synthesis of (ind)2zrcl2 catalyst for copolymerization of ethylene and propylene: parameters effect on productivity

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 producedamorphous polymers with products of increased glass transition temperatures.kinetic reaction displayed a decay type of reaction.