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vol.47 número2ANTIBACTERIAL ACTIVITY OF 13-EPI-SCLAREOL, A LABDANE TYPE DITERPENE ISOLATED FROM PSEUDOGNAPHALIUM HETEROTRICHIUM AND P. CHEIRANTHIFOLIUM (ASTERACEAE) índice de autoresíndice de assuntospesquisa de artigos
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Boletín de la Sociedad Chilena de Química

versão impressa ISSN 0366-1644

Resumo

GUEVARA, JUAN LUIS et al. ESTUDIO DE LA POLIMERIZACION DE PROPENO UTILIZANDO DIFERENTES CATALIZADORES METALOCENOS. Bol. Soc. Chil. Quím. [online]. 2002, vol.47, n.2, pp.81-90. ISSN 0366-1644.  http://dx.doi.org/10.4067/S0366-16442002000200003.

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

Palavras-chave : Metallocene catalyst; polymerization; polypropylene; tacticity.

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