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Multiplicity of active species in transition metal based catalysts: The various reaction processes involved
Author(s) -
Sigwalt P.,
Deffieux A.
Publication year - 1987
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19870120104
Subject(s) - polymerization , transition metal , catalysis , styrene , polymer , metal , materials science , multiplicity (mathematics) , polymer chemistry , titanium , chemistry , organic chemistry , copolymer , mathematics , mathematical analysis
Products resulting from the polymerization of α‐olefins and of styrene initiated by transition metal based catalytic systems may range from dimers of various structures to high mol. wt. polymers of different stereoregularities. In this report, it is shown that such a large variety of products may be obtained using the same transition metal compound. Initiating systems derived from tetrabenzylzirconium are first examined. The nature of the various mechanisms involved according to polymerization conditions are discussed. A rather similar situation is observed for systems derived from titanium trichloride. In this series, however, Ziegler‐type processes can be generated much more cleanly. This led us to examine the mechanisms in more detail in order to distinguish the various types of active species which may participate to these polymerizations.