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Abstract(s)
Face á grande preocupação ambiental que tem surgido nos últimos anos, e a necessidade de substituir os polímeros provenientes do petróleo, têm sido estudados os compósitos reforçados com fibras naturais, como alterativa amiga do ambiente. Estes compósitos têm como aplicação na indústria automóvel, aeroespacial, onde é necessário fazer uma redução do peso dos componentes.
No presente trabalho, pretende-se estudar a influencia que as fibras de linho e de coco têm no aumento da resistência dos compósitos reforçados com estas, à flexão e à tração. Na literatura são sugeridas várias técnicas para melhorar as propriedades das fibras, portanto, neste estudo foi testado um tratamento químico, alcalino com NaOH, e uma técnica física, de disposição das fibras em forma de rede.
Após análise dos resultados, verificou-se que a percentagem de enchimento é a propriedade com maior influência para aumento das propriedades mecânicas estudadas. Por outro lado, verificou-se que a utilização do tratamento alcalino não fez diferença nos ensaios de tração das fibras de linho. Quando à aplicação das fibras em rede, estas obtiveram ainda piores resultados, ao contrário do esperado.
Verificou-se que as combinações ideais alteram de ensaio para ensaio.
Given the great environmental concern that has arisen in recent years, and the need to replace petroleum-based polymers, composites reinforced with natural fibers have been studied as an environmentally friendly alternative. These composites have applications in the automotive and aerospace industries, where it is necessary to reduce the weight of the components. In the present work, we intend to study the influence that flax and coir fibers have in increasing the flexural and tensile strength of composites reinforced with them. In the literature several techniques are suggested to improve the properties of the fibers, therefore, in this study a chemical treatment, alkaline with NaOH, and a physical technique, of arranging the fibers in a network form, were tested. After analyzing the results, it was found that the percentage of filler is the property with the greatest influence for increasing the mechanical properties studied. On the other hand, it was found that the use of the alkaline treatment made no difference in the tensile tests of the flax fibers. When it came to the application of the networked fibers, they obtained even worse results, contrary to what was expected. It has been found that the ideal combinations change from trial to trial.
Given the great environmental concern that has arisen in recent years, and the need to replace petroleum-based polymers, composites reinforced with natural fibers have been studied as an environmentally friendly alternative. These composites have applications in the automotive and aerospace industries, where it is necessary to reduce the weight of the components. In the present work, we intend to study the influence that flax and coir fibers have in increasing the flexural and tensile strength of composites reinforced with them. In the literature several techniques are suggested to improve the properties of the fibers, therefore, in this study a chemical treatment, alkaline with NaOH, and a physical technique, of arranging the fibers in a network form, were tested. After analyzing the results, it was found that the percentage of filler is the property with the greatest influence for increasing the mechanical properties studied. On the other hand, it was found that the use of the alkaline treatment made no difference in the tensile tests of the flax fibers. When it came to the application of the networked fibers, they obtained even worse results, contrary to what was expected. It has been found that the ideal combinations change from trial to trial.
Description
Mestrado em IPB-ESTG
Keywords
Great environmental Petroleum-based polymers Automotive Aerospace industries NaOH