Charpy impact test of epoxy composites reinforced with untreated and mercerized mallow fibers

Nascimento, Lúcio Fábio Cassiano; Monteiro, Sérgio Neves; Louro, Luís Henrique Leme; Luz, Fernanda Santos da; Santos, Jheison Lopes dos; Braga, Fábio de Oliveira; Marçal, Rubens Lincoln Santana Blazutti

doi:10.1016/j.jmrt.2018.03.008

Cited by 45 publications

(23 citation statements)

References 28 publications

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“…In Figure 11 a, the mechanism of fragile fracture is clearly identified, due to the “river marks” present on the impact surface of the neat epoxy specimen. The same phenomenon can be observed for the composites with 10 vol% of carnauba fibers shown in Figure 11 b, presenting a low effective reinforcement by the fibers for the composites with this volumetric fraction [ 43 ].…”

Section: Resultssupporting

confidence: 66%

Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites

et al. 2020

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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.

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Section: Resultssupporting

confidence: 66%

Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites

et al. 2020

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“…This implies that there was a decrease in lignin content of the NaOH-treated coir fibres but lignin is much more difficult to be completely removed by alkalization compared to hemicelluloses (Oushabi et al 2017;Sinha & Rout 2009). The absorption bands at 1031.92, 1035.77 and 1029.99 cm -1 for the untreated coir fibre, 24 and 48 h NaOH treated-coir fibres, respectively, were attributed to C-O stretching in cellulose, hemicelluloses and lignin (Nascimento et al 2018).…”

Section: Water Absorption Testmentioning

confidence: 97%

“…FOURIER TRANSFORM INFRARED (FTIR) SPECTROSCOPY ANALYSIS OF COIR FIBRES Figure 2 shows the comparison of FTIR spectra of untreated, 24 h NaOH-treated and 48 h NaOH-treated coir fibres within the 650-4000 cm -1 wavelength region. It was found that the absorption bands at 3340.71, 3344.57 and 3350.35 cm -1 correspond to the hydroxyl group (OH) in untreated coir fibre, 24 h NaOH-treated and 48 h NaOH-treated coir fibres, respectively (Akhtar et al 2016;Nascimento et al 2018). It can be observed that the intensity of OH group in the coir fibre was significantly reduced after both 24 and 48 h alkaline treatment, indicating that the alkaline treatment breaks the hydrogen bonding in the OH group, caused the reduction of the OH groups in the NaOH-treated coir fibres.…”

Section: Water Absorption Testmentioning

confidence: 99%

Effect of Alkaline Treatment on Structural Characterisation, Thermal Degradation and Water Absorption Ability of Coir Fibre Polymer Composites

Yew¹,

Muhamad²,

Mohamed³

et al. 2019

JSM

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The alkaline treatment with 5 wt. % sodium hydroxide (NaOH) solution at room temperature for 24 and 48 h was performed on coir fibre. The structural characterisation, thermal degradation and water absorption ability of the untreated and NaOH-treated coir fibre polymer composites have been studied. Scanning electron microscope (SEM) images showed that coir fibres treated with NaOH have rough surface texture and the roughness of the fibre surface becomes significant as the duration of the NaOH treatment increased. Fourier transform infrared (FTIR) spectra confirmed that NaOH treatment removed hemicelluloses as evidenced by the absence of absorption bands at 1724.36 cm-1 and changes the absorption intensity at bands 1244.09 cm-1 and 1249.87 cm-1 due to the loss of lignin. NaOH-treated coir fibre composites demonstrated better thermal stability at low temperature degradation. At high temperature, the thermal stability was reduced due to the decreased of residual lignin content. The water absorption of the NaOH-treated coir fibre composites was lower than untreated coir composite contributed by better interfacial adhesion between the NaOH-treated coir fibre to epoxy resin.

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“…With a view to understand the importance of the present study, a comparison of the three mechanical properties evaluated for the ERC composite is made with earlier reported values for various epoxy-based composites containing the fabrics of different fibers [ 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. Table 2 shows this comparison.…”

Section: Resultsmentioning

confidence: 99%

“…The polymer used as matrix was a commercially available epoxy resin—bisphenol A diglycidyl ether (DGEBA) resin mixed with triethylenetetramine (TETA) hardener, stoichiometric phr = 13, both supplied by EpoxyFiber, Brazil. The volumetric fraction of fabric reinforcement was set as 30% in order to allow a comparison to other NLFs/epoxy composites [ 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. Figure 2 schematically illustrates a suggested model for the molecular structure of the fabric facing an epoxy macromolecule in the matrix.…”

Section: Methodsmentioning

confidence: 99%

Mechanical Properties of Boehmeria nivea Natural Fabric Reinforced Epoxy Matrix Composite Prepared by Vacuum-Assisted Resin Infusion Molding

et al. 2020

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Natural lignocellulosic fibers and corresponding fabrics have been gaining notoriety in recent decades as reinforcement options for polymer matrices associated with industrially applied composites. These natural fibers and fabrics exhibit competitive properties when compared with some synthetics such as glass fiber. In particular, the use of fabrics made from natural fibers might be considered a more efficient alternative, since they provide multidirectional reinforcement and allow the introduction of a larger volume fraction of fibers in the composite. In this context, it is important to understand the mechanical performance of natural fabric composites as a basic condition to ensure efficient engineering applications. Therefore, it is also important to recognize that ramie fiber exhibiting superior strength can be woven into fabric, but is the least investigated as reinforcement in strong, tough polymers to obtain tougher polymeric composites. Accordingly, this paper presents the preparation of epoxy composite containing 30 vol.% Boehmeria nivea fabric by vacuum-assisted resin infusion molding technique and mechanical behavior characterization of the prepared composite. Obtained results are explained based on the fractography studies of tested samples.

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Charpy impact test of epoxy composites reinforced with untreated and mercerized mallow fibers

Cited by 45 publications

References 28 publications

Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites

Copernicia Prunifera Leaf Fiber: A Promising New Reinforcement for Epoxy Composites

Effect of Alkaline Treatment on Structural Characterisation, Thermal Degradation and Water Absorption Ability of Coir Fibre Polymer Composites

Mechanical Properties of Boehmeria nivea Natural Fabric Reinforced Epoxy Matrix Composite Prepared by Vacuum-Assisted Resin Infusion Molding

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