Análise de degradação do compósito de resina epóxi e fibra de vidro via envelhecimento natural
This work analyzes the influence of climatic conditions on the degradation of composites manufactured from epoxy and fiberglass prepregs, focusing on the climatic context of Northeast Brazil. Moisture and ultraviolet (UV) radiation are known degrading agents for polymer matrix composites. Prolong...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/56619 |
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| Resumo: | This work analyzes the influence of climatic conditions on the degradation of
composites manufactured from epoxy and fiberglass prepregs, focusing on the climatic
context of Northeast Brazil. Moisture and ultraviolet (UV) radiation are known
degrading agents for polymer matrix composites. Prolonged exposure to both agents
enhances the degradation of polymeric composite materials through mechanisms
involving the formation of cracks, a reduction in adhesion between matrix and
reinforcement, and the modification of thermal, and mechanical properties, as well as
chemical alterations of the material. In order to assess the degree of degradation of
the materials in question under direct and natural exposure to sunlight, atmosphere,
and rain, this study applied an aging process over 744 hours. Three unaged samples
and three aged samples were investigated to compare physical, chemical, and
morphological changes through dynamic mechanical analysis (DMA), Fourier-
transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The
results of the analyses on the aged samples revealed visual changes, such as
yellowing, indicating degradation. SEM images showed microcracks in the matrix and
detachment at the interface, caused by exposure to moisture and UV radiation. FTIR
spectroscopy suggests chemical signatures of degradation, with indication of
functional groups such as amide. DMA results suggest a slight increase in the glass
transition temperature (Tg) and the tan δ peak of the aged samples, possibly due to
increased epoxy resin crosslinking |
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