Synthesis and characterization of ethylene-1-hexene copolymers using homogeneous Ziegler-Natta catalysts |
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| Authors: | Raul Quijada Rosângela B Scipioni Raquel S Mauler Griselda B Galland Márcia S L Miranda |
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| Affiliation: | (1) Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, Brazil;(2) Present address: Departamento de Ingenieria Química, Fac. Ciencias Físcas y Matemáticas, Universidad de Chile, Casilla, 2777 Santiago, Chile |
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| Abstract: | Summary This study investigated the copolymerization of ethylene with 1-hexene using the homogeneous EtInd]2ZrCl2 and Ind]2ZrCl2 catalysts. The EtInd]2ZrCl2 catalyst gave a higher catalytic activity than the Ind]2ZrCl2 and also showed a better incorporation of 1-hexene for the same comonomer concentration in the feed. Thermal analysis (DSC) and viscosity measurements showed that an increase of the 1-hexene incorporated in the copolymer results in a decrease of the melting point, crystallinity and molecular weight of the polymer formed. The reactivity ratios for ethylene and 1-hexene confirmed the more successful incorporation of the comonomer for the polymerization catalyzed by EtInd]2ZrCl2. |
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