp)ZrCl~2~ and SiMe~2~(Ind)~2~ZrCl~2~ catalyst mixtures and with mixtures supported on the zeolite acid mordenite. The polymerizations were performed in toluene and hexane/triisobutylaluminum at different temperatures and Al(MAO)/Zr concentration ratios. The effects of these variables on the catalyst activity were investigated with statistical experimental planning. The average molecular weights, molecular weight distributions, melting temperatures, and crystallinities of the obtained polymers were examined. The results showed lower activities for the homogeneous catalyst mixture than for the isolated systems. On the other hand, high activities were obtained for the syndiospecific heterogeneous system, but very low values were obtained for the supported isospecific metallocene, although both catalysts were prepared under the same conditions. The supported binary system showed intermediary catalyst activity in comparison with the syndiospecific and isospecific supported catalysts. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 263–272, 2005

Who reads Polypropylene Reactor Mixture Obtained with Homogeneous and Supported Catalysts?

Author

Queli Cruz Bastos; Maria De Fátima Vieira Marques

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0887-624X)

Published

2004

Language

EN

Field

Materials Science (Physical Sciences)