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Promising Mechanical, Thermal, and Ballistic Properties of Novel Epoxy Composites Reinforced with Cyperus malaccensis Sedge Fiber.
de Mendonça Neuba, Lucas; Pereira Junio, Raí Felipe; Ribeiro, Matheus Pereira; Souza, Andressa Teixeira; de Sousa Lima, Eduardo; Garcia Filho, Fábio da Costa; Figueiredo, André Ben-Hur da Silva; Braga, Fábio de Oliveira; Azevedo, Afonso Rangel Garcez de; Monteiro, Sergio Neves.
Afiliación
  • de Mendonça Neuba L; Department of Materials Science, Military Institute of Engineering-IME, Rio de Janeiro 22290270, Brazil.
  • Pereira Junio RF; Department of Materials Science, Military Institute of Engineering-IME, Rio de Janeiro 22290270, Brazil.
  • Ribeiro MP; Department of Materials Science, Military Institute of Engineering-IME, Rio de Janeiro 22290270, Brazil.
  • Souza AT; Department of Materials Science, Military Institute of Engineering-IME, Rio de Janeiro 22290270, Brazil.
  • de Sousa Lima E; Department of Materials Science, Military Institute of Engineering-IME, Rio de Janeiro 22290270, Brazil.
  • Garcia Filho FDC; Department of Mechanical and Aerospace Engineering, University of California San Diego-UCSD, La Jolla, CA 92093, USA.
  • Figueiredo ABDS; Department of Materials Science, Military Institute of Engineering-IME, Rio de Janeiro 22290270, Brazil.
  • Braga FO; Department of Civil Engineering, Federal Fluminense University-UFF, Niterói 24210240, Brazil.
  • Azevedo ARG; Department of Agricultural and Environmental Engineering, Federal Fluminense University-UFF, Niterói 24210240, Brazil.
  • Monteiro SN; Department of Materials Science, Military Institute of Engineering-IME, Rio de Janeiro 22290270, Brazil.
Polymers (Basel) ; 12(8)2020 Aug 08.
Article en En | MEDLINE | ID: mdl-32784467
Composites reinforced with natural lignocellulosic fibers (NLFs) are gaining relevance as the worldwide demand for renewable and sustainable materials increases. To develop novel natural composites with satisfactory properties, less common NLFs should also be investigated. Among these, the Cyperus malaccensis (CM), a type of sedge fiber, is already used in simple items like ropes, furniture, and paper, but has not yet been investigated as composite reinforcement for possible engineering applications. Therefore, the present work evaluated for the first time the properties of novel epoxy composites incorporated with 10, 20, and 30 vol.% of CM sedge fibers. Tensile, Izod-impact, and ballistic impact tests were performed, as well as Fourier transform infrared (FT-IR) spectroscopy and thermal analysis of the composites. Results disclosed a decrease (-55%) in tensile strengths as compared to the neat epoxy. However, the elastic modulus of the 30 vol.% sedge fiber composite increased (+127%). The total strain and absorbed ballistic energy did not show significant variation. The Izod impact energy of the 30 vol.% composite was found to be 181% higher than the values obtained for the neat epoxy as a control sample. An increase in both stiffness and toughness characterized a reinforcement effect of the sedge fiber. The thermal analysis revealed a slight decrease (-15%) in the degradation temperature of the CM sedge fiber composites compared to the neat epoxy. The glass-transition temperatures were determined to be in the range of 67 to 81 °C.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Polymers (Basel) Año: 2020 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Suiza
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Polymers (Basel) Año: 2020 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Suiza