Some General Features of Propagation Centers in One-Component Polymerization Catalysts

Some General Features of Propagation Centers in One-Component Polymerization Catalysts 

Despite the difference in composition of various olefin polymerization catalysts the problems of the mechanism of their action have much in common. The difference between one-component and traditional Ziegler-Natta two-component catalysts seems to exist only at the stage of genesis of the propagation centers, while the mechanism of the formation of a polymer chain on the propagation center formed has many common basic features for all the catalytic systems based on transition metal compounds. 

The specific behavior of surface compounds, being the propagation centers of polymerization catalysts, are mainly determined by two of their features the coordinative insufficiency of the transition metal ion and the presence of the transition metal-carbon bond. 

Coordinative Insufficiency of Transition Metal Ions in Active 

The Formation of Ions with Vacant Coordination Sites 

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