Chemical and Morphological Characterization of Guaruman Fiber

Reis, Raphael Henrique Morais; Cândido, Verônica Scarpini; Nunes, Larissa Fernandes; Monteiro, Sérgio Neves

doi:10.1007/978-3-030-10383-5_12

Cited by 4 publications

(4 citation statements)

References 19 publications

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“…Bands at 2890 and 2850 cm −1 are attributed to CH 2 vibrations, related to molecules present in cellulose and hemicellulose [ 45 ]. The bands observed in 1653 and 1737 cm −1 , Figure 12 b, correspond to C=O bonds, probably due to functional groups (carboxylic acids, aliphatic, and ketones) present in lignin and hemicellulose [ 46 , 47 ]. The bands located between 1605 to 1505 cm −1 can be attributed to vibrations in aromatic rings [ 46 ], and in 1250 cm −1 refers to the stretching of the CO bonds of phenolic groups present in the fibers constituents.…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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

et al. 2020

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“…This fact may be associated with a greater number of voids in the structure of larger-diameter fibers. The same pattern was observed for guaruman fiber, in which the thinner thickness fibers had fewer voids and open space pores and, consequently, higher density [26]. According to Moshi et al [49] low-density fibers can be indicated for the production of lighter composites with high mechanical performance.…”

Section: Dimensional Characterizationmentioning

confidence: 53%

“…The mean density value, obtained from the geometric method, was 0.43 g/cm 3 . This value is lower when compared to the densities of other NLFs from the Amazon, such as guaruman and ubim [25,26,34]. It is also observed, in Figure 3b, that the mean density decreases as the diameter increases.…”

Section: Dimensional Characterizationmentioning

confidence: 72%

“…Several studies have revealed an increase in the search for NLFs that can be used to reinforce polymeric composites, among which those found in the Amazon region stand out [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]; for instance, curaua [23,29], buriti [19,30], mallow [27,35], carnauba [38] and titica vine [39]. In addition to Amazon fibers, several other NLFs are being studied as possible reinforcements for polymer composites.…”

Section: Introductionmentioning

confidence: 99%

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Periquiteira (Cochlospermum orinocense): A Promising Amazon Fiber for Application in Composite Materials

et al. 2023

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Natural lignocellulosic fibers (NLFs) have in recent decades appeared as sustainable reinforcement alternatives to replace synthetic fibers in polymer composite material applications. In this work, for the first time, the periquiteira (Cochlospermum orinocense), a lesser known NLF from the Amazon region, was analyzed for its density and, by X-ray diffraction (XRD), to calculate the crystallinity index as well as the microfibrillar angle (MFA), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), scanning electron analysis (SEM) and tensile strength. The apparent density found for the periquiteira fiber was 0.43 g/cm3, one of the NLF’s lowest. XRD analysis indicated a crystallinity index of 70.49% and MFA of 7.32°. The TGA disclosed thermal stability up to 250 °C. The FTIR analysis indicated the presence of functional groups characteristic of NLFs. The SEM morphological analysis revealed that the periquiteira fiber presents fine bundles of fibrils and a rough surface throughout its entire length. The average strength value of the periquiteira fiber was found as 178 MPa. These preliminary results indicate that the periquiteira fiber has the potential to be used as a reinforcing agent in polymeric matrices and can generate a lightweight composite with excellent mechanical properties that can be used in various industrial sectors.

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