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Kinetic study of the thermal and thermo-oxidative degradations of polylactide-modified films for food packaging

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Abstract

In this study, the thermal degradations of some commercial polylactide (PLA) films, pure and subjected to various superficial treatments, were investigated in both inert (flowing nitrogen) and oxidative (static air) atmospheres. Degradations were carried out in a thermobalance, in the scanning mode, at various heating rates, and the obtained thermogravimetric curves were discussed and interpreted. Experiments, performed in the temperature range of 35–700 °C, showed similar behavior in both the atmospheres used. The initial decomposition temperature (T i) and the apparent activation energy (E a) of degradation of the differently treated PLA films were determined and compared with each other and with those of untreated PLA. The E a of degradation was obtained by Kissinger’s method, and the values were found increased linearly as a function of crystallinity percentage (%c) as well as the T i values. The glass transition temperature (T g) was also determined by differential scanning calorimetry. All the investigated parameters showed dependence on different treatments made to the films. The results obtained for the degradations of PLA films were compared with each other, and a classification of thermal stability in the studied environments were made.

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  1. Department of Industrial Engineering, University of Catania, V.le A. Doria, 6, 95125, Catania, Italy

    I. Blanco & V. Siracusa

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  2. V. Siracusa
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Blanco, I., Siracusa, V. Kinetic study of the thermal and thermo-oxidative degradations of polylactide-modified films for food packaging. J Therm Anal Calorim 112, 1171–1177 (2013). https://doi.org/10.1007/s10973-012-2535-8

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  • DOI: https://doi.org/10.1007/s10973-012-2535-8

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