SUMMARY:The molecular weight (MW) and the molecular weight distribution (MWD) of polyethylene (PE) prepared with various metallocene catalysts were investigated. The weight-average molecular weight (MW) of PE prepared with dicyclopentadienyltitanium dichloride/ aluminoxane (Cp,TiCl,/MAO) was about 4,O. lo', while that of PE obtained withPE of bimodal MWD was obtained with the mixed catalyst Cp,TiCl,/Cp,ZrCl,. Narrow MWD PE was obtained with the mixed catalyst Cp2ZrC1,/Et(ind),ZrC1,, because each catalyst produced an M, of 1,0 * lo5. However, the change of temperature during the polymerization with the mixture Cp,ZrC1,/Et(ind)2ZrClz produced PE with a bimodal MWD and a value of the ratio of weight-to number-average molecular weights of a w / M n = 4.
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