Enhanced general analytical equation for the kinetics of the thermal degradation of poly(lactic acid) driven by random scission |
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Authors: | F Carrasco LA Pérez-Maqueda PE Sánchez-Jiménez A Perejón OO Santana MLl Maspoch |
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Institution: | 1. Department of Chemical Engineering, Universitat de Girona, Campus Montilivi, s/n, 17071 Girona, Spain;2. Instituto de Ciencia de Materiales de Sevilla, C.S.I.C.-Universidad de Sevilla, C/Américo Vespucio n°49, 41092 Sevilla, Spain;3. Centre Català del Plàstic (CCP), Universitat Politècnica de Catalunya, C/Colom, 114, 08222 Terrassa, Spain |
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Abstract: | 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. |
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Keywords: | Poly(lactic acid) Thermal degradation Enhanced kinetic model General analytical equation Random scission |
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