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<p>This study evaluates the potential of <i>Dracaena trifasciata</i> (DT) fibers as reinforcement in epoxy composites by analyzing mechanical, thermal, and microstructural properties. Fibers underwent water-retting and drying, and were characterized via SEM and FTIR. Composites were fabricated by vacuum infusion with 55% fiber volume fraction and tested according to ASTM D638. Two epoxy systems were investigated: a rigid matrix (LY5052) and a flexible matrix (AR324). With LY5052, DT fiber incorporation led to a 101% increase in elastic modulus but caused a 26% reduction in tensile strength, attributed to stress concentration at the fiber–matrix interface and brittle matrix behavior. In contrast, composites with AR324 exhibited a 908% increase in stiffness and nearly 1000% improvement in tensile strength, enabled by superior strain compatibility between the flexible matrix and the fiber reinforcement. TGA analysis showed thermal stability above 400&#xa0;°C and ~ 5% increase in residual mass due to inorganic components in DT fibers. SEM revealed predominant fiber pull-out, 40&#xa0;µm voids, and resin penetration into the fiber lumen. These findings highlight the importance of matrix selection in maximizing the mechanical potential of natural fibers. DT/epoxy composites are promising for lightweight applications, particularly when paired with ductile matrices that mitigate premature failure mechanisms.</p>

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RETRACTED ARTICLE: Interface Performance of Untreated Dracaena trifasciata Fibers in Epoxy Composites

  • 期刊论文

  • 发表日期：

    2025年6月21日

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  • Larissa Queiroz Minillo,
  • Mariana Natale Fiorelli Fabiche,
  • Vanessa Carolina Lombardi Ambrosio,
  • Bruno César de Castro Cardoso,
  • Altibano Ortenzi

摘要

This study evaluates the potential of Dracaena trifasciata (DT) fibers as reinforcement in epoxy composites by analyzing mechanical, thermal, and microstructural properties. Fibers underwent water-retting and drying, and were characterized via SEM and FTIR. Composites were fabricated by vacuum infusion with 55% fiber volume fraction and tested according to ASTM D638. Two epoxy systems were investigated: a rigid matrix (LY5052) and a flexible matrix (AR324). With LY5052, DT fiber incorporation led to a 101% increase in elastic modulus but caused a 26% reduction in tensile strength, attributed to stress concentration at the fiber–matrix interface and brittle matrix behavior. In contrast, composites with AR324 exhibited a 908% increase in stiffness and nearly 1000% improvement in tensile strength, enabled by superior strain compatibility between the flexible matrix and the fiber reinforcement. TGA analysis showed thermal stability above 400 °C and ~ 5% increase in residual mass due to inorganic components in DT fibers. SEM revealed predominant fiber pull-out, 40 µm voids, and resin penetration into the fiber lumen. These findings highlight the importance of matrix selection in maximizing the mechanical potential of natural fibers. DT/epoxy composites are promising for lightweight applications, particularly when paired with ductile matrices that mitigate premature failure mechanisms.