Mechanical Properties, Critical Length, and Interfacial Strength of Seven-Islands-Sedge Fibers (Cyperus malaccensis) for Possible Epoxy Matrix Reinforcement

Neuba, Lucas de Mendonça; Junio, Raí Felipe Pereira; Monteiro, S. N.; Ribeiro, Matheus Pereira; Silveira, Pedro Henrique Poubel Mendonça da; Silva, Thuane Teixeira da; Pereira, Artur Camposo; Monteiro, Sérgio Neves

doi:10.3390/polym14183807

Cited by 13 publications

(5 citation statements)

References 55 publications

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“…To obtain the Gaussian curve, the Origin Pro software version 2023b was used, using some steps to determine the T value. To obtain it, it is necessary to remove the baseline from the diffractogram, and thus, it is possible to determine the Gaussian of the 002 plane [39,40]. The T value is called the angle between the line from the center of the Gaussian peak to the intersection point between the first derivative and the second derivative.…”

Section: Microfibril Anglementioning

confidence: 99%

Babassu Coconut Fibers: Investigation of Chemical and Surface Properties (Attalea speciosa.)

Chaves,

da Silveira,

Monteiro

et al. 2023

Polymers

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To complement previous results, an analysis of the chemical and morphological properties of babassu fibers (Attalea speciosa Mart. ex Spreng.) was conducted in order to evaluate their potential as reinforcements in the production of composites with epoxy matrix. The diameter distribution was analyzed in a sample of one hundred fibers, allowing the verification of its variation. The determination of the chemical properties involved experimental analyses of the constituent index and X-ray diffraction. The diffractogram was used to calculate the crystallinity index and the microfibril angle, which are crucial parameters that indicate the consistency of the mechanical properties of babassu fibers and the feasibility of their use in composites. The results revealed that babassu fiber has a chemical composition, with contents of 28.53% lignin, 32.34% hemicellulose, and 37.97% cellulose. In addition, it showed a high crystallinity index of 81.06% and a microfibril angle of 7.67°. These characteristics, together with previous results, indicate that babassu fibers have favorable chemical and morphological properties to be used as reinforcements in composites, highlighting its potential as an important material for applications in technology areas.

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Section: Microfibril Anglementioning

confidence: 99%

Babassu Coconut Fibers: Investigation of Chemical and Surface Properties (Attalea speciosa.)

Chaves,

da Silveira,

Monteiro

et al. 2023

Polymers

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“…O maior valor E' para a EP na Figura 1, pode estar relacionado ao comportamento da fibra de junco CM dentro da matriz. Como reportado previamente [9], a interface fibra de junco/epóxi nos compósitos é relativamente fraca causando a redução no módulo de armazenamento. Além disso, no caso dos nanocompósitos 30 FJ/EP-GO a maior perda no valor de E' pode ser associada com o efeito do GO no comportamento viscoelástico, podendo reduzir o módulo de armazenamento.…”

Section: Resultsunclassified

“…Especialmente como reforço para compósitos em termos de características tribológicas, propriedades mecânicas, comportamento térmico e análises morfológicas [1][2][3][4][5][6][7]. Em particular, fibras obtidas da espécie Cyperus malaccensis estão sendo avaliadas pelo seu comportamento térmico e densidade [8], assim como propriedades mecânicas [9], desempenho balístico [10] e fabricação de papel [11].…”

Section: Introductionunclassified

ANáLISE TERMO E DINâMICO MECâNICAS DAS FIBRAS DE JUNCO-SETE-ILHAS (CYPERUS MALACCENSIS) REFORçANDO UM NANOCOMPóSITO DE MATRIZ EPóXI COM GO INCORPORADO

Neuba,

Junio,

Souza

et al. 2023

ABM Proceedings

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ResumoAs fibras de junco-sete-ilhas extraídas da planta Cyperus malaccensis (CM) foram recentemente descobertas como um promissor reforço para compósitos poliméricos. A incorporação de 30 % em volume de fibras de junco CM melhoraram a resistência ao impacto, tração e módulo de elasticidade dos compósitos de epóxi com uma pequena diferença em seus parâmetros termogravimétricos. No entanto, o comportamento dinâmico-mecânico viscoelástico ainda precisa ser investigado para a completa caracterização desses compósitos tendo em vista futuras aplicações de engenharia. Portanto, essa pesquisa foca em investigar a análise dinâmicomecânica (DMA) e termomecânica (TMA) para nanocompósitos de matriz epóxi incorporada com óxido de grafeno contendo 30% em volume de fibra de junco CM. Em comparação ao grupo controle (epóxi sem tratamento) o fator de amortecimento (Tan δ), sendo a razão do módulo da perda sob o armazenamento, é aumentada significativamente de 0,45 para 0,75 para os compósitos reforçados com 30% de fibras de junco CM. As descobertas de TMA revelaram apenas pequenas variações na temperatura de transição vítrea (119-124 °C), assim como o coeficiente de expansão térmica (168 x 10 -6 a 220 x 10 -6 /°C). Esses resultados de DMA e TMA revelam ser promissores os efeitos das fibras de junco CM reforçando um nanocompósito de matriz epóxi incorporada com GO e a contribuição nas respostas viscoelásticas. Palavras-chave: Fibra de junco-sete-ilhas; Compósitos epóxi; Análise dinâmicomecânica; Mecanismo de fratura; Análise termomecânica. THERMAL MECHANICAL AND DYNAMIC MECHANICAL ANALYSIS OF SEDGE FIBERS (Cyperus malaccensis

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“…The Origin Pro software was used to obtain the Gaussian curve, following several steps to determine the T value. To do so, it is necessary to remove the baseline from the diffractogram, allowing for the determination of the Gaussian curve for the 002 plane [ 56 , 57 , 58 ]. The T value represents the angle between the line from the center of the Gaussian peak and the intersection point between the first and second derivative.…”

Section: Methodsmentioning

confidence: 99%

Characterization of Thermo-Mechanical and Chemical Properties of Polypropylene/Hemp Fiber Biocomposites: Impact of Maleic Anhydride Compatibilizer and Fiber Content

et al. 2023

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This article presents a comprehensive study on the physical, mechanical, thermal, and chemical properties of polypropylene (PP) composites reinforced with hemp fibers (HF) and compatibilized with maleic anhydride (MAPP). The composites were processed using a twin-screw extruder, followed by hot compression at 190 °C. Subsequently, the composites were analyzed using Izod impact and Shore D hardness tests to evaluate their mechanical properties. Thermal properties were investigated through differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), while X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) were employed to study their chemical properties. Additionally, a statistical analysis was conducted to compare the average results of the impact and hardness tests. XRD analysis revealed that the addition of HF and MAPP led to the disappearance of peaks corresponding to the beta phase in pure PP. Hemp fibers exhibited an impressive crystallinity of 82.10%, surpassing other natural fibers, and had a significant molecular orientation angle (MFA) of 6.06°, making them highly desirable for engineering applications. The crystallite size was observed to be relatively large, at 32.49 nm. FTIR analysis demonstrated strong interactions between the fiber, compatibilizing agent, and polymer matrix. TGA tests showed that the addition of 5 and 10 wt.% MAPP resulted in complete degradation of the composites, similar to pure PP. DSC analyses indicated a reduction in crystallinity (Xc) due to the incorporation of HF and MAPP. Shore D hardness tests revealed an increase in hardness with the addition of 5 wt.% MAPP, while a steep decline in this property was observed with 10 wt.% MAPP. In terms of impact resistance, fractions of 3 and 5 wt.% MAPP in the composites exhibited improved performance compared to the pure polymer. Analysis of variance (ANOVA) was employed to ensure the statistical reliability of the mechanical test results. This comprehensive study sheds light on the diverse properties of PP composites reinforced with hemp fibers and compatibilized with MAPP, emphasizing their potential as sustainable materials for engineering applications. The results contribute to the understanding of the structural and functional aspects of these composites, guiding future research and developments in the field.

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Mechanical Properties, Critical Length, and Interfacial Strength of Seven-Islands-Sedge Fibers (Cyperus malaccensis) for Possible Epoxy Matrix Reinforcement

Cited by 13 publications

References 55 publications

Babassu Coconut Fibers: Investigation of Chemical and Surface Properties (Attalea speciosa.)

Babassu Coconut Fibers: Investigation of Chemical and Surface Properties (Attalea speciosa.)

ANáLISE TERMO E DINâMICO MECâNICAS DAS FIBRAS DE JUNCO-SETE-ILHAS (CYPERUS MALACCENSIS) REFORçANDO UM NANOCOMPóSITO DE MATRIZ EPóXI COM GO INCORPORADO

Characterization of Thermo-Mechanical and Chemical Properties of Polypropylene/Hemp Fiber Biocomposites: Impact of Maleic Anhydride Compatibilizer and Fiber Content

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