The effect of halocarbon on catalyst activity of 1-hexene polymerization uisng Ziegler-Natta catalyst was investigated. At first, effect of temperature, co-catalyst concentration and monomer concentration was investigated to obtain optimal reaction conditions and maximum catalyst activity. Then, chlorocyclohexane was added in reaction medium and polymerization was carried out using 30ml of 1-hexene and 1.5 ml of Triisobutylaluminum (TIBA) as co-catalyst at Room temperature. It was found that the presence of halocarbon has a crucial role on the catalyst activity when compared to when no promoter was used. In addition, by incresing halocarbon to 2 ml ,the activity incresed and it has a descending trend thereafter.

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