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Títol: Thermal degradation studies on homopolymers and copolymers based on trimethylene carbonate and glycolide units
Autor: Diaz Celorio, Elena
Franco García, María Lourdes
Marquez, Yolanda
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
Polymers--Biodegradation
Polyglycolide
Poly(trimethylene carbonate)
Biodegradable polymers
Kinetic analysis
Thermogravimetric analysis
Thermal degradation
Polímers -- Biodegradació
Tipus de document: Article
Descripció: The non-isothermal degradation kinetics of poly(trimethylene carbonate) (PTMC) and polyglycolide (PGL) was investigated by thermogravimetric (TG and DTG) analysis in the temperature range between 50 and 550 °C at different heating rates (0.5–40 °C/min). Both homopolymers showed a complex multi-step degradation process. Kinetic analysis was successfully performed for the main degradation steps using the isoconversional Kissinger–Akahira–Sunose and Friedman methods. Activation energies of these steps were practically independent of the degree of conversion. The true kinetic triplets (E, A, f(α)) were determined by the Coats–Redfern method. The results clearly indicated that the two homopolymers mainly degraded by quite different mechanisms, i.e. A3 and F1, which may be associated with different depolymerization processes (e.g. decarboxylation or unzipping). Degradation of copolymers of trimethylene carbonate and glycolide with different chemical microstructures (i.e. random, blocky and segmented) and of blends with different percentages of both homopolymers was also studied. Interestingly, a deceleration and an acceleration for the decomposition of trimethylene carbonate and glycolide segments were observed, respectively. Specifically, the two-step degradation process of the blend with 50 wt% of each homopolymer was analyzed by the above methodologies. Kinetic data indicated that the main degradation process involved a different mechanism from that previously determined for PTMC and PGL, and that the activation energy was intermediate (i.e. EPTMC < EBlend < EPGL).
Altres identificadors i accés: Diaz, E. [et al.]. Thermal degradation studies on homopolymers and copolymers based on trimethylene carbonate and glycolide units. "Thermochimica acta", 20 Gener 2012, vol. 528, p. 23-31.
0040-6031
http://hdl.handle.net/2117/16526
10.1016/j.tca.2011.11.006
Disponible al dipòsit:E-prints UPC
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