Prediction of the equilibrium moisture content based on the chemical composition and crystallinity of natural fibres

Sweygers, Nick; Depuydt, Delphine; Eyley, Samuel; Thielemans, Wim; Mosleh, Yasmine; Ivens, Jan; Dewil, Raf; Appels, Lise; Vuure, Aart Willem Van

doi:10.1016/j.indcrop.2022.115187

Cited by 20 publications

(18 citation statements)

References 55 publications

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“…Hill et al [13] studied the water vapor adsorption behavior of a series of natural fibers (jute, flax, coir, cotton, hemp, Sitka spruce) employing the HÀ H model. In general, the main factors that affect the hygroscopicity of fiber structure can be summarized in the following four aspects: chemical composition, crystallinity, specific surface area and internal pores of fibers, accompanying substances and impurities in fibers [15,[20][21][22]. Sweygers et al [20].…”

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confidence: 99%

Hygroscopicity of nitrocellulose with different nitrogen content

Cao,

Nan,

Zheng

et al. 2024

Propellants Explo Pyrotec

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Research on the hygroscopic behavior of NC is essential because it affects the mechanical properties, combustion properties, and safe storage of NC‐based products. In this study, Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), and scanning electron microscopy (SEM) are used to characterize the chemical structure, crystal structure, and microscopic morphology of NC, respectively. The moisture adsorption isotherms of NC fibers with different nitrogen content are determined by dynamic vapor sorption (DVS) and fitted with Hailwood‐Horrobin (H−H) and Guggenheim‐Anderson‐de Boer (GAB) models. The specific surface area and surface energy of NC are also measured by inverse gas chromatography (IGC). The results show that as the nitrogen content of NC increases, the intensity of the −OH characteristic absorption peak is weakened, the crystallinity does not change much, the number of cracks and pores on the NC fiber surface increases, and the equilibrium moisture content (EMC) of the NC decreases in general. In addition, the fitting results based on the H−H and GAB models show that, under low humidity conditions, the EMC value of NC is determined by the adsorbed water content of the monolayer, which is mainly related to the −OH content in NC. However, with the increase of humidity, the EMC value of NC is gradually determined by the multilayer adsorbed water content, which is influenced by both the nitrogen content and the fiber cleavage structure. Meanwhile, the IGC results show that the surface energy of the NC consists mainly of the dispersive surface energy (values >46 mJ m−2), with the specific surface energy contributing approximately 25 mJ m−2. The total surface energy of NC and the bonding strength between NC molecules and water molecules decrease with increasing nitrogen content.

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confidence: 99%

Hygroscopicity of nitrocellulose with different nitrogen content

Cao,

Nan,

Zheng

et al. 2024

Propellants Explo Pyrotec

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“…The crystalline phases of the copper-containing particles were identified by comparing the measured pattern with archives in the XRD reference database. X-ray phase analysis of copper-containing particles was complicated not only by their large number of phases, but also by the high crystallinity of the fibers themselves [ 50 , 51 , 52 , 53 , 54 ], from which the textile materials used in the studies were made, as well as by the diversity of their origins. Therefore, X-ray diffraction patterns of only copper-containing particles shaken out of the modified textile samples were recorded.…”

Section: Resultsmentioning

confidence: 99%

Effect of Reducing Agent on Characteristics and Antibacterial Activity of Copper-Containing Particles in Textile Materials

et al. 2022

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Textile materials modified with copper-containing particles have antibacterial and antiviral properties that have prospects for use in healthcare. In the study, textile materials were saturated with copper-containing particles in their entire material volume by the absorption/diffusion method. The antibacterial properties of modified textile materials were confirmed by their inhibitory effect on Staphylococcus aureus, a Gram-positive bacterium that spreads predominantly through the respiratory tract. For the modification, ordinary textile materials of various origins and fiber structures were used. Technological conditions and compositions of modifying solutions were established, as well as the most suitable textile materials for modification. To assess the morphological and physical characteristics of copper-containing particles and the textile materials themselves, X-ray diffraction, a scanning electron microscope, and an energy-dispersive X-ray spectrum were used. In modified textile samples, XRD data showed the presence of crystalline phases of copper (Cu) and copper (I) oxide (Cu2O). On the grounds of the SEM/EDS analysis, the saturation of textile materials with copper-containing particles depends on the structure of the textile materials and the origins of the fibers included in their composition, as well as the modification conditions and the copper precursor.

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“…Samples placed outdoors for three years are less crystalline than those stored indoors for three years, and bamboo stored for three years is more weathered in the outdoor environment than in the indoor environment. The high lignin content of bamboo helps it to maintain its structural integrity during storage [ 28 ], e.g., indoor storage. In conclusion, the short-term hygrothermal ageing for one month is inadequate in affecting the crystallinity of bamboo cellulose.…”

Section: Resultsmentioning

confidence: 99%

Effects of Accelerated Ageing by Humidity and Heat Cycles on the Quality of Bamboo

Jia

Chen²,

Fei

et al. 2022

Polymers

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The effect of humidity and heat environmental conditions on the durability of conventional bamboo materials is a pressing issue in the reserving phase of biomass materials. In this study, the relationship between the main physicochemical, pyrolytic, and mechanical properties of bamboo before and after ageing has been investigated. Exposure of engineered bamboo raw materials with moisture content up to 10% to alternating humidity and heat cycles (20 °C 98% RH-30 °C 64% RH-40 °C 30% RH) of ageing (HHT) causes degradation of the chemical polymer matrix. Byk Gardner 6840 color difference meter, X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), compression intensity, thermogravimetric-infrared spectroscopy (TG-IR), and density changes are used to assess the quality of the material before and after ageing. No significant changes in the moisture content within the range of 6.12 ± 0.327 after two weeks of the engineered bamboo during wet thermal cyclic ageing were determined. However, there were significant differences in mass loss (7.75–9.93 g), cellulose crystallinity, chemical changes, compression strength, and pyrolytic properties. Differences in specimen colors were observed during 10 weeks of the accelerated humidity heat cycling ageing, and TCD variations ranged from 3.75 to 20.08 and from 0.25 and 3.24, respectively. Reduced cellulose crystallinity (36.459–22.638%), axial compressive strength (63.07–88.09 MPa), and modulus of rupture (2409–4286 MPa) were found during aging, whereas deformation and ductility properties were improved. Both natural and humidity heat ageing improve thermal stability and peak pyrolysis rates (0.739–0.931; 0.731–0.797). Humidity heat cyclic ageing will assist in the design and risk assessment of warehousing environments for industrial applications.

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Prediction of the equilibrium moisture content based on the chemical composition and crystallinity of natural fibres

Cited by 20 publications

References 55 publications

Hygroscopicity of nitrocellulose with different nitrogen content

Hygroscopicity of nitrocellulose with different nitrogen content

Effect of Reducing Agent on Characteristics and Antibacterial Activity of Copper-Containing Particles in Textile Materials

Effects of Accelerated Ageing by Humidity and Heat Cycles on the Quality of Bamboo

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