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Títol: Thermal stability studies on clay nanocomposites prepared from a degradable poly(ester amide) constituted by glycolic acid and 6-aminohexanoic acid
Autor: Morales Gámez, Laura Teresa
Franco García, María Lourdes
Puiggalí Bellalta, Jordi
Altres autors/autores: Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. PSEP - Polimers Sintètics: Estructura i Propietats. Polimers Biodegradables.
Matèries: Àrees temàtiques de la UPC::Enginyeria química
Nanocomposites (Materials)
Polymers
Polímers -- Biodegradació
Polímers -- Propietats tèrmiques
Nanotecnologia
Tipus de document: Article
Descripció: An intercalated nanocomposite of the organically modified montmorillonite Cloisite C25A and a degradable poly(ester amide) based on glycolic acid and 6-aminohexanoic acid units (poly(glc-alt-amh)) was prepared using a twin-screw co-rotating extruder. The non-isothermal degradation kinetics was investigated by thermogravimetric analysis (TG and DTG) in the temperature range of 50–600 ◦C at five heating rates (2, 5, 10, 20 and 40 ◦C/min) and compared with the neat polymer. Significant differences were found since the nanocomposite showed three degradation steps instead of the two decomposition processes detected in the pristine sample. The onset mass loss temperature decreased in the nanocomposite due to the presence of the organo-modifier compound, but the presence of the silicate layers significantly decreased the degradation rate at the last stages of decomposition. Kinetic analysis was performed using the Kissinger method and the isoconversional (Kissinger–Akahira–Sunose and Friedman) methods. The true kinetic triplets (E, A, f(˛)) were determined for the first two steps of degradation through the Coats–Redfern and the Invariant Kinetic Parameters methods. The results clearly indicated that the presence of the organo-modified clay modified the mechanisms of degradation.
Peer Reviewed
Postprint (published version)
Altres identificadors i accés: Morales-Gámez, L.; Franco, M.; Puiggali, J. Thermal stability studies on clay nanocomposites prepared from a degradable poly(ester amide) constituted by glycolic acid and 6-aminohexanoic acid. "Thermochimica acta", Gener 2011, vol. 512, núm. 1-2, p. 142-149.
0040-6031
http://hdl.handle.net/2117/11657
Disponible al dipòsit:E-prints UPC
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