Properties Characterization of Chemically Modified  Hemp Hurds

Števulová, Nadežda; Cigasova, Julia; Estokova, Adriana; Terpáková, Eva; Geffert, Anton; Kačík, František; Singovszká, Eva; Holub, Marián

doi:10.3390/ma7128131

Cited by 183 publications

(113 citation statements)

References 43 publications

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“…This is accordance with [11], where chemical modification of hemp hurds led to cleaning the surface repulped of hurds slices and improvement of the adhesion between the fibers and inorganic matrix. The study of hemp hurds properties after alkaline treatment in [5] confirmed changes in defibrillation of bundles, chemical and phase composition, cellulose crystallinity and degree of cellulose polymerization. Compressive strength values of composites increase with increasing hardening time, as shown in Table 2.…”

Section: Resultsmentioning

confidence: 95%

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New biocomposites based on hemp hurds

2015

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Section: Resultsmentioning

confidence: 95%

“…The mean particle length of hemp hurds, chemical composition changed by treatment and binder nature as the most important parameters controlling the mechanical properties of composites were investigated [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

New biocomposites based on hemp hurds

2015

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“…7C), and bleaching (Fig. 7D) showed the typical cellulose bands at 899 cm -1 (symmetric stretch, in-plane(C-O-C) of β-(1→4)-glycosidic linkages), indicating that the cellulose structure had few changes during degumming (Stevulova et al 2014). The band at 1730 cm -1 was attributed to the C=O stretching of ester groups and carbonyl in pectin and hemicellulose (Sisti et al 2016).…”

Section: Ft-ir Analysesmentioning

confidence: 98%

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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“…According to Stevulova et al (2014), peak at wavelength 2800-3400 cm -1 indicates polysaccharides, 1300-1400 cm -1 indicates cellulose, 1028 and 1733 cm -1 shows hemicellulose groups, whereas wavelength 1500-1600 cm -1 shows a lignin group. Figure 2 shows that the standard FTIR spectrum of cellulose and the Figure 2.…”

Section: Characteristics Of Seaweed Processing Wastementioning

confidence: 99%

Bioethanol Production From Seaweed Processing Waste by Simultaneous Saccharification and Fermentation (Ssf)

Hakim

Chasanah²,

Uju³

et al. 2017

Squalen Bull. Marine Fisheries Postharvest Biotech.

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Seaweed processing waste has been used for bioethanol production through simultaneous saccharification and fermentation (SSF). SSF is commonly used for bioethanol production to shorten the process and to increase the yield of ethanol produced by Trichoderma reesei and Saccharomyces cerevisiae. The aim of this research was to obtain the best concentration of T. reesei and S. cerevisiae to produce bioethanol by SSF. The concentration of T. reesei and S. cerevisiae used was 0 (control), 5, 10, 15 and 20% (v/v (control, 5, 10, 15 and 20%) yielded significant effect (p<0.05) on the total reducing sugars and ethanol produced. The Duncan Multiple Range Test (DMRT) showed that the treatment 10% of T. reesei and S. cerevisiae concentration in the seaweed processing waste treated with hot water was the best treatment producing highest yield of ethanol.

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Properties Characterization of Chemically Modified Hemp Hurds

Cited by 183 publications

References 43 publications

New biocomposites based on hemp hurds

New biocomposites based on hemp hurds

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

Bioethanol Production From Seaweed Processing Waste by Simultaneous Saccharification and Fermentation (Ssf)

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