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Enhanced general analytical equation for the kinetics of the thermal degradation of poly(lactic acid)/montmorillonite nanocomposites driven by random scission

Opened Access Enhanced general analytical equation for the kinetics of the thermal degradation of poly(lactic acid)/montmorillonite nanocomposites driven by random scission

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Autor: Carrasco, F.
Pérez Maqueda, Luis Allan
Santana, O. O.
Maspoch, María Luisa
Departamento: Universidad de Sevilla. Departamento de Química Inorgánica
Fecha: 2014
Publicado en: Polymer Degradation and Stability, 101, 52-59.
Tipo de documento: Artículo
Resumen: An enhanced general analytical equation has been developed in order to evaluate the kinetic parameters of the thermal degradation of nanocomposites, composed of poly(lactic acid) (PLA) and organo-modified montmorillonite (OMMT) nanoparticles. This improvement has consisted of replacing the n-order conversion function by a modified form of the Sestak-Berggren equation f(α) = c (1 - α)nαm that led to a 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 f(α) = L (L - 1)x(1 - x)L-1, corresponding to a random scission mechanism, has been tested. Once optimized the kinetic model, the thermal degradation kinetics of nanocomposites (0.5 and 2.5%...
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Cita: Carrasco, F., Pérez Maqueda, L.A., Santana, O.O. y Maspoch, M.L. (2014). Enhanced general analytical equation for the kinetics of the thermal degradation of poly(lactic acid)/montmorillonite nanocomposites driven by random scission. Polymer Degradation and Stability, 101, 52-59.
Tamaño: 1.563Mb
Formato: PDF

URI: http://hdl.handle.net/11441/68337

DOI: 10.1016/j.polymdegradstab.2014.01.014

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