Optimization of the alkali treatment process of date palm fibres for polymeric composites

Taha, Iman; Steuernagel, Leif; Ziegmann, Gerhard

doi:10.1163/156855407782106528

Cited by 70 publications

(34 citation statements)

References 16 publications

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“…A secondhand treatment was applied using tap water as a preliminary step of the cleaning process. In order to improve morphology structure of fibers, alkali treatment using 1 wt.% of NaOH for 2 hours (Alawar et al 2009;Taha et al 2007) was applied. Then, 20 wt.% volume of fibers was aligned based on the specified direction in the mold (200mm×200mm×5 mm) using a hand lay-up method.…”

Section: Composite Fabrication and Physical Testingmentioning

confidence: 99%

“…Scanning electron microscopy of the composite specimens fracture surfaces indicates that the Maleic Anhydride Grafted Polypropylene (MAPP) and the treated fibers improved the interfacial interaction between the fiber and the matrix (Eslami-Farsani 2014). Based on the findings, it can be concluded that its physical and mechanical properties are not directly related to increased treatment conditions (Taha et al 2007). The potential use of extracted date palm tree fiber has been investigated based on different aspects and methods (Al-Kaabi et al 2005a, 2005bAlRawahi et al 2015;Kocak and Mistik 2015;Mohanty et al 2014;Taha et al 2007;Wazzan 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Based on the findings, it can be concluded that its physical and mechanical properties are not directly related to increased treatment conditions (Taha et al 2007). The potential use of extracted date palm tree fiber has been investigated based on different aspects and methods (Al-Kaabi et al 2005a, 2005bAlRawahi et al 2015;Kocak and Mistik 2015;Mohanty et al 2014;Taha et al 2007;Wazzan 2006). In general, date palm fibers can be extracted from the stem mesh, midribs, bark and leaves or fronds.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Mechanical Properties of Aligned Date Palm Frond Fiber-Reinforced Low Density Polyethylene

et al. 2017

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Abstract:In recent decades, natural fibers have received attention of scientists and researchers due to their ecofriendly characteristics that qualify them as potential reinforcement in polymer composites in place of synthetic fibers. In this study, an experimental investigation has been conducted to evaluate the effect of orientation of fibers on mechanical properties of a newly developed bio-composite in which date palm fronds (DPF) are embedded as fibers in low-density polyethylene (LDPE) matrix. Three bio-composite sheets with orientations of 0°, 45° and 90°, respectively have been fabricated after the date palm fronds were chemically treated. The fabricated composite specimens are tested under tensile load using Universal Testing Machine (UTM) in accordance with the ASTM D-638 standard. Then, a comparison of the experimental results against analytical results is made to examine the accuracy and agreement between the two. An inconsistency in moduli, as was discovered, is attributed to the adhesion quality between the fibers and surrounding matrix. Output results help to assess the applicability of such class of bio-composites in real-life applications. The results of tensile strength, Young's modulus, and elongation at break revealed that date palm fronds can be used as reinforcement material in polymer-based composites for low strength applications. Keywords

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Section: Composite Fabrication and Physical Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of Mechanical Properties of Aligned Date Palm Frond Fiber-Reinforced Low Density Polyethylene

et al. 2017

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“…Therefore, the hemp chemical degumming process cannot employ inorganic acid and an oxidant as the main technology; instead, degumming can only incorporate alkali scouring (Kapoor et al 2001;Adamsen et al 2002;Dai and Fan 2010). To minimize damage to the fibers and their original mechanical properties, adding appropriate additives can improve the efficiency of degumming (Taha et al 2007).…”

Section: Peer-reviewed Articlementioning

confidence: 99%

An Efficient Method of Bio-Chemical Combined Treatment for Obtaining High-Quality Hemp Fiber

Fang

Chen

et al. 2017

BioResources

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This bio-chemical study focuses on obtaining high-quality hemp fiber. The effects of the structures and properties of hemp fibers in different treatment periods were studied. Moreover, the changes of the surface morphology, chemical composition, and breaking tenacity of hemp fibers were researched by scanning-electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), fluorescence microscopy, and fiber tensile testing. The results showed that by virtue of the enzyme scouring process, alkali refining process, and bleaching process, the pectin, lignin, and hemicellulose and other impurities were removed. Through the single factor experiment, the optimal process conditions for the bio-chemical combination of the degumming process were obtained. These conditions included 10 g of dried hemp fibers, 15% (v/v) pectinase solution, a temperature of 50 °C, a duration of 120 min, pH 8.0 (phosphate buffer), a liquor ratio (w/v) of 1:10, and 0.0625 mol/L NaOH. In these conditions, the residual gum content and breaking tenacity were 4.8% and 49.8 cN/tex, respectively, indicating that the treated hemp fibers met the requirements of the spinning process.Keywords: Hemp; Degumming; Residual gum Contact information: School of Environmental Engineering, Wuhan Textile University, Wuhan, Hubei Province, 430073, China; *Corresponding author: honggao_chen@hotmail.com INTRODUCTIONHemp fibers have relatively low fineness and no scratchiness, which promotes their high hygroscopicity, gas permeability, and other excellent properties. In addition, these fibers are resistant to bacteria, mold, and ultraviolet rays, and they can be used in healthcare applications (Mohanty et al. 2002;Keller 2003;Khan et al. 2014). With the low content of tetrahydrocannabinol (THC < 0.3%) that has been achieved by breeding of hemp varieties (Lachenmeier et al. 2004), hemp has gradually come to the forefront of textile applications. The hemp fiber can be blended and spun with cotton, silk, wool, and other chemical fibers, and it can also be spun into mono-fibers. However, the phloem of hemp contains hemicellulose, lignin, pectin, wax, and other chemical impurities that must be removed from the fiber surface in a key process called degumming (George et al. 2015). Degumming has significant effects on spinning quality, fabric style, and comfort. There is a direct relationship between the degumming quality and fiber properties (Sreenath et al. 1996;Nair et al. 2015).Compared with ramie fiber, hemp fiber has higher hemicellulose and lignin contents, which directly affects its spinning performance. Commonly used degumming methods include chemical degumming (Di Candilo et al. 2000;Wang et al. 2003;Thomsen et al. 2006), physical degumming (Vignon et al. 1995Dupeyre and Vignon 1998;Guo and Zhao 2010), and biological degumming (Nykter et al. 2008). PEER-REVIEWED ARTICLEbioresources.com Fang et al. (2017). "Hemp fiber degumming," BioResources 12(1), 1566-1578. 1567Because the water resistance of hemp is very strong, the fiber is difficult to ferme...

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“…On the other hand, when comparing pure chitosan film tensile strength with the one related to chitosan biocomposite containing 50 % of carnauba powder, it is observed a dramatic decrease of all measured parameters, including elastic modulus. In fact, the literature has shown that a reinforcing effect usually is achieved using very low amounts of particulate fibers (from 1 % to 5 %) [29,30] . For higher load contents, the decrease in tensile strength is normally attributed to insufficient incorporation of this high filler amount and/or poor interfacial adhesion between filler and composite matrix.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Biocomposites based on chitosan and carnauba straw powder

2014

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Abstract:In this study carnauba straw powder was submitted to chemical treatments using alkali (NaOH) or hexane, in order to increase its hydrophilicity and to investigate its potential use for the development of a biodegradable composite. Biocomposites were prepared in solution, using carnauba straw powder and chitosan as matrix, with powder contents of 10 and 50 wt %. Both, straw powder and biocomposites, were characterized by chemical composition analysis, FTIR, TGA, DSC and SEM. According to the results, the chemical treatment using NaOH was efficient in removing the soluble components of the powder and cleaning its surface. DSC analyses demonstrated that the addition of high powder loadings does not reduce the thermal stability of the composite. The elastic modulus of the biocomposites obtained with 10 wt % of untreated carnauba powder remained unaltered, decreasing for a filler content of 50 wt %. The effect of NaOH chemical treatment was more evident for the composite with 50 wt % of powder.

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Optimization of the alkali treatment process of date palm fibres for polymeric composites

Cited by 70 publications

References 16 publications

Characterization of Mechanical Properties of Aligned Date Palm Frond Fiber-Reinforced Low Density Polyethylene

Characterization of Mechanical Properties of Aligned Date Palm Frond Fiber-Reinforced Low Density Polyethylene

An Efficient Method of Bio-Chemical Combined Treatment for Obtaining High-Quality Hemp Fiber

Biocomposites based on chitosan and carnauba straw powder

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