ResumoNeste estudo, caracterizações morfológicas e mecânicas foram utilizadas em fibras de coco brasileiras na condição como recebida e tratadas superficialmente (por NaOH, aquecidas e por NaOH seguido de aquecimento) e em mantas de fibras de coco fabricadas por compressão. Para a análise morfológica foi utilizada a Microscopia Eletrônica de Varredura (MEV) e para a análise mecânica foi utilizado o ensaio de tração uniaxial. As análises por MEV apresentaram que as fibras tratadas por NaOH possuem paredes celulares externas mais nítidas e partículas circulares com diâmetros de aproximadamente 10 μm. O tratamento químico alterou a parede externa das fibras de coco; em uma das amostras foram vistas microtrincas da ordem de 7 a 60 µm em virtude do tratamento seguido de aquecimento. O módulo inicial (módulo de elasticidade) e a tensão de ruptura diminuíram com o aumento de diâmetro nas quatro condições de fibras de coco estudadas. A geometria e a massa da manta de fibra de coco influenciaram no seu comportamento mecânico. Palavras-chave: Fibra de coco; Comportamento morfológico; Comportamento mecânico. MORPHOLOGICAL AND MECHANICAL BEHAVIOR OF COCONUT FIBERS TREATED SUPERFICIALLY AND COCONUT FIBERS MATS AbstractNatural fibers has recently gained attention due to low environmental impact, low cost and easy availability. Morphological and mechanical investigations on Brazilian coconut fibers in four different surface conditions (as received; dried; chemically treated by NaOH; chemically treated by NaOH followed by heating) and coconut fiber mats manufactured by compression were used in this study. Scanning Electron Microscopy (SEM) were used to morphological analysis and in-situ mechanical testing uniaxial traction were used. SEM analysis showed the chemically treated coconut fibers have sharper external cell walls and circular particles with diameters of approximately 10 µm. Chemical treatment altered the external wall of coconut fibers; on one of the samples were seen microcracks order 7 to 60 µm due to the treatment followed by heating. The initial modulus (modulus of elasticity) and tensile strength decreased with increasing diameter for the four conditions of coconut fibers. The geometry and the weight of the coconut fiber mats influenced their mechanical behavior.
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