COMPÓSITOS À BASE DE RESINA EPÓXI REFORÇADOS COM FIBRA DE COCO / COMPOSITES BASED ON EPOXY RESIN REINFORCED WITH COCONUT FIBER

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

Polymer composites reinforced with fibers are of great interest in the automotive industry, with emphasis to epoxy resin reinforced with glass fibers However, these fibers exhibit abrasive behavior causing wear of equipment, making it susceptible to the loss of properties due to the breakdown of fibers during processing, high cost of manufacturing. In turn, the interest of companies and researchers for composite alternatives, using renewable resources, having a low cost and being biodegradable, has increased. The use of vegetable fibers in thermosetting in commercial applications has been promising, considering that they are not toxic, have low cost, are renewable sources and meet the demands of environmental preservation. In addition, the vegetable fibers are not abrasive to processing equipment and create composites with low susceptibility to loss of properties during processing. Among the wide variety of existing plant fibers, coir (coconut product), abundant in the state of Sergipe, with an average diameter of 0.25 mm and lower density than the glass fibers, it was studied as a strengthening component in the epoxy matrix (DGEBA), at the levels of 0, 10, 20 and 30% by weight, continuous and randomly oriented. These composites were tested in tension and bending and their surface examined by scanning electron microscopy (SEM). Among the properties evaluated, the increase in the level of reinforcement caused a significant increase in the tensile strength and bending modulus of the composites compared to pure resin. The microstructural observations revealed the failure mechanisms that can occur during fracture, and that the area of natural coconut fiber contributes to good adhesion with DGEBA (diglycidyl ether of bisphenol A).

ASSUNTO(S)

fibra de coco resina epóxi composites epoxy resin polímeros engenharia de materiais e metalurgica polymers coconut fiber compósitos

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