Kinetic analysis of thermal degradation of biodegradable and biobased PLA/PHB blends
Keywords:
Poly(lactic acid), Poly(3-hydroxybutyrate), Biodegradable polymers, Kinetic analysis, Thermal degradationAbstract
In this study, the thermal stability and thermal degradation kinetics of poly(lactic acid)/poly(3-hydroxybutyrate) (PLA/PHB) blends, with a mass ratio of 70:30, were investigated using thermogravimetric analysis (TGA) under a nitrogen atmosphere at four different heating rates (5, 15, 30, and 50 °C/min). The thermogravimetric curves indicated two-step degradation processes for the polymer blends, suggesting immiscibility or partial miscibility between them. Degradation kinetic parameters were studied in the temperature range of 30 to 550 °C using the isoconversional methods of Kissinger-Akahira-Sunose (KAS) and Vyazovkin under non-isothermal conditions. An improvement in the thermal stability of the polymers upon blending was observed, as evidenced by higher activation energies for PLA and PHB in the blended materials.
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Copyright (c) 2024 Magdalena L. Iglesias-Montes, David A. D’Amico, Luciana B. Malbos, Irene T. Seoane, Liliana B. Manfredi, Viviana P. Cyras
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.