| Abstract Scope |
Lignocellulosic fibers have increasingly been used in various industrial sectors due to their low cost, notable mechanical properties, and biodegradability. In this study, polyester matrix composites were developed reinforced with 10, 20, and 30 wt% of stem fibers from Euterpe oleracea (açaí palm). The composites were characterized through Charpy impact and tensile tests, Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The incorporation of fibers enhanced impact strength, tensile strength, strain, elastic modulus, and toughness by up to 2301%, 423%, 111%, 432%, and 1004%, respectively. However, thermal deformation resistance decreased by approximately 35 °C compared to neat polyester. SEM analysis revealed poor fiber–matrix adhesion, yet the fibers played a key role in crack propagation prevention. Overall, the results demonstrate that açaí palm fibers significantly improve the mechanical performance of polyester composites, despite reducing their thermal resistance. |