ResumoApresenta-se o estudo de viabilidade de utilização, como reforço em materiais compósitos poliméricos, de resíduos originados da manufatura dos painéis de MDF (Medium Density Fiberboard), avaliando seu potencial como alternativa em substituição a cargas minerais para aplicação industrial. A escolha da resina poliéster ortoftálica foi motivada pelas suas propriedades e principalmente pelo seu baixo custo e facilidade de aquisição. Diferentes frações mássicas (m) de adição de resíduo em resina poliéster ortoftálica foram estudadas: 0, 10, 15 e 20%. As propriedades analisadas foram: resistência mecânica, absorção de água e grau de cristalinidade. Os resultados mostram a diminuição das propriedades mecânicas em até 53%, no índice de cristalinidade em até 18% e aumento no índice de absorção de água em quase cinco vezes para o compósito de maior adição de resíduo (C20). Palavras-chave: compósitos poliméricos, resíduos de MDF, resina poliéster ortoftálica, resistência mecânica, índice de cristalinidade. AbstractThe study examines the feasibility of using MDF (Medium Density Fiberboard) waste as reinforcement in orthophthalic polyester resin, evaluating its potential as an alternative to mineral filler for industrial applications. The orthophthalic resin was chosen because it's good performance, low cost and easily obtainable. Three composite compositions were prepared containing different amount of waste MDF (10, 15 and 20%). The mechanical properties, degree of crystallinity and water absorption of the resin and its respective composites were evaluated. The results show a decrease in mechanical strength and crystallinity index followed by an increase in water absorption index caused by poor adhesion in the region of the polymer matrix fiber interface.

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Abstract:The science space in a state school in Natal city was built using a composite consisting of gypsum, EPS (expanded polystyrene), shredded tire, cement and water. Mechanical and thermal resistances were evaluated. Inside the blocks, three types of fillings (EPS plates, aluminum cans and 500 mL bottles of mineral water) were placed in order to obtain a walls with higher thermal resistance, but also to give it an ecologically correct order, considering that both the tire and the EPS occupy a large space in landfills and require years to be degraded when released into the environment. Compression tests were conducted according to the rules. The experiments demonstrated that the temperature difference between the internal and external surfaces on the walls reached levels above 12.0 °C. It was also demonstrated that the proposed composite has adequate mechanical strength to be used for sealing walls. The proposed use of the composite can contribute to reduce the significant housing deficit of Brazil, producing popular houses at low cost and with little time to work.

The growing demand for panels of Medium Density Fiberboard (MDF) for manufacture offurniture produces significant quantities of waste, which is often inappropriate discarded. This paperpresents the study of the characterization of a polymeric matrix composite reinforced with powderedMDF residues collected from cuts machines for furniture manufacturing. Samples of the compositeshaving waste mass fractions (m) in the range of 0-20% in resin Terephthalic (E) were studied. Throughmechanical and physical tests the maximum tensile and flexural strength, modulus of elasticity,maximum deformation, composite density and water absorption index were determined. A result ofcharacterization tests confirms the viability of composite when compared to others composites usingnatural fibers as reinforcement or load.

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