Autor(a/res): BR Moura; GE Oliveira; RD Toledo Filho; FGS Junior.

Resumo: As well known, the fibers can be used as mechanical reinforcement fillers in the composites. In the specific case of vegetable fibers in cementitious matrices, there are some concerns about low adhesion on the matrix, high water absorption by the fiber and low durability in alkaline media, which can be improved by some chemical treatments on the fiber surface. This present work aim to evaluate a single coating of a magnetite layer and a double coating of polyaniline layer and magnetite layer on the mango seed fiber surface. These coating aimed to get better the fiber/matrix adhesion as well as to promote a chemical protection of the fiber. The natural and coated mango seed fibers were characterized by FTIR and TGA, to evaluate the coating process result. The morphology of the composites presents no change using natural or coated fibers. The mechanical properties of the composites containing the fibers, natural and coated, were determined by compression tests. The fibers presence, independent on the surface treatment, got better the all composites mechanical properties. On the other hand, the composite with 0.5% of double coated fibers had similar young’s modulus than natural fiber, associated the chemical protection on the fiber.

Acesse AQUI e confira o artigo.