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Journal of Polymer Research

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01-12-2013 | Original Paper

Ring-opening polymerization of ε-caprolactone initiated by samarium acetate

Authors: J. M. Contreras, D. Medina, F. López-Carrasquero, R. R. Contreras

Published in: Journal of Polymer Research | Issue 12/2013

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Abstract

Poly(ε-caprolactone) (PCL) was prepared by ring-opening polymerization initiated with samarium acetate. The effects of reaction temperature, molar ratio of monomer/initiator and reaction time on the conversion of ε-CL to PCL and the molecular weight were investigated. The temperature was varied between 80 and 150 °C and the molar ratio of monomer to initiator between 107 and 1000 mol/mol. The results indicate that the samarium acetate (SmAc₃) induces the polymerization of ε-CL to high conversion and polyesters with number-average molecular weights of 3.43 × 10³ to 12.60 × 10³ were obtained. The polymers were characterized by Nuclear Magnetic Resonance (¹H-NMR), size exclusion chromatography (SEC). Based on the ¹H-NMR end-group analysis of low-molecular-weight PCL, it was proposed a coordination–insertion mechanism for the polymerization. Kinetics study indicated that the polymerization rate is first-order with respect to monomer concentration.

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Title: Ring-opening polymerization of ε-caprolactone initiated by samarium acetate
Authors: J. M. Contreras
D. Medina
F. López-Carrasquero
R. R. Contreras
Publication date: 01-12-2013
Publisher: Springer Netherlands
Published in: Journal of Polymer Research / Issue 12/2013
Print ISSN: 1022-9760
Electronic ISSN: 1572-8935
DOI: https://doi.org/10.1007/s10965-013-0244-z

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