Nanomembranas interlaminares para compósitos de alto desempenho

• Ano de defesa: 2010
• Autor(a) principal: José de Ávila Júnior
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Compósitos; Electrospinning; Nanomembranas; Nanofibras; Grafeno; Engenharia mecânica
• Link de acesso: http://hdl.handle.net/1843/BUBD-8C4LT8

This investigation deals with the synthesis of polymeric nanomembranes and their application to laminated composites. The nanomembranes were generated using the electrospinningtechnique. PVA was employed during the preliminary studies, while PA-66 was used for the parametric study (polymer concentration, applied tension, solution flow rate, gap between needle and target) and nanofibers incorporation to the carbon fiber/epoxy composite. An additional investigated parameter was the graphene effect into nanofiber diameter. Obtained data showed that, for the PA-66, the average diameter is directly proportional to polymeric concentration, flow rate, and applied tension. The addition of graphene led to an increase of averagediameter. The average diameters for graphene concentrations of 0 wt%, 1 wt% and 2 wt% ranged from 57 nm (0 wt%) to 141 nm (2 wt%). Moreover, the average diameters were 37% smaller than the one reported into literature. The nanofibers/nanomembranes were incorporatedto carbon fiber/epoxy laminates by hand lay-up. Three point bending tests demonstrated a decrease on flexural strength due to the nanomembrane addition. One possible explanation for such behavior is the filter effect, which can lead to interlaminates void formation.