During the past two decades,studies on single-site catalysts for olefin polymerization have been actively pursued in both academic and industrial research groups.This is because single-site catalysts possess well-defined structures and,thus,provide a better opportunity for rational catalyst design than the heterogeneous Ziegler-Natta catalysts.The vast majority of the catalysts investigated are group 4 metallocene derivatives though some are known to involve one cyclopentadienyl(Cp)ligand.
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