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The Ziegler catalyst, a combination of TiCl4 and Al(C2H5)2Cl, is a very poor catalyst for propylene polymerization. However, the addition of Mg(C4H9)2 to the Ziegler catalyst at a [Mg]:[Al] molar ratio < 0.5 leads to the formation of a potent catalyst system for homopolymerization of propylene. Polymers produced with the TiCl4–Al(C2H5)2Cl/Mg(C4H9)2 catalyst are mostly atactic and amorphous, their...
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