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Influence of Thermal Aging on the Sliding Wear of a Biocomposite Material Reinforced with Bamboo Fibers
Influencia del envejecimiento térmico sobre el desgaste deslizante de un material biocompuesto reforzado con fibras de bambú
DOI:
https://doi.org/10.15446/ing.investig.107624Keywords:
polypropylene, natural fiber, bamboo, biocomposite, tribology, sliding wear, wear rate, coefficient of friction, aging (en)polipropileno, fibra natural, bambú, biocompuesto, tribología, desgaste deslizante, tasa de desgaste, coeficiente de fricción, envejecimiento (es)
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This study evaluated the effect of thermal aging on the tribological properties of biocomposites formed by an isotactic polypropylene matrix (iPP) reinforced with 20 wt% (PP/20F), 30 wt% (PP/30F), and 40 wt% (PP/40F) of randomly oriented bamboo fibers. iPP, along with the grafting of maleic anhydride molecules (MAPP), was used as a coupling agent. The accelerated thermal aging involved the continuous heating of the materials at 98 °C for 10 days. Wear tests were performed under the Pin-on-Disk configuration to determine the wear factor (K) and the friction coefficient (µ) of the materials. After thermal aging, the µ value of the PP/20F composite increased by 40.5%, while, for raw PP, PP/30F, and PP/40F, the increase was 2.1, 7.5, and 2.2%, respectively. The aged PP/30F composite achieved the highest µ value. The loss of wear resistance due to aging was more prominent in the raw PP. The K factor of the aged and unaged PP/20F was the lowest. The use of scanning electron microscopy allowed identifying that adhesive, abrasive, and fatigue wear mechanisms were the dominant ones.
En este estudio se evaluó el efecto del envejecimiento térmico sobre las propiedades tribológicas de biocompuestos formados por una matriz de polipropileno isotáctico (iPP) reforzada con 20 wt% (PP/20F), 30 wt% (PP/30F) y 40 wt% (PP/40F) de fibras de bambú orientadas al azar. Se utilizó iPP con injertos de moléculas de anhídrido maleico (MAPP) como agente de acople. El envejecimiento térmico acelerado consistió en un calentamiento continuo de los materiales a 98 °C durante 10 días. Se realizaron ensayos de desgaste bajo la configuración Pin-on-Disk para determinar el factor de desgaste (K) y el coeficiente de fricción (µ) de los materiales. Después del envejecimiento térmico, el valor de µ del compuesto PP/20F aumentó en un 40.5 %, mientras que, para el PP puro, PP/30F y PP/40F, el aumento fue de 2.1, 7.5 y 2.2 % respectivamente. El compuesto PP/30F envejecido alcanzó el mayor valor de µ. La pérdida de la resistencia al desgaste debido al envejecimiento fue más resaltante en el PP puro. El factor K del PP/20F envejecido y no envejecido fue el más bajo. El uso de microscopía electrónica de barrido permitió identificar que los mecanismos de desgaste adhesivo, abrasivo y por fatiga fueron los dominantes.
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Copyright (c) 2024 Eudi Blanco, Jorge Fajardo, Edwuin Carrasquero, Caribay Urbina, Luis López, Luis Cruz
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