Avaliação da influência da adição de nanotubos de carbono nas propriedades térmica e mecânicas de compósitos de polipropileno/nanotubos de carbono.

• Autor(a) principal: Costa, Lívia Maria Rédua Nunes da
• Data de Publicação: 2021
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/214751
• topic: Polypropylene composites; Carbon nanotubes; Mechanical properties; Thermal properties; Compósitos de polipropileno; Nanotubos de carbono; Propriedades mecânicas; Propriedades térmicas; Materiais compostos; Nanocompósitos (Materiais); Materiais nanoestruturados

Carbon nanotubes have attracted attention since they were discovered. They turned out to be a revolution in several areas, mainly in the composites field as filler. This is essentially due to its low weight and its excellent thermal and mechanical properties. Polypropylene (PP), also called attention as a matrix, since being a highly used and it has an excellent ratio of physical and mechanical properties with an easy process with low price. Thus, this study focuses on the evaluation of PP/CNT composites with 0.5, 1.0, 1.5 and 2.0 by mass process by a modified thin screw extruder. According to the results, the quantity of CNT follows a proportional relation with the mechanical and thermal properties until a limit concentration at which the CNT begins to agglomerate and act as a generator of defects in the network. Halpin-Tsai, Voigt-Reuss and Cox equations were adapted to fit the experimental data of the PP/CNT composites tensile strength. The optimum filler content is 1.0% by mass, which reaches a saturation value around 40 MPa and 47 MPa in the tensile and flexure modulus respectively. Further, the tribological tests demonstrate the specific wear rate decreases with the increases of the CNT.