Avaliação do comportamento dinâmico mecânico de compósitos nanoestruturados de PEI/MWCNT/fibras de carbono

• Autor(a) principal: Amaral, Tamires Repullio do [UNESP]
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/203639; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2019-06-25/000916339.pdf
• topic: Compósitos poliméricos; Nanotecnologia; Fibras de carbono; Materiais compostos; Polymeric composites

Nanotechnology is a recent area of knowledge that has enabled technological advances in materials development with better features for that they doesn't have only mechanical weight support function but also the integration of functions allied with mechanical resistance such as thermal and electrical functions, resulting in multifunctional materials. In this context the nanostructured polymer composites present greater advantages compared to tradicional composites, since the high surface area increases the interaction between reinforcement and matrix promoting the improvement of the mechanical, thermal and electrical properties. In this work, thin films with and without: 1%, 0,75%, 0,50% and 0,25% MWCNT (multi walled carbon nanotubes) addiction were preparated by mixing technique in solution. Then, the processing PEI and PEI/MWCNT composites reinforced with carbon fiber was performed from the hot compression molding technique. Thermally the processed composites were evaluated by the techniques of Thermogravimetry (TGA) and Differential Exploration Calorimetry (DSC). Afterwards, the impulse excitation test and Dynamic-Mechanical Analysis (DMA) were performed in order to evaluate the influence of the addition of carbon nanotubes. Based on thermal analysis of thermogravimetry (TGA) performed, there was an improvement in the thermal stability of the material. From the analysis of the micrographs obtained from the SEM it was possible to evaluate that the dispersion of the nanorefractions with addiction of 0,25% and 1% in the polymeric matrix showed better results. Finally, based on the dynamic-mechanic analysis (DMA) performed on the PEI/MWCNT composites, an improvement in the viscoelastic properties of the materials was observed, mainly in the composite with addiction of 0,25% and 0,50% of MWCNT that contributed for better adhesion factors (A), B, C and the entanglement (N)