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Prof. André Ben-Hur da Figueiredo
Instituto Militar de Engenharia

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0 Composite Applications
0 Nanoparticle synthesis
0 ferrites
0 ballistic protection
0 armor material

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Journal article
Published: 15 August 2021 in Polymers
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Polymer composites reinforced with natural fabric have recently been investigated as possible ballistic armor for personal protection against different levels of ammunition. In particular, fabric made of fique fibers, which is extracted from the leaves of the Furcraea andina, was applied as reinforcement for polymer composites used in a multilayered armor system (MAS). The superior performance of the fique fabric composites as a second MAS layer motivated this brief report on the determination of the absorbed energy and capability to limit velocity in the stand-alone ballistic tests. The single plates of epoxy composites, which were reinforced with up to 50 vol% of fique fabric, were ballistic tested as targets against 7.62 mm high-speed, ~840 m/s, impact ammunition for the first time. The results were statistically analyzed by the Weibull method and ANOVA. The absorbed energies of the 200–219 J and limit velocities of 202–211 m/s were found statistically similar to the epoxy composites reinforced with the fique fabric from 15 to 50 vol%. Predominantly, these findings are better than those reported for the plain epoxy and aramid fabric (KevlarTM) used as stand-alone plates with the same thickness. Macrocracks in the 15 and 30 vol% fique fabric composites compromise their application as armor plates. The delamination rupture mechanism was revealed by scanning electron microscopy. By contrast, the integrity was maintained in the 40 and 50 vol% composites, ensuring superior ballistic protection compared to the use of KevlarTM.

ACS Style

Michelle Souza Oliveira; Fernanda Santos da Luz; Henry Alonso Colorado Lopera; Lucio Fabio Cassiano Nascimento; Fabio Da Costa Garcia Filho; Sergio Neves Monteiro. Energy Absorption and Limit Velocity of Epoxy Composites Incorporated with Fique Fabric as Ballistic Armor—A Brief Report. Polymers 2021, 13, 2727 .

AMA Style

Michelle Souza Oliveira, Fernanda Santos da Luz, Henry Alonso Colorado Lopera, Lucio Fabio Cassiano Nascimento, Fabio Da Costa Garcia Filho, Sergio Neves Monteiro. Energy Absorption and Limit Velocity of Epoxy Composites Incorporated with Fique Fabric as Ballistic Armor—A Brief Report. Polymers. 2021; 13 (16):2727.

Chicago/Turabian Style

Michelle Souza Oliveira; Fernanda Santos da Luz; Henry Alonso Colorado Lopera; Lucio Fabio Cassiano Nascimento; Fabio Da Costa Garcia Filho; Sergio Neves Monteiro. 2021. "Energy Absorption and Limit Velocity of Epoxy Composites Incorporated with Fique Fabric as Ballistic Armor—A Brief Report." Polymers 13, no. 16: 2727.

Journal article
Published: 01 August 2021 in Journal of Composites Science
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Since the mid-2000s, several studies were carried out regarding the development of ballistic resistant materials based on polymeric matrix composites reinforced with natural lignocellulosic fibers (NLFs). The results reported so far are promising and are often comparable to commonly used materials such as KevlarTM, especially when used as an intermediate layer in a multilayer armor system (MAS). However, the most suitable configuration for these polymer composites reinforced with NLFs when subjected to high strain rates still lacks investigation. This work aimed to evaluate four possible arrangements for epoxy matrix composite reinforced with a stiff Brazilian NLF, piassava fiber, regarding energy absorption, and ballistic efficiency. Performance was evaluated against the ballistic impact of high-energy 7.62 mm ammunition. Obtained results were statistically validated by means of analysis of variance (ANOVA) and Tukey’s honest test. Furthermore, the micromechanics associated with the failure of these composites were determined. Energy absorption of the same magnitude as KevlarTM and indentation depth below the limit predicted by NIJ standard were obtained for all conditions.

ACS Style

Fabio Garcia Filho; Fernanda Luz; Michelle Oliveira; Wendell Bezerra; Josiane Barbosa; Sergio Monteiro. Influence of Rigid Brazilian Natural Fiber Arrangements in Polymer Composites: Energy Absorption and Ballistic Efficiency. Journal of Composites Science 2021, 5, 201 .

AMA Style

Fabio Garcia Filho, Fernanda Luz, Michelle Oliveira, Wendell Bezerra, Josiane Barbosa, Sergio Monteiro. Influence of Rigid Brazilian Natural Fiber Arrangements in Polymer Composites: Energy Absorption and Ballistic Efficiency. Journal of Composites Science. 2021; 5 (8):201.

Chicago/Turabian Style

Fabio Garcia Filho; Fernanda Luz; Michelle Oliveira; Wendell Bezerra; Josiane Barbosa; Sergio Monteiro. 2021. "Influence of Rigid Brazilian Natural Fiber Arrangements in Polymer Composites: Energy Absorption and Ballistic Efficiency." Journal of Composites Science 5, no. 8: 201.

Review
Published: 31 July 2021 in Materials
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This review article proposes the identification and basic concepts of materials that might be used for the production of high-performance concrete (HPC) and ultra-high-performance concrete (UHPC). Although other reviews have addressed this topic, the present work differs by presenting relevant aspects on possible materials applied in the production of HPC and UHPC. The main innovation of this review article is to identify the perspectives for new materials that can be considered in the production of novel special concretes. After consulting different bibliographic databases, some information related to ordinary Portland cement (OPC), mineral additions, aggregates, and chemical additives used for the production of HPC and UHPC were highlighted. Relevant information on the application of synthetic and natural fibers is also highlighted in association with a cement matrix of HPC and UHPC, forming composites with properties superior to conventional concrete used in civil construction. The article also presents some relevant characteristics for the application of HPC and UHPC produced with alkali-activated cement, an alternative binder to OPC produced through the reaction between two essential components: precursors and activators. Some information about the main types of precursors, subdivided into materials rich in aluminosilicates and rich in calcium, were also highlighted. Finally, suggestions for future work related to the application of HPC and UHPC are highlighted, guiding future research on this topic.

ACS Style

Markssuel Marvila; Afonso de Azevedo; Paulo de Matos; Sergio Monteiro; Carlos Vieira. Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials. Materials 2021, 14, 4304 .

AMA Style

Markssuel Marvila, Afonso de Azevedo, Paulo de Matos, Sergio Monteiro, Carlos Vieira. Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials. Materials. 2021; 14 (15):4304.

Chicago/Turabian Style

Markssuel Marvila; Afonso de Azevedo; Paulo de Matos; Sergio Monteiro; Carlos Vieira. 2021. "Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials." Materials 14, no. 15: 4304.

Review
Published: 28 July 2021 in Polymers
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Geopolymer materials have been gaining ground in the civil construction sector not only for having superior physical properties when compared to conventional cement, but also for being less harmful to the environment, since the synthesis of the geopolymer does not release toxic gases or require high energy costs. On the other hand, geopolymer materials like cementitious matrices have low flexural strength and have fragile breakage. To overcome these deficiencies, the insertion of fibers in geopolymeric matrices has been evaluated as a solution. Although most research on this practice focuses on the use of synthetic fibers, the use of natural fibers has been growing and brings as an advantage the possibility of producing an even more ecological material, satisfying the need to create eco-friendly materials that exists today in society. Thus, this paper aimed to, through the evaluation of research available in the literature, understand the behavior of fibers in geopolymer matrices, identify similarities and differences between the performance of geopolymer composites reinforced with natural and synthetic fibers and, understanding that it is possible, point out ways to optimize the performance of these composites.

ACS Style

Afonso de Azevedo; Ariana Cruz; Markssuel Marvila; Leandro de Oliveira; Sergio Monteiro; Carlos Vieira; Roman Fediuk; Roman Timokhin; Nikolai Vatin; Marina Daironas. Natural Fibers as an Alternative to Synthetic Fibers in Reinforcement of Geopolymer Matrices: A Comparative Review. Polymers 2021, 13, 2493 .

AMA Style

Afonso de Azevedo, Ariana Cruz, Markssuel Marvila, Leandro de Oliveira, Sergio Monteiro, Carlos Vieira, Roman Fediuk, Roman Timokhin, Nikolai Vatin, Marina Daironas. Natural Fibers as an Alternative to Synthetic Fibers in Reinforcement of Geopolymer Matrices: A Comparative Review. Polymers. 2021; 13 (15):2493.

Chicago/Turabian Style

Afonso de Azevedo; Ariana Cruz; Markssuel Marvila; Leandro de Oliveira; Sergio Monteiro; Carlos Vieira; Roman Fediuk; Roman Timokhin; Nikolai Vatin; Marina Daironas. 2021. "Natural Fibers as an Alternative to Synthetic Fibers in Reinforcement of Geopolymer Matrices: A Comparative Review." Polymers 13, no. 15: 2493.

Journal article
Published: 12 July 2021 in Journal of Materials Research and Technology
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Magnetically stabilized fluidized bed reactor (MSFBR) is a sustainable and cost-effective biotechnological process, which justifies the increasing search for biocatalytic superparamagnetic supports to enzyme immobilization. This work, investigates the effect of modified nanomagnetite, Fe3O4 (nM), for biocatalytic support on properties associated with catalytic behavior and potential use in MSFBR. The nM was either synthesized and then modified with 3-aminopropyltriethoxysilano (nM-APTES) or stabilized with oleic acid (nM-OA) and later modified with chitosan (nM-OA-Cs). A novel correlation study was carried out about the support dimension effect, enzymatic surface loading and retained activity. Both nM-based supports were morphologically, structurally and magnetically characterized by X-ray diffraction, thermogravimetry, Mössbauer and Fourier-transform Infrared spectroscopies, as well as vibration sample magnetometry, scanning (SEM) and transmission (TEM) electron microscopies. The nM-APTES and nM-OA samples disclosed crystal sizes of 8.07 and 8.69 nm, respectively. From TEM imagens, the average particles sizes were 10.9 nm for nM-APTES and 12.6 nm for nM-OA. The nM-OA-Cs displayed an average particles size of 918.6 μm. These magnetic supports displayed high saturated magnetization, 79.6 emu/g for nM-APTES and 72.7 emu/g for nM-OA. The amano lipase AK enzyme was immobilized on supports activated with glutaraldehyde. The enzyme loading density of nM-APTES-GA-Lip (122 mg/g) with 61% immobilization yield was higher than that of nM-OA-Cs-GA-Lip (46 mg/g) with 23% immobilization yield. The catalytic activity of nM-APTES-GA-Lip (85%) was higher than that of nM-OA-Cs-GA-Lip (46%), which reflected the correlation between enzyme loading efficiency on the magnetic nanosupports and their relative activity, essential to potential use in MSFBR.

ACS Style

Ellen F. Bôa Morte; Darlan S. Marum; Elisa B. Saitovitch; Mariella Alzamora; Sergio Neves Monteiro; Ruben J. Sanchez Rodriguez. Modified magnetite nanoparticle as biocatalytic support for magnetically stabilized fluidized bed reactors. Journal of Materials Research and Technology 2021, 14, 1112 -1125.

AMA Style

Ellen F. Bôa Morte, Darlan S. Marum, Elisa B. Saitovitch, Mariella Alzamora, Sergio Neves Monteiro, Ruben J. Sanchez Rodriguez. Modified magnetite nanoparticle as biocatalytic support for magnetically stabilized fluidized bed reactors. Journal of Materials Research and Technology. 2021; 14 ():1112-1125.

Chicago/Turabian Style

Ellen F. Bôa Morte; Darlan S. Marum; Elisa B. Saitovitch; Mariella Alzamora; Sergio Neves Monteiro; Ruben J. Sanchez Rodriguez. 2021. "Modified magnetite nanoparticle as biocatalytic support for magnetically stabilized fluidized bed reactors." Journal of Materials Research and Technology 14, no. : 1112-1125.

Communication
Published: 10 July 2021 in Polymers
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Fibers extracted from Amazonian plants that have traditionally been used by local communities to produce simple items such as ropes, nets, and rugs, are now recognized as promising composite reinforcements. This is the case for guaruman (Ischinosiphon körn) fiber, which was recently found to present potential mechanical and ballistic properties as 30 vol% reinforcement of epoxy composites. To complement these properties, Izod impact tests are now communicated in this brief report for similar composites with up to 30 vol% of guaruman fibers. A substantial increase in impact resistance, with over than 20 times the absorbed energy for the 30 vol% guaruman fiber composite, was obtained in comparison to neat epoxy. These results were statistically validated by Weibull analysis, ANOVA, and Tukey’s test. Scanning electron microscopy analysis disclosed the mechanisms responsible for the impact performance of the guaruman fiber composites.

ACS Style

Raphael Reis; Fabio Garcia Filho; Larissa Nunes; Veronica Candido; Alisson Silva; Sergio Monteiro. Impact Resistance of Epoxy Composites Reinforced with Amazon Guaruman Fiber: A Brief Report. Polymers 2021, 13, 2264 .

AMA Style

Raphael Reis, Fabio Garcia Filho, Larissa Nunes, Veronica Candido, Alisson Silva, Sergio Monteiro. Impact Resistance of Epoxy Composites Reinforced with Amazon Guaruman Fiber: A Brief Report. Polymers. 2021; 13 (14):2264.

Chicago/Turabian Style

Raphael Reis; Fabio Garcia Filho; Larissa Nunes; Veronica Candido; Alisson Silva; Sergio Monteiro. 2021. "Impact Resistance of Epoxy Composites Reinforced with Amazon Guaruman Fiber: A Brief Report." Polymers 13, no. 14: 2264.

Journal article
Published: 20 June 2021 in Polymers
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Kenaf (Hibiscus cannabinus L.) is one of the most investigated and industrially applied natural fibers for polymer composite reinforcement. However, relatively limited information is available regarding its epoxy composites. In this work, both thermal and chemical properties were, for the first time, determined in kenaf fiber reinforced epoxy matrix composites. Through XRD analysis, a microfibrillar angle of 7.1° and crystallinity index of 44.3% was obtained. The FTIR analysis showed the functional groups normally found for natural lignocellulosic fibers. TMA analysis of the composites with 10 vol% and 20 vol% of kenaf fibers disclosed a higher coefficient of thermal expansion. The TG/DTG results of the epoxy composites revealed enhanced thermal stability when compared to plain epoxy. The DSC results corroborated the results obtained by TGA, which indicated a higher mass loss in the first stage for kenaf when compared to its composites. These results might contribute to kenaf fiber composite applications requiring superior performance.

ACS Style

Thuane Silva; Pedro Silveira; Matheus Ribeiro; Maurício Lemos; Ana da Silva; Sergio Monteiro; Lucio Nascimento. Thermal and Chemical Characterization of Kenaf Fiber (Hibiscus cannabinus) Reinforced Epoxy Matrix Composites. Polymers 2021, 13, 2016 .

AMA Style

Thuane Silva, Pedro Silveira, Matheus Ribeiro, Maurício Lemos, Ana da Silva, Sergio Monteiro, Lucio Nascimento. Thermal and Chemical Characterization of Kenaf Fiber (Hibiscus cannabinus) Reinforced Epoxy Matrix Composites. Polymers. 2021; 13 (12):2016.

Chicago/Turabian Style

Thuane Silva; Pedro Silveira; Matheus Ribeiro; Maurício Lemos; Ana da Silva; Sergio Monteiro; Lucio Nascimento. 2021. "Thermal and Chemical Characterization of Kenaf Fiber (Hibiscus cannabinus) Reinforced Epoxy Matrix Composites." Polymers 13, no. 12: 2016.

Brief report
Published: 07 June 2021 in Polymers
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The coating of natural fiber by graphene oxide (GO) has, over, this past decade, attracted increasing attention as an effective way to improve the adhesion to polymer matrices and enhance the composite properties. In particular, the GO-functionalized 30 vol% curaua fiber (Ananas Erectifolius) reinforcing epoxy composite was found to display superior tensile and thermogravimetric properties as well as higher fiber/matrix interfacial shear strength. In this brief report, dynamic mechanical analysis (DMA) was conducted in up to 50 vol% GO-functionalized curaua fiber reinforced epoxy matrix (EM) composites. The objective was not only to extend the amount incorporated but also for the first time investigate the composite viscoelastic behavior. The GO functionalization of curaua fibers (GOCF) improved the DMA storage (E′) and loss (E″) modulus compared to the non-functionalized fiber composites. Values at 30 °C of both E′ (13.44 GPa) and E″ (0.67 GPa) for 50 vol% GO-functionalized curaua fiber reinforced epoxy matrix composites (50GOCF/EM) were substantially higher than those of 20 GOCF/EM with E′ (7.08 GPa) and E″ (0.22 GPa) as well as non-functionalized 50CF/EM with E′ (11.04 GPa) and E″ (0.45 GPa). All these results are above the neat epoxy previously reported values of E′ (3.86 GPa) and E″ (0.09 GPa). As for the tangent delta, the parameters associated with damping factor and glass transition temperature were not found to be significantly changed by GO functionalization, but decreased with respect to the neat epoxy due to chain mobility restriction.

ACS Style

Ulisses Costa; Lucio Nascimento; Wendell Almeida Bezerra; Vinícius De Oliveira Aguiar; Artur Pereira; Sergio Monteiro; Wagner Pinheiro. Dynamic Mechanical Behavior of Graphene Oxide Functionalized Curaua Fiber-Reinforced Epoxy Composites: A Brief Report. Polymers 2021, 13, 1897 .

AMA Style

Ulisses Costa, Lucio Nascimento, Wendell Almeida Bezerra, Vinícius De Oliveira Aguiar, Artur Pereira, Sergio Monteiro, Wagner Pinheiro. Dynamic Mechanical Behavior of Graphene Oxide Functionalized Curaua Fiber-Reinforced Epoxy Composites: A Brief Report. Polymers. 2021; 13 (11):1897.

Chicago/Turabian Style

Ulisses Costa; Lucio Nascimento; Wendell Almeida Bezerra; Vinícius De Oliveira Aguiar; Artur Pereira; Sergio Monteiro; Wagner Pinheiro. 2021. "Dynamic Mechanical Behavior of Graphene Oxide Functionalized Curaua Fiber-Reinforced Epoxy Composites: A Brief Report." Polymers 13, no. 11: 1897.

Journal article
Published: 05 June 2021 in Polymers
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In a recent paper, novel polyester nanocomposites reinforced with up to 3 wt% of cellulose nanocrystals (CNCs) extracted from conifer fiber were characterized for their crystallinity index, water absorption, and flexural and thermal resistance. The use of this novel class of nanocomposites as a possible substitute for conventional glass fiber composites (fiberglass) was then suggested, especially for the 1 and 2 wt% CNC composites due to promising bending, density, and water absorption results. However, for effective engineering applications requiring impact and tensile performance, the corresponding properties need to be evaluated. Therefore, this extension of the previous work presents additional results on Izod and tensile tests of 1 and 2 wt% CNC-reinforced polyester composites, together with a comparative cost analysis with fiberglass. The chemical effect caused by incorporation of CNCs into polyester was also investigated by FTIR. In comparison to the neat polyester, the Izod impact energy increased 50% and 16% for the 1 and 2 wt% composites, respectively. On the other hand, the tensile strength and Young’s modulus remained constant within the ANOVA statistical analysis. FTIR analysis failed to reveal any chemical modification caused by up to 2 wt% CNC incorporation. The present impact and tensile results corroborate the promising substitution of a polyester composite reinforced with very low amount of CNCs for common fiberglass in engineering application.

ACS Style

Grazielle Maradini; Michel Oliveira; Lilian Carreira; Damaris Guimarães; Demetrius Profeti; Ananias Dias Júnior; Walter Boschetti; Bárbara Oliveira; Artur Pereira; Sergio Monteiro. Impact and Tensile Properties of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystal: A Previous Study Extension. Polymers 2021, 13, 1878 .

AMA Style

Grazielle Maradini, Michel Oliveira, Lilian Carreira, Damaris Guimarães, Demetrius Profeti, Ananias Dias Júnior, Walter Boschetti, Bárbara Oliveira, Artur Pereira, Sergio Monteiro. Impact and Tensile Properties of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystal: A Previous Study Extension. Polymers. 2021; 13 (11):1878.

Chicago/Turabian Style

Grazielle Maradini; Michel Oliveira; Lilian Carreira; Damaris Guimarães; Demetrius Profeti; Ananias Dias Júnior; Walter Boschetti; Bárbara Oliveira; Artur Pereira; Sergio Monteiro. 2021. "Impact and Tensile Properties of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystal: A Previous Study Extension." Polymers 13, no. 11: 1878.

Journal article
Published: 31 May 2021 in Journal of Materials Research and Technology
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Polycaprolactone (PCL) bionanocomposites reinforced with microfibrillated cellulose (MFC), either plain or modified with 2 wt% of zinc oxide (ZnO) nanoparticles, were first time developed for possible application as multifunctional packing. The MFC was obtained by an alkali treatment, a steam explosion process, and ZnO modification applied to parchment (PAR), a husk waste from the coffee industry. X-ray diffraction (XDR), thermogravimetric analysis (TGA/DTG), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), tensile tests, and CO2 permeability characterized the MFCs and the bionanocomposites. As for the MCFs, the crystallinity index of 50.6% measured by XRD for the plain PAR fiber increases with the combined alkaline treatment and steam explosion (CFA/EXP) to 68.2%, and further with ZnO modification (ZnO-CFA/EXP) to 80.1%. TGA/DTG displays a rising onset of thermal degradation from 214 to 306 °C, as well as maximum degradation rate from 330 to 350 °C, for PAR and ZnO-CFA/EXP, respectively. Regarding the nanocomposites, the addition of 3 wt% of alkali/steam explosion and ZnO-modified CFA/EXP contributes to enhancing thermal stability. Tensile tests disclosed improved mechanical properties of the novel nanocomposites as compared to the PCL matrix. In particular, Young's modulus rose from 88.5 to 169.5 MPa for the plain PCL and PCL reinforced with 3(ZnO-CFA/EXP), respectively. SEM images evidenced the participation of cellulose micro and nanofibrils in the PCL matrix. Approximately 20% reduction in the CO2 permeability coefficient of both PCL and its 3CFA/EXP nanocomposite compared with 3(ZnO-CFA/EXP) proved that the ZnO nanoparticles provide a gas barrier to the nanocomposite, a convenient property for food packing.

ACS Style

Raquel Soares Reis; Diego De Holanda Saboya Souza; Maria De Fátima Vieira Marques; Fernanda Santos da Luz; Sergio Neves Monteiro. Novel bionanocomposite of polycaprolactone reinforced with steam-exploded microfibrillated cellulose modified with ZnO. Journal of Materials Research and Technology 2021, 13, 1324 -1335.

AMA Style

Raquel Soares Reis, Diego De Holanda Saboya Souza, Maria De Fátima Vieira Marques, Fernanda Santos da Luz, Sergio Neves Monteiro. Novel bionanocomposite of polycaprolactone reinforced with steam-exploded microfibrillated cellulose modified with ZnO. Journal of Materials Research and Technology. 2021; 13 ():1324-1335.

Chicago/Turabian Style

Raquel Soares Reis; Diego De Holanda Saboya Souza; Maria De Fátima Vieira Marques; Fernanda Santos da Luz; Sergio Neves Monteiro. 2021. "Novel bionanocomposite of polycaprolactone reinforced with steam-exploded microfibrillated cellulose modified with ZnO." Journal of Materials Research and Technology 13, no. : 1324-1335.

Journal article
Published: 20 April 2021 in Materials
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The fresh and rheological properties of alkali mortars activated by blast furnace slag (BFS) were investigated. Consistency tests, squeeze flow, dropping ball, mass density in the hardened state, incorporated air, and water retention were performed. Mortars were produced with the ratio 1:2:0.45 (binder:sand:water), using not only ordinary Portland cement for control but also BFS, varying the sodium content of the activated alkali mortars from 2.5 to 15%. The results obtained permitted understanding that mortars containing 2.5 to 7.5% sodium present a rheological behavior similar to cementitious mortars by the Bingham model. In turn, the activated alkali mortars containing 10 to 15% sodium showed a very significant change in the properties of dynamic viscosity, which is associated with a change in the type of model, starting to behave similar to the Herschel–Bulkley model. Evaluating the properties of incorporated air and water retention, it appears that mortars containing 12.5% and 15% sodium do not have compatible properties, which is related to the occupation of sodium ions in the interstices of the material. Thus, it is concluded that the techniques used were consistent in the rheological characterization of activated alkali mortars.

ACS Style

Markssuel Marvila; Afonso Azevedo; Paulo Matos; Sérgio Monteiro; Carlos Vieira. Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag. Materials 2021, 14, 2069 .

AMA Style

Markssuel Marvila, Afonso Azevedo, Paulo Matos, Sérgio Monteiro, Carlos Vieira. Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag. Materials. 2021; 14 (8):2069.

Chicago/Turabian Style

Markssuel Marvila; Afonso Azevedo; Paulo Matos; Sérgio Monteiro; Carlos Vieira. 2021. "Rheological and the Fresh State Properties of Alkali-Activated Mortars by Blast Furnace Slag." Materials 14, no. 8: 2069.

Journal article
Published: 08 April 2021 in Polymers
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Multilayered armor systems (MAS) with a front ceramic layer backed by a relatively unknown Amazonian guaruman fiber-reinforced (Ischnosiphon koem) epoxy composites, as second layer, were for the first time ballistic tested against the threat of 7.62 mm rifle ammunition. The amount of 30 vol% guaruman fibers was investigated in three distinct configurations: (i) continuous aligned, (ii) 0–90° cross-laid, and (iii) short-cut randomly dispersed. Additionally, single-target ballistic tests were also carried out in the best MAS-performed composite with cross-laid guaruman fibers against .22 caliber ammunition. The results disclosed that all composites as MAS second layer attended the US NIJ standard with corresponding penetration depth of (i) 32.9, (ii) 27.5, and (iii) 29.6 mm smaller than the lethal limit of 44 mm in a clay witness simulating a personal body. However, the continuous aligned guaruman fiber composite lost structural integrity by delamination after the 7.62 projectile impact. By contrast, the composite with cross-laid guaruman fibers kept its integrity for subsequent shootings as recommended by the standard. The single-target tests indicated a relatively higher limit velocity for .22 caliber projectile perforation, 255 m/s, and absorbed energy of 106 J for the cross-laid guaruman fibers, which are superior to corresponding results for other less known natural fiber epoxy composites.

ACS Style

Raphael Reis; Larissa Nunes; Fernanda da Luz; Verônica Candido; Alisson da Silva; Sergio Monteiro. Ballistic Performance of Guaruman Fiber Composites in Multilayered Armor System and as Single Target. Polymers 2021, 13, 1203 .

AMA Style

Raphael Reis, Larissa Nunes, Fernanda da Luz, Verônica Candido, Alisson da Silva, Sergio Monteiro. Ballistic Performance of Guaruman Fiber Composites in Multilayered Armor System and as Single Target. Polymers. 2021; 13 (8):1203.

Chicago/Turabian Style

Raphael Reis; Larissa Nunes; Fernanda da Luz; Verônica Candido; Alisson da Silva; Sergio Monteiro. 2021. "Ballistic Performance of Guaruman Fiber Composites in Multilayered Armor System and as Single Target." Polymers 13, no. 8: 1203.

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.

Short communication
Published: 15 February 2021 in Journal of Materials Research and Technology
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A sequence of chemical modifications was performed on natural graphite flakes from initial oxidation, producing graphene oxide (GO), followed by thermally-reduced graphene expansion (GE) to a final sonic exfoliation forming nanoparticles (GES). Employing Raman spectroscopy, it is found that the graphite ID/IG intensity ratio of 0.86 was substantially decreased to 0.54 for GES, indicating a smaller number of more ordered graphene sheet layers. The crystalline index (CI) obtained by X-ray diffraction of the final sonic-exfoliated GES (48%) is improved in comparison to the expanded GE (31%), suggesting better-organized sheets. Scanning electron microscopy shows GES with decreasing stacking of almost transparent layers due to increased spacing between graphene sheets. Nanocomposites fabricated with 0.05, 0.1, 1.0, 3.0, and 5.0 wt.% GES incorporated into ultra-high molecular weight polyethylene, lubricated with mineral oil (UHMWPE/OM), disclosed superior CI and higher temperatures for the onset and maximum rate of thermal degradation. Dynamic mechanical analysis reveals improved viscoelastic stiffness from 1 up to 3 wt.% of GES incorporation, indicating that this novel graphene-based GES acts as reinforcement for UHMWPE/OM nanocomposites. In particular, the 3 wt.% GES nanocomposites with the best thermal and mechanical performance as well as enhanced processability might be considered a practical option for replacing structural applied common UHMWPE.

ACS Style

Vinicius De Oliveira Aguiar; Victor Jayme Roget Rodriguez Pita; Maria De Fatima Vieira Marques; Igor Tenório Soares; Erlon Henrique Martins Ferreira; Michelle Souza Oliveira; Sergio Neves Monteiro. Ultra-high molecular weight polyethylene nanocomposites reinforced with novel surface chemically modified sonic-exfoliated graphene. Journal of Materials Research and Technology 2021, 11, 1932 -1941.

AMA Style

Vinicius De Oliveira Aguiar, Victor Jayme Roget Rodriguez Pita, Maria De Fatima Vieira Marques, Igor Tenório Soares, Erlon Henrique Martins Ferreira, Michelle Souza Oliveira, Sergio Neves Monteiro. Ultra-high molecular weight polyethylene nanocomposites reinforced with novel surface chemically modified sonic-exfoliated graphene. Journal of Materials Research and Technology. 2021; 11 ():1932-1941.

Chicago/Turabian Style

Vinicius De Oliveira Aguiar; Victor Jayme Roget Rodriguez Pita; Maria De Fatima Vieira Marques; Igor Tenório Soares; Erlon Henrique Martins Ferreira; Michelle Souza Oliveira; Sergio Neves Monteiro. 2021. "Ultra-high molecular weight polyethylene nanocomposites reinforced with novel surface chemically modified sonic-exfoliated graphene." Journal of Materials Research and Technology 11, no. : 1932-1941.

Journal article
Published: 05 December 2020 in Journal of Materials Research and Technology
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Novel conjugated random and block terpolymers composed of two electron-donating blocks - fluorene (Flo) and carbazole (Cz) - as well as one electron-accepting unit of thiophene-benzothiadiazole-thiophene (TBT) with the same (Flo:TBT:Cz) molar ratio of 0.5:1:0.5 were synthesized. The effects of their microstructure on physico-chemical properties and the performance of photovoltaic conversion were characterized. These conjugated terpolymers displayed two absorption peaks in UV–Vis analysis around 400 and 600 nm with a similar and narrow bandgap (1.9 eV, UV–Vis film), which is suitable to be applied as p-type semiconductors in an organic solar cell (OSC). Both synthesized terpolymers presented a high average molecular weight and degradation temperature above 400 °C. OSCs were assembled for determining the power conversion efficiency (PCE). Block terpolymer with a PCE of 1.3%, higher than that of 0.9% for the random terpolymer, was used as the electron donor in a conventional cell configuration. The device's optimization improved the photovoltaic parameters, mainly the short circuit current density, which allowed a PCE of 3.2% to be achieved. These results demonstrate that the synthesis of block terpolymers is a simple and practical approach for optimizing a conjugated polymer for an efficient OSC.

ACS Style

Bianca Pedroso Silva Santos; Allan Bastos Lima; Francineide Lopes de Araújo; Isabela Custódio Mota; Arthur De Castro Ribeiro; Ana Flávia Nogueira; José Geraldo De Melo Furtado; Fabio Da Costa Garcia Filho; Maria De Fátima Vieira Marques; Sergio Neves Monteiro. Synthesis of novel low bandgap random and block terpolymers with improved performance in organic solar cells. Journal of Materials Research and Technology 2020, 10, 51 -65.

AMA Style

Bianca Pedroso Silva Santos, Allan Bastos Lima, Francineide Lopes de Araújo, Isabela Custódio Mota, Arthur De Castro Ribeiro, Ana Flávia Nogueira, José Geraldo De Melo Furtado, Fabio Da Costa Garcia Filho, Maria De Fátima Vieira Marques, Sergio Neves Monteiro. Synthesis of novel low bandgap random and block terpolymers with improved performance in organic solar cells. Journal of Materials Research and Technology. 2020; 10 ():51-65.

Chicago/Turabian Style

Bianca Pedroso Silva Santos; Allan Bastos Lima; Francineide Lopes de Araújo; Isabela Custódio Mota; Arthur De Castro Ribeiro; Ana Flávia Nogueira; José Geraldo De Melo Furtado; Fabio Da Costa Garcia Filho; Maria De Fátima Vieira Marques; Sergio Neves Monteiro. 2020. "Synthesis of novel low bandgap random and block terpolymers with improved performance in organic solar cells." Journal of Materials Research and Technology 10, no. : 51-65.

Journal article
Published: 03 December 2020 in Polymers
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In recent decades, the unique characteristics of natural fibers have promoted their use as reinforcement in polymeric composites. This is verified in several industrial sectors, from packaging to automotive and civil construction. Among the natural fibers, the raffia fiber extracted from the palm tree Raphia vinifera and introduced in the Amazon region a long time ago; started to be considered for the production of polymeric composites only in recent years. For the first time, the effect of raffia fiber length and its alkali treatment on the mechanical properties of a polymer composite was disclosed. Tensile tests were performed in composites with raffia fibers randomly dispersed into terephthalate-based unsaturated polyester resin. The results showed an increase in the Young’s moduli, confirmed by ANOVA, for the composite with both untreated and alkali-treated fibers in comparison to the plain polyester, which characterizes a stiffening effect. The composites with alkali treated fibers exhibited similar tensile strength values for all lengths; however, their strengths are lower than those for the untreated condition due to a weak raffia fiber/polyester matrix adhesion. Therefore, this work fills the current knowledge gap on raffia fiber incorporation in polyester matrix and valorizes this abundant Brazilian resource, providing additional information towards the use of raffia fiber in polymer composites.

ACS Style

Edwillson Gonçalves De Oliveira Filho; Fernanda Santos Da Luz; Roberto Tetsuo Fujiyama; Alisson Clay Rios Da Silva; Verônica Scarpini Candido; Sergio Neves Monteiro. Effect of Chemical Treatment and Length of Raffia Fiber (Raphia vinifera) on Mechanical Stiffening of Polyester Composites. Polymers 2020, 12, 2899 .

AMA Style

Edwillson Gonçalves De Oliveira Filho, Fernanda Santos Da Luz, Roberto Tetsuo Fujiyama, Alisson Clay Rios Da Silva, Verônica Scarpini Candido, Sergio Neves Monteiro. Effect of Chemical Treatment and Length of Raffia Fiber (Raphia vinifera) on Mechanical Stiffening of Polyester Composites. Polymers. 2020; 12 (12):2899.

Chicago/Turabian Style

Edwillson Gonçalves De Oliveira Filho; Fernanda Santos Da Luz; Roberto Tetsuo Fujiyama; Alisson Clay Rios Da Silva; Verônica Scarpini Candido; Sergio Neves Monteiro. 2020. "Effect of Chemical Treatment and Length of Raffia Fiber (Raphia vinifera) on Mechanical Stiffening of Polyester Composites." Polymers 12, no. 12: 2899.

Journal article
Published: 28 November 2020 in Polymers
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The application of cellulose nanocrystal has lately been investigated as polymer composites reinforcement owing to favorable characteristics of biodegradability and cost effectiveness as well as superior mechanical properties. In the present work novel nanocomposites of unsaturated polyester matrix reinforced with low amount of 1, 2, and 3 wt% of cellulose nanocrystals obtained from conifer fiber (CNC) were characterized. The polyester matrix and nanocomposites were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), bending test, and thermogravimetric analysis (TGA). The result showed that the addition of only 2 wt% CNC increased the nanocomposite flexural strength by 159%, the ductility by 500% and the toughness by 1420%. Fracture analyses by SEM revealed a uniform participation of the CNC in the polyester microstructure. The resistance to thermal degradation of the CNC reinforced nanocomposites was improved in more than 20 °C as compared to neat polyester. No significant changes were detected in the water absorptions and XRD pattern of the neat polyester with incorporations up to 3 wt% CNC. These results reveal that the 2 wt% CNC nanocomposite might be a promising more ductile, lightweight and cost-effective substitute for conventional glass fiber composites in engineering applications.

ACS Style

Grazielle Da Silva Maradini; Michel Picanço Oliveira; Gabriel Madeira Da Silva Guanaes; Gabriel Zuqui Passamani; Lilian Gasparelli Carreira; Walter Torezani Neto Boschetti; Sergio Neves Monteiro; Artur Camposo Pereira; Bárbara Ferreira De Oliveira. Characterization of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystals. Polymers 2020, 12, 2838 .

AMA Style

Grazielle Da Silva Maradini, Michel Picanço Oliveira, Gabriel Madeira Da Silva Guanaes, Gabriel Zuqui Passamani, Lilian Gasparelli Carreira, Walter Torezani Neto Boschetti, Sergio Neves Monteiro, Artur Camposo Pereira, Bárbara Ferreira De Oliveira. Characterization of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystals. Polymers. 2020; 12 (12):2838.

Chicago/Turabian Style

Grazielle Da Silva Maradini; Michel Picanço Oliveira; Gabriel Madeira Da Silva Guanaes; Gabriel Zuqui Passamani; Lilian Gasparelli Carreira; Walter Torezani Neto Boschetti; Sergio Neves Monteiro; Artur Camposo Pereira; Bárbara Ferreira De Oliveira. 2020. "Characterization of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystals." Polymers 12, no. 12: 2838.

Journal article
Published: 16 November 2020 in Polymers
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Graphene oxide (GO) incorporation in natural fiber composites has recently defined a novel class of materials with enhanced properties for applications, including ballistic armors. In the present work, the performance of a 0.5 vol % GO-incorporated epoxy matrix composite reinforced with 30 vol % fabric made of ramie fibers was investigated by stand-alone ballistic tests against the threat of a 0.22 lead projectile. Composite characterization was also performed by Fourier-transform infrared spectroscopy, thermal analysis and X-ray diffraction. Ballistic tests disclosed an absorbed energy of 130 J, which is higher than those reported for other natural fabrics epoxy composite, 74–97 J, as well as plain Kevlar (synthetic aramid fabric), 100 J, with the same thickness. This is attributed to the improved adhesion between the ramie fabric and the composite matrix due to the GO—incorporated epoxy. The onset of thermal degradation above 300 °C indicates a relatively higher working temperature as compared to common natural fiber polymer composites. DSC peaks show a low amount of heat absorbed or release due to glass transition endothermic (113–121 °C) and volatile release exothermic (~132 °C) events. The 1030 cm−1 prominent FTIR band, associated with GO bands between epoxy chains and graphene oxide groups, suggested an effective distribution of GO throughout the composite matrix. As expected, XRD of the 30 vol % ramie fabric-reinforced GO-incorporated epoxy matrix composite confirmed the displacement of the (0 0 1) peak of GO by 8° due to intercalation of epoxy chains into the spacing between GO layers. By improving the adhesion to the ramie fabric and enhancing the thermal stability of the epoxy matrix, as well as by superior absorption energy from projectile penetration, the GO may contribute to the composite effective ballistic performance.

ACS Style

Artur Camposo Pereira; Andreza Menezes Lima; Luana Cristyne Da Cruz Demosthenes; Michelle Souza Oliveira; Ulisses Oliveira Costa; Wendell Bruno Almeida Bezerra; Sergio Neves Monteiro; Ruben Jesus Sanchez Rodriguez; Janine Feitosa De Deus; Wagner Anacleto Pinheiro. Ballistic Performance of Ramie Fabric Reinforcing Graphene Oxide-Incorporated Epoxy Matrix Composite. Polymers 2020, 12, 2711 .

AMA Style

Artur Camposo Pereira, Andreza Menezes Lima, Luana Cristyne Da Cruz Demosthenes, Michelle Souza Oliveira, Ulisses Oliveira Costa, Wendell Bruno Almeida Bezerra, Sergio Neves Monteiro, Ruben Jesus Sanchez Rodriguez, Janine Feitosa De Deus, Wagner Anacleto Pinheiro. Ballistic Performance of Ramie Fabric Reinforcing Graphene Oxide-Incorporated Epoxy Matrix Composite. Polymers. 2020; 12 (11):2711.

Chicago/Turabian Style

Artur Camposo Pereira; Andreza Menezes Lima; Luana Cristyne Da Cruz Demosthenes; Michelle Souza Oliveira; Ulisses Oliveira Costa; Wendell Bruno Almeida Bezerra; Sergio Neves Monteiro; Ruben Jesus Sanchez Rodriguez; Janine Feitosa De Deus; Wagner Anacleto Pinheiro. 2020. "Ballistic Performance of Ramie Fabric Reinforcing Graphene Oxide-Incorporated Epoxy Matrix Composite." Polymers 12, no. 11: 2711.

Journal article
Published: 02 October 2020 in Journal of Materials Research and Technology
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In the present work, two types of composites were produced, both reinforced with 30 vol% of curaua fibers (CF). In the first type, only the fiber was functionalized with graphene oxide (GO), producing the GOCF/EM composite. While in the second, only the epoxy matrix (EM) was functionalized, producing the CF/GOEM composite. The objective of the work was to investigate the influence of functionalization with GO on the tensile properties of these produced composites. In comparison with the non GO-functionalized composite, as control CF/EM, the results revealed an increase in yield strength (64%), tensile strength (40%), Young's modulus (60%) and toughness (28%) of the CF/GOEM composite. The GOCF/EM composites for which the fibers were functionalized with GO also performed better than the CF/EM composite. The ANOVA and Tukey tests confirm this increase. As for ductility, within the standard deviation, no change was observed between samples functionalized by GO and those from the control. For the first time, comparing the results of the composites, it was demonstrated that a polymer matrix functionalized by GO offers superior tensile performance compared to the other types, keeping the same GO concentration in the composite. This fact is corroborated by the analysis of the corresponding fracture mechanisms. Preliminary results of composite with simultaneous functionalization of both fiber and epoxy matrix failed to present superior properties. This might be attributed to high amount of GO, which is apparently not a good reinforcement as the curaua fiber.

ACS Style

Ulisses Oliveira Costa; Lucio Fabio Cassiano Nascimento; Julianna Magalhães Garcia; Wendell Bruno Almeida Bezerra; Garcia Filho Fabio da Costa; Fernanda Santos da Luz; Wagner Anacleto Pinheiro; Sergio Neves Monteiro. Mechanical properties of composites with graphene oxide functionalization of either epoxy matrix or curaua fiber reinforcement. Journal of Materials Research and Technology 2020, 9, 13390 -13401.

AMA Style

Ulisses Oliveira Costa, Lucio Fabio Cassiano Nascimento, Julianna Magalhães Garcia, Wendell Bruno Almeida Bezerra, Garcia Filho Fabio da Costa, Fernanda Santos da Luz, Wagner Anacleto Pinheiro, Sergio Neves Monteiro. Mechanical properties of composites with graphene oxide functionalization of either epoxy matrix or curaua fiber reinforcement. Journal of Materials Research and Technology. 2020; 9 (6):13390-13401.

Chicago/Turabian Style

Ulisses Oliveira Costa; Lucio Fabio Cassiano Nascimento; Julianna Magalhães Garcia; Wendell Bruno Almeida Bezerra; Garcia Filho Fabio da Costa; Fernanda Santos da Luz; Wagner Anacleto Pinheiro; Sergio Neves Monteiro. 2020. "Mechanical properties of composites with graphene oxide functionalization of either epoxy matrix or curaua fiber reinforcement." Journal of Materials Research and Technology 9, no. 6: 13390-13401.

Journal article
Published: 01 October 2020 in Polymers
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The replacement of synthetic fibers by natural fibers has, in recent decades, been the subject of intense research, particularly as reinforcement of composites. In this work, the lesser known tucum fiber, extracted from the leaves of the Amazon Astrocaryum vulgare palm tree, is investigated as a possible novel reinforcement of epoxy composites. The tucum fiber was characterized by pullout test for interfacial adhesion with epoxy matrix. The fiber presented a critical length of 6.30 mm, with interfacial shear strength of 2.73 MPa. Composites prepared with different volume fractions of 20 and 40% tucum fiber were characterized by tensile and Izod impact tests, as well as by ballistic impact energy absorption using .22 ammunition. A cost analysis compared the tucum fiber epoxy composites with other natural and synthetic fiber reinforced epoxy composites. The results showed that 40 vol% tucum fiber epoxy composites increased the tensile strength by 104% and the absorbed Izod impact energy by 157% in comparison to the plain epoxy, while the ballistic performance of the 20 vol% tucum fiber composites increased 150%. These results confirmed for the first time a reinforcement effect of the tucum fiber to polymer composites. Moreover, these composites exhibit superior cost effectiveness, taking into account a comparison made with others epoxy polymer composites.

ACS Style

Michelle Souza Oliveira; Fernanda Santos Da Luz; Andressa Teixeira Souza; Luana Cristyne Da Cruz Demosthenes; Artur Camposo Pereira; Fabio Da Costa Garcia Filho; Fábio De Oliveira Braga; André Ben-Hur Da Silva Figueiredo; Sergio Neves Monteiro. Tucum Fiber from Amazon Astrocaryum vulgare Palm Tree: Novel Reinforcement for Polymer Composites. Polymers 2020, 12, 2259 .

AMA Style

Michelle Souza Oliveira, Fernanda Santos Da Luz, Andressa Teixeira Souza, Luana Cristyne Da Cruz Demosthenes, Artur Camposo Pereira, Fabio Da Costa Garcia Filho, Fábio De Oliveira Braga, André Ben-Hur Da Silva Figueiredo, Sergio Neves Monteiro. Tucum Fiber from Amazon Astrocaryum vulgare Palm Tree: Novel Reinforcement for Polymer Composites. Polymers. 2020; 12 (10):2259.

Chicago/Turabian Style

Michelle Souza Oliveira; Fernanda Santos Da Luz; Andressa Teixeira Souza; Luana Cristyne Da Cruz Demosthenes; Artur Camposo Pereira; Fabio Da Costa Garcia Filho; Fábio De Oliveira Braga; André Ben-Hur Da Silva Figueiredo; Sergio Neves Monteiro. 2020. "Tucum Fiber from Amazon Astrocaryum vulgare Palm Tree: Novel Reinforcement for Polymer Composites." Polymers 12, no. 10: 2259.