Abstract
The bulk polymerization of e-caprolactone at 110 and 155°C initiated by the tin complexes SnCl2 · 2H2O, SnCl4 · 5H2O, and SnCl2 · C4H8O2 (1,4-dioxane) has been compared to that initiated by tin(II) 2-ethyl hexanoate (octanoate). With 1H NMR spectroscopy, the monomer conversion and numberaverage degree of polymerization of poly(e-caprolactone) samples have been determined and the effective rate constants of reaction have been calculated. All the studied initiators provide a conversion of 98.0–99.5%. The polymers with the highest molecular masses were obtained in the presence of SnCl4 · 5H2O at 155°C and in the presence of the tin(II) chloride complex with dioxane at 110°C.
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