Polyurethanes are polymers prepared from the reaction between polyfunctional isocyanates and polyols, containing intramolecular urethane bonds. The thermosetting polyurethane (PUR) is a non-biodegradable polymer, that cannot be reprocessed by melting, so that the waste generated becomes an environmental problem. The objective of this study was to produce and characterize thermoplastic polyurethane (TPU) composites incorporated with rigid polyurethane particles through the extrusion process, as an alternative for the reuse of the PUR and improvement of the TPU properties. Extruded composites with 10%, 20% and 30% in weight were thermopressed and had their morphological, thermal and mechanical properties analyzed. The composite with 20% of filler (TPU/PUR20%) presented the best results, with an increase of 117% in the elastic modulus and 79% in the yield stress when compared to the pure matrix (TPU/PUR0%). No additional increment of the mechanical properties was observed to the composite with 30% of PUR (TPU/PUR30%), probably because of the greater heterogeneity of this composite, related to the difficulty of dispersion and distribution of the high content of the PUR particles in the matrix. This study presented a viable alternative for the use and value aggregation of the thermoset polyurethane residue, contributing to minimize environmental impacts and to improve the properties of thermoplastic polyurethane.
RESUMO O aço AISI 316L é muito aplicado como biomaterial de baixo custo em próteses e equipamentos cirúrgicos, dentre outras aplicações. Estas aplicações se devem à sua boa resistência à corrosão em presença de meios contendo fluidos corporais. Muito embora o aço apresente as características mencionadas, estas poderão ser comprometidas com a formação de martensita alfa linha (fase magnética) induzida por deformação a frio. Neste caso, o presente trabalho, teve como objetivo investigar os efeitos de laminação a frio no surgimento de fase martensítica. Para tanto foram realizadas três diferentes deformações. A chapa como recebida e as amostras deformadas foram submetidas a ensaios de ferritoscopia, microdureza Vickers e análise microestrutural por microscopia eletrônica de varredura, MEV. Foi observado que nas amostras deformadas a frio houve o surgimento de fase magnética (provavelmente martensita alfa linha) e aumento da microdureza, devido ao encruamento e à presença de fases induzidas por deformação.
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