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Soil Biodegradation of a Blend of Cassava Starch and Polylactic Acid
Biodegradación en suelo de una mezcla de almidón de yuca y ácido poliláctico
DOI:
https://doi.org/10.15446/ing.investig.93710Keywords:
Disintegration, Packing, Biopolymers, Soil, TPS/PLA (en)desintegración, empaque, biopolímeros, suelo, TPS/PLA (es)
This study evaluated bio-based blended films produced from polylactic acid (PLA) and thermoplastic starch (TPS) under soil conditions for four weeks (W). The degradation of the film was evaluated in addition to thermal, structural, and morphological changes on the surface of the material. There were evident structural changes; the TPS present in the film degraded from weeks 0 to 4, exhibiting a loss of mass between 350 and 365 °C in the TGA test. This behavior was attributed to the condensation of hydroxyl groups of the cassava starch as well as to a loss of mass corresponding to the degradation of PLA between 340 and 350 °C. The addition of TPS in the PLA-containing matrix resulted in a decrease in the Tg of the PLA/TPS blends. The increase in crystallinity improved the water vapor permeability in the structure. Consequently, the incorporation of starch in these blends not only reduces the cost of the material, but it also contributes to its rapid biodegradation (68%). These results contribute and offer new alternatives to accelerate the biodegradation process of biomaterials.
Este estudio evaluó películas de mezcla de base biológica producidas a partir de ácido poliláctico (PLA) y almidón termoplástico (TPS) bajo condiciones en suelo durante cuatro semanas (W). Se evaluó la degradación de la película, además de los cambios térmicos, estructurales y morfológicos de la superficie del material. Hubo cambios estructurales evidentes; el TPS presente en la película se degradó desde la semana 0 hasta la 4, mostrando una pérdida de masa entre 350 a 365 °C en la prueba de TGA. Este comportamiento se atribuyó a la condensación de grupos hidroxilos del almidón de yuca y a una pérdida de la masa correspondiente a la degradación del PLA entre 340 a 350 °C. La adición de TPS en la matriz que contiene PLA dio lugar a una disminución en la Tg de las mezclas de PLA/TPS. El incremento de la cristalinidad mejoró la permeabilidad al vapor de agua en la estructura. Por lo tanto, la incorporación de almidón en estas mezclas no solo reduce el coste del material, sino que también contribuye a su rápida biodegradación (68%). Estos resultados contribuyen y ofrecen nuevas alternativas para acelerar el proceso de biodegradación de los biomateriales.
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Copyright (c) 2022 Margarita del Rosario Salazar-Sánchez, Laura Isabel Delgado-Calvache, Juan Carlos Casas-Zapata, Héctor Samuel Villada Castillo, Jose Fernando Solanilla-Duque
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