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Mr. Lucas Neuba
(IME ) - Military Institute of Engineering

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Research Keywords & Expertise

0 Ballistic Limit Velocity
0 FTIR spectroscopy
0 Natural Fiber Reinforced Composite
0 Characterization and Mechanical Properties of Composites
0 ballistic protection

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Short Biography

Military Institute Engeneering Praça Gen. Tibúrcio, 80 - Urca, Rio de Janeiro - RJ, 22290-270.

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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: 14 September 2020 in Polymers
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A basic characterization of novel epoxy matrix composites incorporated with up to 40 vol% of processed leaf fibers from the Copernicia prunifera palm tree, known as carnauba fibers, was performed. The tensile properties for the composite reinforced with 40 vol% of carnauba fibers showed an increase (40%) in the tensile strength and (69%) for the elastic modulus. All composites presented superior elongation values in comparison to neat epoxy. Izod impact tests complemented by fibers/matrix interfacial strength evaluation by pullout test and Fourier transformed infrared (FTIR) analysis revealed for the first time a significant reinforcement effect (> 9 times) caused by the carnauba fiber to polymer matrix. Additional thermogravimetric analysis (TG/DTG) showed the onset of thermal degradation for the composites (326 ~ 306 °C), which represents a better thermal stability than the plain carnauba fiber (267 °C) but slightly lower than that of the neat epoxy (342 °C). Differential scanning calorimetry (DSC) disclosed an endothermic peak at 63 °C for the neat epoxy associated with the glass transition temperature (Tg). DSC endothermic peaks for the composites, between 73 to 103 °C, and for the plain carnauba fibers, 107 °C, are attributed to moisture release. Dynamic mechanical analysis confirms Tg of 64 °C for the neat epoxy and slightly higher composite values (82–84 °C) due to the carnauba fiber interference with the epoxy macromolecular chain mobility. Both by its higher impact resistance and thermal behavior, the novel carnauba fibers epoxy composites might be considered a viable substitute for commonly used glass fiber composites.

ACS Style

Raí Felipe Pereira Junio; Lucio Fabio Cassiano Nascimento; Lucas De Mendonça Neuba; Andressa Teixeira Souza; João Victor Barbosa Moura; Fábio Da Costa Garcia Filho; Sergio Neves Monteiro. Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites. Polymers 2020, 12, 2090 .

AMA Style

Raí Felipe Pereira Junio, Lucio Fabio Cassiano Nascimento, Lucas De Mendonça Neuba, Andressa Teixeira Souza, João Victor Barbosa Moura, Fábio Da Costa Garcia Filho, Sergio Neves Monteiro. Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites. Polymers. 2020; 12 (9):2090.

Chicago/Turabian Style

Raí Felipe Pereira Junio; Lucio Fabio Cassiano Nascimento; Lucas De Mendonça Neuba; Andressa Teixeira Souza; João Victor Barbosa Moura; Fábio Da Costa Garcia Filho; Sergio Neves Monteiro. 2020. "Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites." Polymers 12, no. 9: 2090.

Journal article
Published: 08 September 2020 in Polymers
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A growing environmental concern is increasing the search for new sustainable materials. In this scenario, natural lignocellulosic fibers (NLFs) became an important alternative to replace synthetic fibers commonly used as composites reinforcement. In this regard, unknown NLFs such as the caranan fiber (Mauritiella armata) found in South American rain forests revealed promising properties for engineering applications. Thus, for the first time, the present work conducted a technical characterization of caranan fiber-incorporated composites. Epoxy matrix composites with 10, 20 and 30 vol% of continuous and aligned caranan fibers were investigated by tensile tests, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Composites with more than 10% vol of caranan fibers significantly increase the elastic modulus and toughness in comparison to the neat epoxy. Indeed, the composite with 30 vol% was 50% stiffer, 130% tougher, and 100% stronger, which characterized an effective reinforcement. As for the elastic modulus, total strain and tensile toughness, there is a clear tendency of improvement with the amount of caranan fiber. The TGA disclosed the highest onset temperature of degradation (298 °C) with the least mass loss (36.8%) for the 30 vol% caranan fiber composite. It also displayed a higher degradation peak at 334 °C among the studied composites. The lowest glass transition temperature of 63 °C was obtained by DSC, while the highest of 113 °C by dynamic mechanical analysis (DMA) for the 30 vol% caranan composite. These basic technical findings emphasize the caranan fiber potential as reinforcement for polymer composites.

ACS Style

Andressa Teixeira Souza; Raí Felipe Pereira Junio; Lucas De Mendonça Neuba; Verônica Scarpini Candido; Alisson Clay Rios Da Silva; Afonso Rangel Garcez De Azevedo; Sergio Neves Monteiro; Lucio Fabio Cassiano Nascimento. Caranan Fiber from Mauritiella armata Palm Tree as Novel Reinforcement for Epoxy Composites. Polymers 2020, 12, 2037 .

AMA Style

Andressa Teixeira Souza, Raí Felipe Pereira Junio, Lucas De Mendonça Neuba, Verônica Scarpini Candido, Alisson Clay Rios Da Silva, Afonso Rangel Garcez De Azevedo, Sergio Neves Monteiro, Lucio Fabio Cassiano Nascimento. Caranan Fiber from Mauritiella armata Palm Tree as Novel Reinforcement for Epoxy Composites. Polymers. 2020; 12 (9):2037.

Chicago/Turabian Style

Andressa Teixeira Souza; Raí Felipe Pereira Junio; Lucas De Mendonça Neuba; Verônica Scarpini Candido; Alisson Clay Rios Da Silva; Afonso Rangel Garcez De Azevedo; Sergio Neves Monteiro; Lucio Fabio Cassiano Nascimento. 2020. "Caranan Fiber from Mauritiella armata Palm Tree as Novel Reinforcement for Epoxy Composites." Polymers 12, no. 9: 2037.

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.