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The role of non‐coordinating anions in homogeneous olefin polymerization
Author(s) -
Siedle A. R.,
Lamanna W. M.,
Newmark R. A.,
Stevens J.,
Richardson D. E.,
Ryan M.
Publication year - 1993
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.19930660119
Subject(s) - steric effects , chemistry , homogeneous , polymerization , olefin fiber , catalysis , polymer , polymer chemistry , chain transfer , olefin polymerization , chain propagation , metal , organic chemistry , radical polymerization , thermodynamics , physics
We present an overview of homogeneous olefin polymerization catalysts in which chain initiation and propagation involves a metallocenium ion (e.g. Cp 2 ZrMe + ) that can be produced by equilibrium or irreversible CH 3 − transfer. The Kaminsky catalyst is an example of the former. Complexes of (C 6 F 5 ) 3 B with water, alcohols, mercaptans, silanols and oximes are strong acids which can protonate dialkylmetallocenes to produce weakly‐coordinated metallocenium salts that are hydrocarbon soluble and which produce high molecular weight poly‐1‐olefins. Polymer molecular weight is correlated with the steric and electronic effects of the ligands attached to the metal.