Synthesis and characterization of ethylene-1-hexene copolymers using homogeneous Ziegler-Natta catalysts (original) (raw)
This study investigated the copolymerization of ethylene with l-hexene using the homogeneous Et[Ind]2ZrC12 and [lnd]2ZrC! 2 catalysts. The Et[Ind]2ZrC12 catalyst gave a higher catalytic activity than the [Ind]2ZrCl 2 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 l-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 1hexene confirmed the more successful incorporation of the comonomer for the polymerization catalyzed by Et[Ind]2ZrCI 2.
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