| Títol: | Sequence analysis of glycolide and p-dioxanone copolymers |
| Autor: | Rodríguez Galán, Rafael Alfonso
Franco García, María Lourdes
Puiggalí Bellalta, Jordi |
| Altres autors/autores: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Química |
| Matèries: | Àrees temàtiques de la UPC::Enginyeria química
Poliester
Polimerització |
| Tipus de document: | Article |
| Descripció: | Low and medium molecular weight copolymers constituted by glycolide and p-dioxanone units have been synthesized by a ring-opening polymerization. The p-dioxanone monomer was obtained from (2-hydroxyethoxy)acetate or by thermal depolymerization of poly(p-dioxanone). 1H and 13C NMR spectra were highly sensitive to the chemical sequences, which were effectively assigned by considering the data from samples with different compositions, and the acquisition of heteronuclear 1H and 13C NMR-correlated spectra. End groups were also identified, allowing methylene protons of sequences involving up to two glycolide units to be distinguished. These data seem basic to analyze degradation products or the influence of thermal treatments in chain microstructure. Glycolide/p-dioxanone copolymers are an interesting system because changes on chemical sequences can easily occur due to a depolymerization reaction that eliminates p-dioxanone residues. Furthermore, depending on the polymerization conditions, the occurrence of transesterification reactions may be highly significant. These reactions have a great impact in properties such as the melting temperature and can be easily quantified by NMR spectroscopy because of the occurrence of a new chemical sequence |
| Altres identificadors i accés: | Rodriguez, R.; Franco, M.; Puiggali, J. Sequence analysis of glycolide and p-dioxanone copolymers. "Journal of polymer science. Part A, polymer chemistry", Novembre 2009, vol. 47, núm. 24, p. 6758-6770.
0887-624X
http://hdl.handle.net/2117/7549
10.1002/pola.23715 |
| Disponible al dipòsit: | E-prints UPC
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