Estratégias para melhoramento das propriedades mecânicas de compósitos baseados em cortiça aglomerada

• Autor(a) principal: Santos, Paulo Miguel Trindade
• Data de Publicação: 2016
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/22346
• topic: Engenharia mecânica; Absorção de energia; Grafeno; Cortiça - Aglomerados - Propriedades mecânicas

The use of cork material has been quickly spreading over the last years due to more care taken to environmental issues. The scrap coming from the production of traditional wine stopper or from the production of other cork products is generally triturated and agglomerated. The so-called agglomerated cork material has been finding a wide range of applications, being a good thermal and acoustic insulator, vibration and impact absorber. Nevertheless, scientific literature has been addressing agglomerated cork in a very general way and defining density and grain size as the two main defining parameters. Many studies that used agglomerated cork, failed to specify the parameters that were used in its production. This dissertation aims to show that, apart from density and grain size, there are other parameters, such as binder type or its quantity, may also have a very significant effect on the mechanical properties of cork in agglomerated form. To this end, the whole production process is detailed and a campaign of static and dynamic tests is carried out. Another goal of this dissertation was to determine the influence of the incorporation of nanomaterials, namely graphene and graphene oxide, as reinforcement on the agglomerated cork. With that goal, a second experimental campaign was planned and carried out. Consisting of quasi-static compression tests and burn tests. With the results obtain it was possible to conclude, that by altering the production parameters of the agglomerated cork it is possible to change its properties, to meet the requirements of the intended application.