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Metal Chelates as Polymerization Initiators
Author(s) -
Kastning E.G.,
Naarmann H.,
Reis H.,
Berding C.
Publication year - 1965
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.196503221
Subject(s) - polymerization , polymer chemistry , chemistry , chelation , metal , photochemistry , ionic polymerization , cobalt , styrene , steric effects , radical polymerization , polymer , organic chemistry , copolymer
Metal chelates can be used as initiators in the polymerization of vinyl compounds. Their action, as shown here for the polymerization of styrene, is determined by both the central atom and the ligand. Chelates of manganese (III) and cobalt (III) with 1,3‐dicarbonyl compounds are most effective. The metal chelate initiators can be activated by γ‐ or ultraviolet irradiation, or else by combination with cocatalysts such as organic halogen compounds or unsaturated hydrocarbons which are typical π‐complex formers. There is some evidence indicating that the polymerization takes place via a free‐radical mechanism. The central metal atom affects the steric configuration of the polymer chain.