2026-01-162026-01-162025-12-10COSTA, Leonardo José Biasi. Obtenção de celulose a partir de fibras do fruto do Açaí (Euterpe Oleracea Mart). Orientador: Edinaldo José de Sousa Cunha. 2026. 61 f. Trabalho de Curso (Bacharelado em Engenharia de Materiais) – Faculdade de Engenharia de Materiais, Campus Universitário de Ananindeua, Universidade Federal do Pará, Ananindeua, 2025. Disponível em: https://bdm.ufpa.br/handle/prefix/9087. Acesso em:.https://bdm.ufpa.br/handle/prefix/9087Composites based on biopolymers reinforced with natural fibers are known as biocomposites. These materials have been widely studied due to their biodegradability and lower production costs compared to conventional materials commonly used in industry. Açaí stands out in this context because a large amount of residue is generated during juice extraction. In this sense, this study aims to characterize açaí fibers obtained from discarded residues and subjected to different chemical treatments in order to evaluate their potential applications. Initially, the fibers were ground in a micromill located at the Labfilme Laboratory and subsequently sieved through 200-mesh sieves. The separated samples were then subjected to alkaline treatments using sodium hydroxide (NaOH), bleaching treatments using hydrogen peroxide (H₂O₂) and sodium hypochlorite (NaClO), and acid treatments using sulfuric acid (H₂SO₄) at different concentrations. At the end of the process, nine samples were obtained and labeled FA1 to FA9, where FA1 corresponds to untreated fibers; FA2 underwent only alkaline treatment; FA3, FA4 and FA5 underwent alkaline treatment followed by bleaching with different concentrations of hydrogen peroxide; FA6, FA7 and FA8 underwent alkaline treatment with different concentrations of sodium hydroxide followed by bleaching with sodium hypochlorite; and FA9 underwent alkaline treatment, bleaching with sodium hypochlorite and acid treatment. After the treatments, the samples were characterized by Energy Dispersive X-ray Spectroscopy (EDS), Scanning Electron Microscopy (SEM), and X-ray Diffraction (XRD). EDS analysis of FA1 revealed the fiber composition, showing a significant presence of calcium (Ca), carbon (C), oxygen (O), and silicon (Si). XRD results confirmed an increase in crystallinity after the chemical treatments. SEM analysis indicated improved removal of the superficial layer in samples FA6, FA7, and FA8, while sample FA9 showed greater degradation of the amorphous regions of the fiber, allowing the visualization of fine and elongated fibrils.Acesso AbertoFibras do AçaíFibras lignocelulósicasFibras de celuloseBiocompósitosAçaí fibersLignocellulosic fibersCellulose fibersBiocompositesCNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA::METALURGIA DE TRANSFORMACAO::TRATAMENTO TERMICOS, MECANICOS E QUIMICOSTrabalho de Curso - Graduação - MonografiaAttribution-NonCommercial-NoDerivs 3.0 Brazil