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Polymer Bulletin

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01-01-2014 | Original Paper

Ethyl magnesium bromide as an efficient anionic initiator for controlled polymerization of ε-caprolactone

Authors: Lenka Malinová, Jiří Brožek

Published in: Polymer Bulletin | Issue 1/2014

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Abstract

The ring-opening polymerization of ε-caprolactone initiated by ethyl magnesium bromide was studied. Because ring-opening polymerization is extremely fast in the monomer phase, we focused on solution polymerization in toluene. The solution polymerization of ε-caprolactone was characterized by the linear dependence of degree of conversion on polymerization time, which we described by a first-order kinetic equation. The molar mass, determined by SEC using a light scattering detector, was in agreement with that calculated from the degree of conversion attained and the ratio of ε-caprolactone to ethyl magnesium bromide. On this basis, we propose a mechanism for the effect of ethyl magnesium bromide on ε-caprolactone polymerization and provide evidence for this mechanism by isolating a novel stable complex of magnesium bromide with ε-caprolactone.

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Title: Ethyl magnesium bromide as an efficient anionic initiator for controlled polymerization of ε-caprolactone
Authors: Lenka Malinová
Jiří Brožek
Publication date: 01-01-2014
Publisher: Springer Berlin Heidelberg
Published in: Polymer Bulletin / Issue 1/2014
Print ISSN: 0170-0839
Electronic ISSN: 1436-2449
DOI: https://doi.org/10.1007/s00289-013-1048-3

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