Obtenção e caracterização de compósitos de benzoxazina/fibra de carbono

• Ano de defesa: 2015
• Autor(a) principal: Bandeira, Cirlene Fourquet [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Materiais compostos; Compositos polimericos; Cisalhamento; Fibras de carbono; Compostos fibrosos; Resinas compostas; Analise termica; Composite materials
• Link de acesso: http://hdl.handle.net/11449/127961; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/10-09-2015/000846869.pdf

A series of new resins have been developed meeting the needs of an increasingly demanding market, among these the polibenzoxazin resins which constitute a new class of thermoset phenolic resin, which is overcoming the properties of traditional epoxy and phenolic resins when applied in the aerospace industry. With this, the present work aims to synthesize high performance benzoxazine resin called oAI-a (ortho-amide-imide benzoxazin), process composite benzoxazin/carbon fiber via'Hand lay up'using the benzoxazin phenol resins diamino diphenyl methane (P-DDM), the resin oAI-a and the benzoxazine resin commercially available (Epsilon 99100 RTM) via compression hot molding and characterize their physical and chemical properties both under dry conditions and exposed to ultraviolet radiation, humidity and heat and jet fuel, helping it to control production and characterization of new materials with aerospace applications. The results obtained from this study were compared between themselves and with the mechanical and thermal properties of traditional epoxy and phenolic resins available in the literature. The results show that benzoxazine resin composites Epsilon 99100 RTM and P-DDM exhibit good consolidation glass transition temperature around 162°C to the resin Epsilon 99100 RTM and 168°C to the resin P-DDM and good thermal stability. In the case of the composites obtained with Epsilon 99100 RTM resin the conditioning by immersion in water its Tg was reduced 12%, and up to 4.5% for samples UV conditioned when compared to nonconditioned samples. It was also observed that for the samples exposed to aviation kerosene was an increase in the Tg value of up to 3.5% compared with the results obtained in nonconditioned samples. In addition, samples conditioned in water showed an increase of interlaminar shear strength(22%) compared to non-conditioned samples; while the samples immersed in jet fuel showed no significant variation in their performance