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Anionic ring-opening polymerization of cyclodisilazanes, 1. General aspects

✍ Scribed by Stéphane Bruzaud; Alain Soum

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
525 KB
Volume
197
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

The anionic ring‐opening polymerization of a model monomer of cyclodisilazanes 1, initiated with both organosodium and organolithium initiators, was investigated. Under specific conditions, this polymerization exhibits all the characteristics of a living process. Indeed, whatever the experimental conditions chosen, there is no evidence of back‐biting and/or transfer reactions competing with the propagation reaction. Kinetic measurements showed that this polymerization is first order with respect to the concentrations of both monmer and active centers. The absolute rate constant of propagation (k~p~) and the thermodynamic parameters (enthalpy and entropy) of the propagation step where calculated. On the basis of these results, a mechanism of the anionic ring‐opening polymerization of 1 is proposed.

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