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The synthesis of biodegradable polyesters for biomedical applications in supercritical dioxide has been the subject of a number of recent publications. However, systematic studies of the mechanism of polymerization in this novel medium are rare. In this work, we present the first systematic study of the ring-opening polymerization of ε-caprolactone catalyzed by the industrially important catalyst tin(II) ethyl hexanoate. We report on the effects of varying reagent concentrations and conditions on the products obtained after polymerization in scCO 2 and compare this with the results obtained in conventional reaction media.
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Bratton et al. (2005) studied this question.
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