Abstract
AbstractBinary copolymerizations of ethylene, propylene and butene‐1 were studied. The copolymers show a tendency to an alternating sequence distribution if prepared by syndiospecific catalysts, whereas they show a random distribution when prepared by non‐stereospecific or by isospecific catalysts.These facts indicate that syndiotacticity is due to steric interactions between monomer and last unit of the growing chain end and that isotacticity is due to steric interactions between monomer and counter‐ion. The propylene‐butene‐1 copolymerization shows that the side‐chain rotations of the last added unit are hindered in the presence of syndiospecific catalysts.
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