Abstract
AbstractEthylene has been polymerized under mild conditions by (1) transition metals plus alkyl halides, (2) transition metal hydrides, (3) certain transition metals alone, and (4) certain divalent transition metal halides and oxides. Propylene has been polymerized to mixtures of amorphous and crystalline polymer in low conversions by (1) transition metals plus alkyl halides and (2) certain divalent transition metal halides. A vibratory ball mill was used as the polymerization vessel to provide a continuous supply of fresh catalyst surface during the polymerizations. The transient existence of transition metal alkyls is postulated to account for the observed catalysis. This work provides one of the most direct proofs that polymerization occurs on the transition metal, rather than on aluminum, zinc, or other metals usually associated with it in typical Ziegler catalysts.
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