|Títol: ||Influence of degradation on the crystallization behaviour of a biodegradable segmented copolymer constituted by glycolide and trimethylene carbonate units|
|Autor: ||Franco García, María Lourdes|
Rodríguez Galán, Rafael Alfonso
Puiggalí Bellalta, Jordi
|Altres autors/autores: ||Universitat Politècnica de Catalunya. Departament d'Enginyeria Química|
|Matèries: ||Àrees temàtiques de la UPC::Enginyeria química|
|Tipus de document: ||Article|
|Descripció: ||The influence of degradation on non-isothermal crystallization from the melt of a segmented copolymer
constituted of glycolide and trimethylene carbonate units and used as a bioabsorbable surgical suture
was studied by optical microscopy, differential scanning calorimetry and time-resolved X-ray diffraction.
Fibrillar positive spherulites were obtained with slightly degraded samples but new axialitic morphologies
were detected when samples had a molecular weight, Mw, lower than 29,000 g/mol and the
crystallization started at a high temperature.
Crystal growth kinetics of samples degraded under different conditions was evaluated over a wide
temperature range by a non-isothermal method. Two crystallization regimes (I and II) were determined
for the more degraded samples (i.e., those able to crystallize according to axialitic and spherulitic
morphologies), whereas only regime II was found for samples of higher molecular weights. Primary
nucleation density decreased with the extent of degradation provided no morphological changes
occurred, and so did the regularity of lamellar stacking, as shown by synchrotron measurements,
although the morphological parameters remained practically constant.|
|Altres identificadors i accés: ||Franco, M.; Rodriguez, R.; Puiggali, J. Influence of degradation on the crystallization behaviour of a biodegradable segmented copolymer constituted by glycolide and trimethylene carbonate units. "Polymer degradation and stability", Desembre 2010, vol. 95, núm. 12, p. 2376-2387.|
|Disponible al dipòsit:||E-prints UPC|
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