Special Features of X-ray Analysis of Cellulose Crystallinity and Content in Flax Fibres

Moryganov, A. P.; Zavadskii, A. E.; Stokozenko, V. G.

doi:10.1007/s10692-018-9904-4

Cited by 13 publications

(9 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The X-ray diffractograms of flax fibers and flax-based ACCs are shown in Figure 6a. The main diffraction peaks of flax are typical for cellulose I from higher plant cellulose [45]. The flax fibers contained cellulose I with a crystallinity of 44.6%.…”

Section: Crystallinity Of the Accsmentioning

confidence: 96%

Unidirectional All-Cellulose Composites from Flax via Controlled Impregnation with Ionic Liquid

et al. 2020

View full text Add to dashboard Cite

Mechanically strong all-cellulose composites are very attractive in the terms of fully bio-based and bio-degradable materials. Unidirectional flax-based all-cellulose composites are prepared via facile room-temperature impregnation with an ionic liquid, 1-ethyl-3-methyl imidazolium acetate. To determine the optimal processing conditions, the kinetics of flax dissolution in this solvent is first studied using optical microscopy. Composite morphology, crystallinity, density, the volume fraction of cellulose II and tensile properties are investigated, indicating that flax dissolution should be within certain limits. On the one hand, the amount of cellulose II formed through dissolution and coagulation should be high enough to “fuse” flax fibers, resulting in a density increase. On the other hand, only the surface layer of the fibers should be dissolved to maintain the strength provided by the inner secondary layer and avoid a detrimental decrease in crystallinity. The highest Young’s modulus and strength, 10.1 GPa and 151.3 MPa, respectively, are obtained with a crystallinity of 43% and 20 vol% of cellulose II.

show abstract

Section: Crystallinity Of the Accsmentioning

confidence: 96%

Unidirectional All-Cellulose Composites from Flax via Controlled Impregnation with Ionic Liquid

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Therefore, the extraction process is beneficial for improving the acoustic vibrational characteristics of spruce wood (Zhang and Xu 2019). Also, the increase in the relative crystallinity of wood will increase the elastic modulus of wood, thus increasing the specific dynamic elastic modulus E L /ρ and sound transmission speed of the wood, and improving the acoustic vibrational properties (Moryganov et al 2018).…”

Section: Discussionmentioning

confidence: 99%

Effect of extraction on the acoustic vibrational properties of Picea jezoensis var. microsperma (Lindl.) W.C.Cheng & L.K.Fu

Miao

Qian

et al. 2021

Annals of Forest Science

View full text Add to dashboard Cite

Key message The specific dynamic elastic modulus, acoustic radiation, logarithmic decrement, sound transmission parameter, and acoustic conversion efficiency of spruce wood (Picea jezoensis var. microsperma (Lindl.) W.C.Cheng & L.K.Fu) were improved by extraction treatment with deionized water, dichloromethane, benzyl alcohol, and ethanol. A larger improvement was achieved after extraction with benzoyl alcohol and dichloromethane extraction than by using ethanol and deionized water.• Context It is necessary to improve the acoustic vibrational properties of wood to solve the problem of resource shortage of wood with excellent acoustic vibrational properties for the soundboards of musical instruments and to improve the use value of wood. • AimsThe effects of extraction treatment with deionized water, dichloromethane, benzyl alcohol, and ethanol on the acoustic vibrational properties of spruce wood were evaluated.• Methods After the acoustic vibrational properties of untreated wood samples were measured using the free-free flexural vibration test method with a fast Fourier transform spectrum analyzer (FFT, CF-5220Z), extraction treatment of the wood samples was separately performed with deionized water, dichloromethane, benzyl alcohol, and ethanol for 15 days at room temperature and pressure, followed by drying. The acoustic vibrational properties of the treated wood samples were then measured, and the effect of extraction treatment on the acoustic vibrational properties was analyzed. • ResultsThe increase in the specific dynamic elastic modulus was highest (14.5%) after the benzyl alcohol treatment. The acoustic radiation clearly improved after the ethanol treatment (18.1%). The acoustic impedance of the wood treated by dichloromethane extraction decreased significantly (−4.35%), while the logarithmic decrement was significantly reduced (−52.0%) by benzyl alcohol treatment. From the viewpoint of energy utilization, with benzyl alcohol treatment, the acoustic conversion efficiency and transmission parameter increased by 124% and 125%, respectively. • ConclusionThe degree of improvement in the acoustic vibrational properties of wood differed depending on the solvent used. Greater improvement was observed after extraction with benzoyl alcohol and dichloromethane as compared to ethanol and deionized water.

show abstract

“…To better understand the swelling behavior of the selected materials, a few physical properties need to be characterized. The number-average (Mn) and weight-average (Mw) molecular weights of cellulose in each fiber are presented in Table 1, Cell-I has a crystallinity index of approximately 49.8%, typical for plant cellulose (Placet et al 2012;Moryganov et al 2018;Chen et al 2020). DWP has a slightly lower crystallinity than cotton due to intensive pulping procedures and a small amount of amorphous hemicellulose.…”

Section: Physico-chemical Properties Of Cellulose Fibersmentioning

confidence: 99%

Single fiber swelling behavior for natural and man-made cellulose fibers under alkaline treatment

You¹,

Chen

et al. 2021

Cellulose

View full text Add to dashboard Cite

Swelling behavior of cotton, dissolving wood pulp (DWP), viscose staple fiber, and Tencel staple fiber in varying sodium hydroxide (NaOH) concentration were investigated by means of optical microscopy and were characterized by molecular mass distribution, X-ray diffractometer, and dynamic vapor sorption. The effect of temperature (20-45 °C) and duration (0-120 min) was studied. The results reveal that the swelling ratio of fiber in alkali solution depends on fiber accessibility and NaOH concentration. Viscose staple fiber exhibited the highest swelling ratio and lowest swelling ratio observed for dissolving wood pulp fiber among all the materials. The cotton or DWP fibers provide maximum swelling during alkaline steeping (18wt % lye) at higher temperatures, i.e., 45 °C. As for viscose staple fiber and Tencel staple fiber, using 12 wt% lye concentration and steeping at lower temperatures, i.e., 20 °C allowed maximum swelling behavior

show abstract

Special Features of X-ray Analysis of Cellulose Crystallinity and Content in Flax Fibres

Cited by 13 publications

References 9 publications

Unidirectional All-Cellulose Composites from Flax via Controlled Impregnation with Ionic Liquid

Unidirectional All-Cellulose Composites from Flax via Controlled Impregnation with Ionic Liquid

Effect of extraction on the acoustic vibrational properties of Picea jezoensis var. microsperma (Lindl.) W.C.Cheng & L.K.Fu

Single fiber swelling behavior for natural and man-made cellulose fibers under alkaline treatment

Contact Info

Product

Resources

About