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М. Uhniat, М. Rubaj

Polydispersity and rheological properties of polypropylene prepared in the presence of I and II generation catalysts

Polimery 1989, No 6-7, 315

DOI: dx.doi.org/10.14314/polimery.1989.315


Samples of polypropylene prepared either with a catalyst containing classical form of TiCl3 or with the II generation catalysts containing modified TiCl3 of Lynx 900- and Stauffer-types have been investigated. The viscosity, number, and weight average molecular masses as well as molecular mass distribution curves from extraction fractionation have been determined and compared. Some rheological properties, namely melt flow index and melt viscosity, have also been compared. Polypropylene samples prepared with the classical catalytic system and with the Stauffer-type II generation catalyst have a bimodal molecular mass distribution, whereas polypropylene samples with the Lynx-type catalyst exhibit one maximum on the molecular mass distribution curve. Type of catalyst does not influence the rheological properties of polypropylene.

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