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ε-Caprolactone/ZnCl2 complex formation: Characterization and ring-opening polymerization mechanism

✍ Scribed by Gustavo A. Abraham; Alberto Gallardo; Angel E. Lozano; Julio San Roman

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
262 KB
Volume
38
Category
Article
ISSN
0887-624X

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✦ Synopsis

Caprolactone (-CL) has been mixed with ZnCl 2 at different mol ratios. The resulting complex was characterized through 1 H and 13 C NMR spectroscopy in bulk and in solutions, differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and optical microscopy. Ring-opening polymerization of -caprolactone [M] using ZnCl 2 as an initiator [I] at different monomer/initiator ratios has been successfully performed in xylene. The molecular weight of poly(-caprolactone) (PCL) as measured by gel permeation chromatografy (GPC) was found to depend linearly on the [M]/[I] ratio. Theoretical calculations were carried out to understand the geometry of the complex and the operating ring-opening mechanism. Both experimental and computational results and the presence of methylene-chloride end group, confirmed by NMR, are in agreement with a coordination-insertion mechanism for the ring-opening polymerization proposed in this article.

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