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Enhanced general analytical equation for the kinetics of the thermal degradation of poly(lactic acid) driven by random scission
Carrasco Alonso, Félix Ángel; Perez Maqueda, L.A.; Sanchez Jimenez, P.E.; Perejón, A.; Santana Pérez, Orlando Onofre; Maspoch Rulduà, Mª Lluïsa
Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. POLYCOM - Polimers i compòsits: tecnologia
An enhanced general analytical equation has been developed in order to evaluate the kinetic parameters of the thermal degradation of poly(lactic acid) (PLA) at various linear heating rates and at constant rate conditions. This improvement consisted of replacing the n-order conversion function by a modified form of the Sestak-Berggren equation f(α) = c(1−α)nαm, which led to better adjustment of experimental data, and also adequately represented the conventional mechanisms for solid-state processes. The kinetic parameters so obtained have been compared to those determined by conventional differential and isoconversional methods. Given that the thermal degradation of PLA has been argued to be caused by random chain scission reactions of ester groups, the conversion function (α) = 2(α1/2−α), corresponding to a random scission mechanism, has been tested.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria dels materials
Thermoplastics
Poly(lactic acid)
Thermal degradation
Enhanced kinetic model
General analytical equation
Random scission
Termoplàstics
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
info:eu-repo/semantics/publishedVersion
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