¿Compromete el magnesio la procesabilidad a elevada temperatura de nuevos materiales compuestos biodegradables y biorreabsorbibles de PLLA/Mg?

Sandra C. Cifuentes; Rosario Benavente; José Luis González-Carrasco

doi:10.3989/revmetalm.011

Autores/as

Sandra C. Cifuentes Centro Nacional de Investigaciones Metalúrgicas (CENIM), CSIC - Instituto de Ciencia y Tecnología de Polímeros (ICTP), CSIC
Rosario Benavente Instituto de Ciencia y Tecnología de Polímeros (ICTP), CSIC
José Luis González-Carrasco Instituto de Ciencia y Tecnología de Polímeros (ICTP), CSIC - Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN)

DOI:

https://doi.org/10.3989/revmetalm.011

Palabras clave:

Ácido poli-L-láctico, Magnesio, Materiales biodegradables, Materiales compuestos reforzados con partículas

Resumen

Este trabajo aborda la influencia de magnesio en el comportamiento a fusión y en la estabilidad térmica de nuevos compuestos de PLLA / Mg biorreabsorbibles como una forma de investigar su procesabilidad mediante técnicas convencionales, lo que probablemente requerirá una etapa en estado fundido a alta temperatura para moldear el material mediante el uso de una etapa de compresión, extrusión o inyección. Para este fin, los materiales de PLLA cargados con partículas de magnesio, de diferentes tamaños y fracción de volumen, se prepararon por la técnica de disolución y colada, evitando así el procesado a alta temperatura antes del análisis. El análisis mediante DSC, DSC modulada y termogravimetría demuestra que, aunque la estabilidad térmica de PLLA se reduce, el intervalo de temperatura para su procesado por rutas convencionales es suficientemente amplio. Además, las partículas de magnesio no alteran la cristalización del polímero a partir del fundido, lo que permitirá optimizar el grado de cristalinidad mediante tratamientos posteriores de recocido y conseguir así una adecuada combinación de propiedades mecánicas y velocidad de degradación.

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