dc.contributorCanevarolo Júnior, Sebastião Vicente
dc.contributorhttp://lattes.cnpq.br/4153664441338178
dc.contributorhttp://lattes.cnpq.br/0005558843039794
dc.creatorHamester, Letícia Sausen
dc.date.accessioned2016-09-27T20:10:49Z
dc.date.available2016-09-27T20:10:49Z
dc.date.created2016-09-27T20:10:49Z
dc.date.issued2014-01-30
dc.identifierHAMESTER, Letícia Sausen. Desenvolvimento de um colorímetro in-line para o monitoramento da extrusão de polímeros. 2014. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2014. Disponível em: https://repositorio.ufscar.br/handle/ufscar/7558.
dc.identifierhttps://repositorio.ufscar.br/handle/ufscar/7558
dc.description.abstractThis work shows the development, construction, validation and application of an in-line colorimeter used for real time color quantification of the melted flow during polymer processing in the extruder. The device uses a set of four colored LED’s, red (R), green (G), blue (B) and white (W), that intermittently and sequentially illuminate the melt flow with its intensity transmitted through the flow and quantified by a single photocell. At first the device was validated in bench using aqueous colored solutions and later in the extruder during processing, using known concentrations of the acid dye diluted in polymer. The device was able to quantify with precision and in real time the attenuation of the different wavelengths emitted by each LED, caused by the presence of chromophore groups in the melted flow. It was successful to use to monitor in real time the degradation of polypropylene submitted to multiple extrusions. Degradation was proven through off-line analyses of multiprocessed polypropylene via rheometry and spectroscopy absorption on UV-visible. It was also used to quantify color in the melted mixture of polypropylene/montmorillonite (PP/MMT) to obtain nanocomposites. Using hue and luminosity parameters of the color it was possible to follow oxidation of iron ions present as impurity in the clay structure, determining which clays were better suited to these nanocomposite production.
dc.languagepor
dc.publisherUniversidade Federal de São Carlos
dc.publisherUFSCar
dc.publisherPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM
dc.publisherCâmpus São Carlos
dc.rightsAcesso aberto
dc.subjectPolímeros
dc.subjectMonitoramento in-line
dc.subjectColorimetria
dc.titleDesenvolvimento de um colorímetro in-line para o monitoramento da extrusão de polímeros
dc.typeTesis


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