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Citació: Lavilla, C. [et al.]. Biodegradable aromatic copolyesters made from bicyclic acetalized galactaric acid. "Journal of polymer science. Part A, polymer chemistry", 15 Agost 2012, vol. 50, núm. 16, p. 3393-3406.
Títol: Biodegradable aromatic copolyesters made from bicyclic acetalized galactaric acid
Autor: Lavilla Aguilar, Cristina Veure Producció científica UPC; Alla Bedahnane, Abdelilah Veure Producció científica UPC; Martínez de Ilarduya Sáez de Asteasu, Domingo Antxon Veure Producció científica UPC; Benito, Elena; García Martín, Maria de Gracia; Galbis Pérez, Juan Antonio; Muñoz Guerra, Sebastián Veure Producció científica UPC
Data: 15-ago-2012
Tipus de document: Article
Resum: Random poly(hexamethylene terephthalate-co-galactarate) s and poly(dodecamethylene terephthalate-co-galactarate) s copolyesters covering the whole range of compositions were obtained with weight-average molecular weights of 30,000–50,000 g mol 1 by melt polycondensation. They were thermally stable above 300 C, and displayed Tg in the þ20 to 20 C range with values steadily decreasing with the content in galactarate units. All the copolyesters were semicrystalline with Tm between 50 and 150 C and those made from dodecanediol were able to crystallize from the melt at a crystallization rate depending on composition. Copolyesters containing up to 50% of galactaric units retained the crystal structure of their respective polyterephthalate homopolyesters, whereas they adopted the structure of the respective polygalactarates when the content in Galx units reached 70%. Stress-strain essays revealed decay in the mechanical parameters as the aromatic units were replaced by Galx. Incubation in aqueous buffer revealed that hydrolysis of the polyesters were largely enhanced by copolymerization and evidenced the capacity of the Galx unit for making aromatic polyesters susceptible to biodegradation. A detailed NMR analysis complemented by SEM observations indicated that hydrolysis took place by preferred splitting of galactarate ester bonds with releasing of alkanediol and Galx-diacid.
ISSN: 0887-624X
URI: http://hdl.handle.net/2117/16205
DOI: 10.1002/pola.26128
Versió de l'editor: http://onlinelibrary.wiley.com/doi/10.1002/pola.26128/abstract
Apareix a les col·leccions:Altres. Enviament des de DRAC
POL - Polímers. Articles de revista
Departament d'Enginyeria Química. Articles de revista
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