Artículo
e-Caprolactone / ZnCl2 complex formation: characterization and ring-opening polymerization mechanism
Fecha de publicación:
09/03/2000
Editorial:
John Wiley & Sons Inc
Revista:
Journal of Polymer Science Part A: Polymer Chemistry
ISSN:
0887-624X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
ε-Caprolactone (ε-CL) has been mixed with ZnCl2 at different mol ratios. The resulting complex was characterized through 1H and 13C NMR spectroscopy in bulk and in solutions, differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and optical microscopy. Ring-opening polymerization of ε-caprolactone [M] using ZnCl2 as an initiator [I] at different monomer/initiator ratios has been successfully performed in xylene. The molecular weight of poly(ε-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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Articulos(INTEMA)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Articulos de INST.DE INV.EN CIENCIA Y TECNOL.MATERIALES (I)
Citación
Abraham, Gustavo Abel; Gallardo, Alberto; Lozano, Angel E.; San Roman, Julio; e-Caprolactone / ZnCl2 complex formation: characterization and ring-opening polymerization mechanism; John Wiley & Sons Inc; Journal of Polymer Science Part A: Polymer Chemistry; 38; 8; 9-3-2000; 1355-1365
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