Modifications of Alfa fibers by alkali and hydrothermal treatment
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Moroccan Alfa plant (Stipatenacissima L) was investigated using several techniques: chemical composition, Fourier transform infrared (FTIR), crystallinity index determined by X-ray diffraction and scanning electron microscope (SEM). The raw fiber contained 39.53 wt% of cellulose, 27.63 wt% of hemicellulose, and 19.53 wt% of lignin. The longitudinal view by SEM confirmed the bundle shape. Moreover, a homogeneous distribution of various particles called trichomes with regular forms was recorded. The aim of the research is to improve the properties of Alfa fibers via a mild and effective technique in order to proceed their utilization in construction. To modify the surface, fibers were treated by sodium hydroxide (6 wt%) and hydrothermal treatment at different times. A comparison was carried on the untreated and treated Alfa fibers by several techniques. Enhanced properties were obtained with 6 h of treatment by sodium hydroxide and 1 h by hydrothermal treatment. Both treatments exhibit a modification of the fibers microstructure and morphology; FTIR and chemical analysis confirmed the hemicellulose and lignin reduction after 6 h of alkali treatment and 1 h of hydrothermal treatment. As a result, an improvement of the crystallinity index was noticed. SEM micrographs also confirmed an enhancement of the fibers roughness after treatment.
KeywordsAlfa fibers Chemical modification Alkali treatment Hydrothermal treatment Morphological behavior Microstructure
The authors gratefully acknowledge the Moroccan Center for Analysis and Characterization (CAC) affiliated to Cadi Ayyad University, for providing some sample characterizations. A special acknowledgment is expressed to CNRST (National Center for Scientific and Technical Research -Morocco) for the Merit Scholarship No. 16UCA2017.
- Arrakhiz FZ, Achaby E, Malha M, Bensalah MO, Fassi-Fehri O, Bouhfid R, Benmoussa K, Qaiss A (2013) Mechanical and thermal properties of natural fibers reinforced polymer composites: Doum/low density polyethylene. Mater Des 43:200–205. https://doi.org/10.1016/j.matdes.2012.06.056 CrossRefGoogle Scholar
- Bessadok A, Roudesli S, Marais S, Follain N, Lebrun L (2009) Alfa fibres for unsaturated polyester composites reinforcement: effects of chemical treatments on mechanical and permeation properties. Compos Part A Appl Sci Manuf 40:184–195. https://doi.org/10.1016/j.compositesa.2008.10.018 CrossRefGoogle Scholar
- Campbell AG, Kim W-J, Koch P (2007) Chemical variation in lodgepole pine with sapwood/heartwood, stem height, and variety. Wood Fiber Sci 22:22–30Google Scholar
- El Achaby M, Kassab Z, Barakat A, Aboulkas A (2018) Alfa fibers as viable sustainable source for cellulose nanocrystals extraction: application for improving the tensile properties of biopolymer nanocomposite films. Ind Crops Prod 112:499–510. https://doi.org/10.1016/j.indcrop.2017.12.049 CrossRefGoogle Scholar
- Hanana S, Elloumi A, Placet, Vincent Belghith, Hafedh Gargouri, Ali Bradai C (2016) Influence of enzymatic-based extraction process on the tensile properties of Alfa fibre. In: 1st EuroMagrebine conference on BioComposites, 28–31 Mar 2016, MarrakechGoogle Scholar
- Le Troedec M, Sedan D, Peyratout CB, Smith JP, Guinebretiere A, Gloaguen R, Vincent Krausz P (2008) Influence of various chemical treatments on the composition and structure of hemp fibres. Compos Part A Appl Sci Manuf 39:514–522. https://doi.org/10.1016/j.compositesa.2007.12.001 CrossRefGoogle Scholar
- Maghchiche A, Haouam A, Immirzi B (2013) Extraction and characterization of Algerian Alfa grass short fibers (Stipa tenacissima). Chem Chem Technol 7:339–344Google Scholar
- Neto CP, Seca A, Fradinho D, Coimbra MA, Domingues F, Evtuguin D, Cavaleiro A, Silvestre JAS (1996) Chemical composition and structural features of the macromolecular components of Hibiscus cannabinus grown in Portugal. Ind Crops Prod 5:189–196. https://doi.org/10.1016/0926-6690(96)89448-9 CrossRefGoogle Scholar
- Qaiss A, Bouhfid R, Essabir H (2015a) Effect of processing conditions on the mechanical and morphological properties of composites reinforced by natural fibres. In: Manufacturing of natural fibre reinforced polymer composites, Springer International Publishing, Cham, pp 177–197Google Scholar
- Qaiss A, Bouhfid R, Essabir H (2015b) Characterization and use of coir, almond, apricot, argan, shells, and wood as reinforcement in the polymeric matrix in order to valorize these products. In: Agricultural biomass based potential materials, Springer International Publishing, Cham, pp 305–339Google Scholar