AesumoOs compósitos obtidos a partir de fibras de bagaço de cana-de-açúcar e polímeros reciclados (PEAD e PS) foram obtidos através da técnica de extrusão a quente e o planejamento fatorial possibilitou a análise dos fatores que influenciam a obtenção dos compósitos. As amostras contendo polietileno de alta densidade (PEAD), tanto com 30% como com 50% de fibras, mostraram-se mais impermeáveis na presença da água que as amostras obtidas com poliestireno (PS). Os compósitos obtidos com PEAD apresentaram resistência à flexão com uma tensão máxima aplicada de 45 MPa (50% de fibra) e de 39MPa (30% de fibra), esses valores são maiores que os apresentados pelos materiais obtidos com PS. Compósitos de polímeros e madeira (com 60% de serragem) apresenta resistência à flexão de aproximadamente 32 MPa e o MDF apresenta uma resistência à flexão de 36 MPa, esses resultados mostram que os compósitos obtidos possuem uma boa resistência a flexão. Palavras-chaves: compósitos, material reciclável, fibras naturais, técnica de extrusão. AbstractThe composites were obtained through hot extrusion of a mixture of recycled polymers (HDPE and PS) and sugar cane fibers. The extrusion technique resulted in homogeneous materials with good mechanical properties and the factorial design allowed the analysis of the factors that influence the process. Samples containing high density polyethylene (HDPE), both with 30% and 50% fibers were shown to be significantly more effective compared to polystyrene (PS) aiming at impermeability in the presence of water. The composites obtained with HDPE showed bending resistance, with 45 MPa (50% fiber) and 39MPa (30% fiber) maximum applied stress, these values are higher than those presented in the composites obtained with PS. Composites of polymers and wood (60% of sawdust) provide bending resistance of about 32 MPa and MDF has a bending resistance of 36 MPa, these results show that the compounds obtained have a good bending resistance.
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