Abstract
Two types of inorganic supports, MgCl 2 and SiO 2, for use in the impregnation of catalysts, were prepared by the recrystallization and the sol–gel methods, respectively. The Ziegler–Natta/Metallocene hybrid and mixed catalysts were prepared in order to control the molecular weight (Mw) and the molecular weight distribution (MWD) during ethylene polymerization. The polyethylene produced by the Ziegler–Natta/Metallocene hybrid and mixed catalysts showed two melting temperatures and a bimodal MWD, corresponding to products arising from each of the individual catalysts. This suggests that these Ziegler–Natta/Metallocene catalysts acted as individual active species and produced a blend of polymers.
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