Stereoselective polymerization of α-olefins by heterogeneous chiral Ziegler-Natta catalysts

Abstract

MgCl 2 -supported TiCl 3 catalysts were prepared to contain either chiral (racemic or optically active) or nonchiral Lewis basic esters. They were compared along with ordinary TiCl 3 in the stereospecific polymerization of propylene and in the stereoselective and stereoelective polymerization of chiral 3- and 4-methyl-substituted olefins. The number and type of active sites, kinetic parameters, stereoregularity and optical purity of the polymers were determined.