Evaluación de las propiedades térmicas de la mezclas PLA/SEBS con moringa sometida a degradación en un entorno marino
DOI:
https://doi.org/10.33448/rsd-v10i4.13249Palabras clave:
PLA; SEBS; Polvo de hoja de moringa oleifera; Entorno marino simulado.Resumen
En este trabajo, se investigó la influencia del contenido de SEBS y Moringa Oleifera en la propiedades termales de mezclas PLA/SEBS y de dos biocompuestos basados en dos de estas mezclas. Se prepararon dos mezclas de PLA/SEBS (90/10 y 70/30), dos biocompuestos de PLA/SEBS/MO (90/10/1 y 70/30/1), y un biocompuesto PLA / MO (100/1), mezclando en estado fundido en una extrusora de matriz abierta. Las muestras para biodegradación se obtuvieron mediante prensado en caliente, siendo posteriormente insertadas en un ambiente marino simulado. La evolución de la degradación se evaluó mediante termogravimetría y calorimetría exploratoria diferencial. Se observó un aumento en la cristalinidad de todas las composiciones evaluadas y una reducción de la estabilidad térmica después de la exposición al medio marino por períodos prolongados. Esta mayor cristalinidad puede estar relacionada con el consumo de regiones amorfas y la menor estabilidad térmica está ligada a la degradación hidrolítica del PLA, debido al agua absorbida por la moringa en polvo. La evaluación de la variación de masa mostró que las mezclas con SEBS y Moringa, presentaron una tasa de degradación equivalente o menor a la reportada para PLA puro.
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Derechos de autor 2021 Jéssica Camilla da Costa Lima; Rosmary Nichele Brandalise; Yêda Medeiros Bastos de Almeida; Tomás Jeferson Alves de Melo; Glória Maria Vinhas
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