Synthesis of (Ind)2ZrCl2 Catalyst for Copolymerization of Ethylene and Propylene: Parameters Effect on Productivity

Document Type : Research Paper

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Abstract

Bis(indenyl)zirconium dichloride as a catalyst was synthesized using a modified method at the room temperature. Polymerization of ethylene and copolymerization of ethylene and propylene were carried out by this metallocene catalyst. Ethylene propylene (P/E) feed ratios of 0.25, 0.5, 1, and 2 were employed into the copolymerization systems. Copolymerization conditions like cocatalyst/catalyst ratio, copolymerization temperature, feed ratio and the viscosity average molecular weight (Mv) changing with copolymerization temperature were investigated. Higher ratio of [Al]/[Zr]=750:1 increased the activity of the catalyst. However, higher concentration of the cocatalyst slightly reduced the activity. Viscosity-average molecular weight of polymer decreased with high ratio of [Al]/[Zr]. The highest activity was obtained at 60oC. Increases in copolymerization temperature decreased the viscosity-average molecular weight and ethylene content of the polymeric products. Increases in propylene content of the feed ratio produced
amorphous polymers with products of increased glass transition temperatures.
Kinetic reaction displayed a decay type of reaction.

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Iranian Journal of Polymer Science and Technology
Volume 23, Issue 5 - Serial Number 5
January and February 2011
Pages 379-386

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