Caracterização e aplicação das fibras de Cyperus papyrus em compósito polimérico

• Ano de defesa: 2024
• Autor(a) principal: Nascimento, Mateus Urbano do
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Engenharia Química; Centro de Ciências Agrárias e Engenharias; UFES; Programa de Pós-Graduação em Engenharia Química
• Palavras-chave em Português: Resina epóxi; Cyperus papyrus; Óleo de soja epoxidado; Papiro; Epoxy resin; Epoxidized soybean oil; Papyrus; Engenharia Química
• Link de acesso: http://repositorio.ufes.br/handle/10/18217

The growing environmental concern and the need for eco-efficient alternatives to structural materials have increased the demand for sustainable and innovative materials. In this regard, research and exploration of plant fibers for use in composites as a substitute for conventional forms have shown promise. In this context, this work aims to characterize and apply papyrus fibers (Cyperus papyrus) as a reinforcement element in a composite of epoxy resin with epoxidized soybean oil. The papyrus fibers were manually extracted from the plant and characterized in terms of their physical, chemical, thermal, morphological, and mechanical properties. Composites were produced from the fibers using an epoxy matrix incorporated with 20% epoxidized soybean oil, and three proportions of aligned fiber mass in the composites (10%, 20%, and 30%) were evaluated through chemical, thermal, and mechanical analyses. The fibers had an average diameter of 167.42 µm and a maximum tensile strength of 188.21 MPa. The crystallinity index of the fibers was 58.56%, and their thermal stability was 220°C. The best properties were achieved in the composites reinforced with 30% fiber, reflecting a mechanical improvement, with increases in tensile strength and modulus of elasticity of 133% and 630%, respectively, and thermal stability up to 262°C. However, the composites exhibited reduced deformation and toughness with the addition of fibers, indicating a more brittle nature. Thus, papyrus fibers demonstrated potential for use in composites and were effective in reinforcing the epoxy/epoxidized soybean oil matrix