Análise do comportamento mecânico e térmico de biocompósitos à base de polipropileno e fibras de curauá e a influência do seu reprocessamento nas propriedades mecânicas e físicas
This thesis presents an approach on the recycling process of a curauá (0%, 10% and 30%) reinforced polypropylene matrix biocomposite, where they have undergone five recycling cycles (reprocessing) in a machine of the type extruder. Analyzes of fluidity index, thermal analysis (softening temperatu...
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| Formato: | doctoralThesis |
| Idioma: | pt_BR |
| Publicado em: |
Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/26937 |
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| Resumo: | This thesis presents an approach on the recycling process of a curauá (0%, 10%
and 30%) reinforced polypropylene matrix biocomposite, where they have undergone five
recycling cycles (reprocessing) in a machine of the type extruder. Analyzes of fluidity
index, thermal analysis (softening temperature and thermogravimetric analysis) and
mechanical test of flexion in three points were performed. Both analyzes were carried out
in samples at room temperature and in samples that were passed for a period of 14 days
in a greenhouse at a temperature of 120 ° C, to analyze the heat interference in the
biocomposite and the recyclability of the same. After a comparative analysis between the
studied states, it was observed that the biocomposites with 30% of reinforcement have a
greater modulus of elasticity and present greater resistance to flexion. For materials that
passed through the greenhouse period, they achieved higher values of stiffness and
strength compared to material that did not have this conditioning. When the comparative
analysis of the properties and thermal characteristics of the materials is carried out, an
improvement in the softening temperature and a positive displacement of the tg curve is
observed for all the compositions studied here. From a general analysis, this thesis proves
the viability of the recycling of the biocomposite, once it is conditioned to the greenhouse at
120 ° C for the period of 14 days. |
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