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Mr. Matheus Ribeiro
Military Institute of Engineering

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Short communication
Published: 26 February 2021 in Journal of Materials Research and Technology
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Among the natural fibers, the hemp fiber extracted from the stem of Cannabis sativa is, after sisal, the second most applied as reinforcement of polymer composites and increasingly used from automotive to civil construction industries. Polypropylene (PP) is the most common hemp fiber-reinforced matrix. Despite numerous papers on the application of natural fibers reinforcing polymer composites for ballistic protection, only one was so far dedicated to hemp fibers/PP with this purpose. In the present work, the main objective is for the first time to investigate the ballistic performance of the epoxy matrix reinforced with up to 30 vol% of hemp fabric. Epoxy is recently emerging as another strong alternative for the hemp fiber/fabric matrix. Due to the great variability in properties, a preliminary investigation was conducted on the basic mechanical and thermal behavior of the composites. The 30 vol% reinforcement with hemp fabric increased by 7.5 times the Izod impact energy as well as by more than 60% the tensile strength and 80% of the elastic modulus as compared to the neat epoxy. For all composites, a decrease of 20% in thermal temperatures (Tonset and Tmax) occurred in comparison to neat epoxy. The absorbed ballistic energy from the impact of 0.22 ammunition was significantly higher (95–108.5 J) than that previously reported of 36 J for hemp fabric/PP composite and others natural fiber/epoxy composites.

ACS Style

Matheus Pereira Ribeiro; Lucas De Mendonça Neuba; Pedro Henrique Poubel Mendonça da Silveira; Fernanda Santos da Luz; André Ben-Hur Da Silva Figueiredo; Sergio Neves Monteiro; Mariane Oliveira Moreira. Mechanical, thermal and ballistic performance of epoxy composites reinforced with Cannabis sativa hemp fabric. Journal of Materials Research and Technology 2021, 12, 221 -233.

AMA Style

Matheus Pereira Ribeiro, Lucas De Mendonça Neuba, Pedro Henrique Poubel Mendonça da Silveira, Fernanda Santos da Luz, André Ben-Hur Da Silva Figueiredo, Sergio Neves Monteiro, Mariane Oliveira Moreira. Mechanical, thermal and ballistic performance of epoxy composites reinforced with Cannabis sativa hemp fabric. Journal of Materials Research and Technology. 2021; 12 ():221-233.

Chicago/Turabian Style

Matheus Pereira Ribeiro; Lucas De Mendonça Neuba; Pedro Henrique Poubel Mendonça da Silveira; Fernanda Santos da Luz; André Ben-Hur Da Silva Figueiredo; Sergio Neves Monteiro; Mariane Oliveira Moreira. 2021. "Mechanical, thermal and ballistic performance of epoxy composites reinforced with Cannabis sativa hemp fabric." Journal of Materials Research and Technology 12, no. : 221-233.

Journal article
Published: 08 August 2020 in Polymers
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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.

ACS Style

Lucas De Mendonça Neuba; Raí Felipe Pereira Junio; Matheus Pereira Ribeiro; Andressa Teixeira Souza; Eduardo De Sousa Lima; Fábio Da Costa Garcia Filho; André Ben-Hur Da Silva Figueiredo; Fábio De Oliveira Braga; Afonso Rangel Garcez De Azevedo; Sergio Neves Monteiro. Promising Mechanical, Thermal, and Ballistic Properties of Novel Epoxy Composites Reinforced with Cyperus malaccensis Sedge Fiber. Polymers 2020, 12, 1776 .

AMA Style

Lucas De Mendonça Neuba, Raí Felipe Pereira Junio, Matheus Pereira Ribeiro, Andressa Teixeira Souza, Eduardo De Sousa Lima, Fábio Da Costa Garcia Filho, André Ben-Hur Da Silva Figueiredo, Fábio De Oliveira Braga, Afonso Rangel Garcez De Azevedo, Sergio Neves Monteiro. Promising Mechanical, Thermal, and Ballistic Properties of Novel Epoxy Composites Reinforced with Cyperus malaccensis Sedge Fiber. Polymers. 2020; 12 (8):1776.

Chicago/Turabian Style

Lucas De Mendonça Neuba; Raí Felipe Pereira Junio; Matheus Pereira Ribeiro; Andressa Teixeira Souza; Eduardo De Sousa Lima; Fábio Da Costa Garcia Filho; André Ben-Hur Da Silva Figueiredo; Fábio De Oliveira Braga; Afonso Rangel Garcez De Azevedo; Sergio Neves Monteiro. 2020. "Promising Mechanical, Thermal, and Ballistic Properties of Novel Epoxy Composites Reinforced with Cyperus malaccensis Sedge Fiber." Polymers 12, no. 8: 1776.