Polymerized microstructures, definition

Fundamental studies have led to a detailed insight into the mechanism of the polymerization and the control of the microstructure through the substituents on the cyclopentadienyl ligands. For a survey of these studies and the dominant effects playing a role the reader is referred to recent contributions by Ewen [38] and Erker [48]. In the present chapter we will summarize a few of the features that play a role in determining the microstructure the field is still in development and obviously the definite answer to several questions has not yet been given. 

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