Physico-chemical characterization of Grewia Monticola Sond (GMS) fibers for prospective application in biocomposites

Almeshaal, Mohammed A.; Palanisamy, Sivasubramanian; Murugesan, Thulasi Mani; Murugesan, Punniyamoorthy; Santulli, Carlo

doi:10.1080/15440478.2022.2123076

Cited by 11 publications

(13 citation statements)

References 55 publications

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“…The transformations that occur during thermal degradation of MMB (Figure 6(d)), MMK (Figure 6(e)) and MMKW (Figure 6(f)) fibres were identified using DSC analyses. The shape of the DSC thermogram of the MMB fibre shows three distinct peaks and is similar to the thermograms of the Strelitzia reginae 11 and Grewia Monticola 40 raw fibres. The first peak at 65.6°C shows that evaporation of moisture resulted in an endothermic transformation with an enthalpy of 43.87 J.g −1 .…”

Section: Resultssupporting

confidence: 67%

“…Furthermore, the cellulose content values are between 50 and 85 wt%, which is consistent with commonly used reinforcing fibres in construction composites. 14,39,40 The cellulose content of MMKW fibres is 10% and 17.8% higher than that obtained for MMK and MMB fibres, respectively.…”

Section: Chemical Compositionmentioning

confidence: 74%

“…The lignin content is lower for MMKW (7.4 wt.%) than for MMK (8.8 wt.%) and MMB (10.9 wt.%), showing the effectiveness of chemical retting and NaClO bleaching for lignin removal. The lignin content of MMKW is almost half that of Grewia monticola 40 and banana 36 fibres. On the other hand, it is of the same order as that of sisal fibre 35 commonly used in plaster reinforcement.…”

Section: Resultsmentioning

confidence: 91%

“…Indeed, cellulose is the constituent that strengthens the fibre structure. 40,52 It is also noted that NaClO bleaching decreased the mechanical properties of the MMKW fibre, despite its higher cellulose content (Table 1). This suggests that the 2.5 wt.% NaClO concentration partially damages the cellulose 13,46 of the MMK fibre.…”

Section: Resultsmentioning

confidence: 92%

“…38,39 The peak observed at 1730 cm À1 is related to symmetric stretching vibrations of the C = O groups of esters and/or carboxylic acids involving the presence of xylans and/or lignin. 10,40 The peak at 1630 cm À1 is related to absorbed residual water molecules. 13 The peak at 1230 cm À1 corresponds to the stretching vibration of the C = O bonds of the condensed guaiacyl units of lignin.…”

Section: Ftir Spectrum Of the Fibresmentioning

confidence: 99%

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Extraction and characterization of a novel tropical fibre Megaphrynium macrostachyum as a biosourced reinforcement for gypsum-based biocomposites

Betené,

Batoum,

Ndoumou Belinga

et al. 2023

Journal of Composite Materials

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Identifying the potential of new bast fibres is a solution for diversifying biobased reinforcements and replacing environmentally harmful synthetic fibres. In this study, fibres were extracted from Megaphrynium macrostachyum stems by biological and chemical retting. The chemical fibres were bleached with a 2.5wt% sodium hypochlorite (NaClO) solution. The biological, chemical and bleached fibres were analysed from a chemical, morphological, physical, mechanical and thermal point of view. The possibility of using these fibres as reinforcement in gypsum-based biocomposites for construction was analysed by three-point bending tests. Chemical analysis revealed a cellulose content of more than 56 wt% within the usual range (50-85 wt%) for reinforcing fibres. SEM images showed that bleaching cleans the surface of the fibres. Physical analysis by gravimetric analysis showed that the bleached fibre had the lowest density (1.01 g.cm−3), fineness (5.2tex) and water absorption (64wt%). In addition, the highest thermal stability (237°C) was obtained for the chemical fibre. Young’s modulus and tensile strength, evaluated according to ASTM D3822-07, were dispersed and depended on the fibre diameter, and the highest values were obtained for the chemical fibre (6.4 GPa and 251 MPa). In contrast, gypsum composites with a volume fraction of 1.5% bleached chemical fibre had the highest stiffness (258 MPa) and flexural strength (5 MPa). The results obtained for each fibre type are relatively close to those of other fibres in the literature, indicating that all three fibre types studied can be used as alternative raw materials for the manufacture of gypsum-based biocomposites.

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Section: Resultssupporting

confidence: 67%

Section: Chemical Compositionmentioning

confidence: 74%