Examinando por Autor "Paternina reyes, María José"

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    Caracterización química, física y mecánica de materiales compuestos con matriz de ácido poliláctico y refuerzo particulado de cáscaras de marañón elaborados a través de la técnica de moldeo por deposición fundida
    (2023-02-22) Paternina reyes, María José; Espitia Sanjuán, Luis Armando; Colorado Lopera, Henry Alonso
    In this work, composite materials with polylactic acid matrix were made, varying the percentages of cashew shell particles 0.5%, 1% and 2% using the fused deposition molding (FDM) technique; The cashew shells were dried at 250ºC and crushed mechanically, using particles with a size smaller than 63 um to manufacture them. Polylactic acid and cashew shells were characterized by FTIR, scanning electron microscopy, thermogravimetric analysis, lignocellulosic analysis, and for the composite materials obtained, mechanical tests were carried out to obtain tensile and flexural mechanical properties according to ASTM D638 and ASTM D790 standards, In addition to the analyzes of the fractures obtained in each test. It was found that the shell has the presence of hemicellulose, cellulose and lignin, in addition to other minerals present in smaller quantities. The drying process at 250ºC managed to eliminate the anacardic acid present in the cashew shell. It was evidenced that the composite materials with 0.5% cashew shell particles had higher values of modulus of elasticity and tensile strength, however, in the yield stress, the 1% composite materials presented the highest properties. On the other hand, in bending, an increase in bending resistance was observed as the percentage of added particles increased.