Ethylene polymerization on high activity Ziegler-Natta supported catalyst

Abstract

The catalytic polymerization of ethylene was investigated on High Activity Ziegler-Natta Supported Catalyst. Magnesium chloride reacted with ethanol and triethylaluminum before impregnation of titanium tetrachloride. The catalyst’s behavior was investigated by varying partial pressure of ethylene, ratio of triethylaluminum to titanium, partial pressure of hydrogenand percentage of iron to titanium modification. The activity of the supported catalyst is increased greater than that of the unsupported catalyst. The addition of iron (III) oxide to High Activity Ziegler-Natta Supported Catalyst can change the catalyst behavior resulting to the abrupt increase during initiation and sharp decrease on ethylene consumption due to deactivation. The polyethylenes from both catalysts were determined for physical and chemical properties. The polyethylene obtained from High Activity Ziegler-Natta Supported Catalyst had better morphol-ogical control and smaller melt flow index than the polyethylene from the modified Ziegler-Natta Supported Catalyst. The addition of the transition metal oxides to this catalyst system decreased average molecular weight, percentage of crystallinity and melting temperature of polyethylene. Both catalysts produce high density polyethylene.