Abstract
Natural lignocellulosic fibers are successfully replacing synthetic fibers as the reinforcement phase of composite materials in many engineering applications, including automobile parts. In addition to well-known conventional lignocellulosic fibers, others with promising properties, like that obtained from the leaves of the curaua plant (Ananas erectifolius) found in the Amazon region of Brazil, are now being considered. The present work investigated microstructural aspects associated with the performance of curaua fibers in pullout tests carried out to characterize the fibers interfacial strength with a polyester matrix. The results have shown that the naturally bonded filaments that constitute a curaua fiber present interspatial voids between them. These voids play an important role in providing adherence of the fiber surface to a polyester matrix, resulting in an effective reinforcement for a curaua-strengthened composite.
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