Facile preparation of all-cellulose composites from softwood, hardwood, and agricultural straw cellulose by a simple route of partial dissolution

Tang, Xiaoning; Liu, Gaozhe; Zhang, Heng; Gao, Xin; Li, Meng; Zhang, Shumei

doi:10.1016/j.carbpol.2020.117591

Cited by 26 publications

(17 citation statements)

References 49 publications

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“…Differently, the diffraction curve of cellulose from welded area was showed to be classical characteristic of cellulose II with the main peaks at approximately 21.0° and 12.0°, respectively (Chen et al 2020;Zhang et al 2018). The diffraction cure of cellulose from the diffusion area was more complicated compared with the others, since its pattern was exhibited to be a transition state of crystalline form from I to II (Tang et al 2021).…”

Section: Resultsmentioning

confidence: 99%

“…Generally, it is known that the concentration of ZnCl 2 solvent used in cellulose dissolution is usually higher than 63% (w/w) (Fischer et al 2003;Schestakow et al 2016). Based on the authors' previous study, however, it was found that the initial concentration of zinc chloride solvent could be reduced to 45 % (w/w) (Zhang et al 2019;Tang et al 2021). It is indicative that the consumption of chemicals can be reduced almost 28.6% during the process of cellulose dissolution.…”

Section: Introductionmentioning

confidence: 98%

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Facile And Direct Adhesive of Cellulose Substrates Using Inorganic Metal Salt Through Partial Welding

Zhang

Liu

et al. 2021

Preprint

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In this study, we describe a method of cellulose substrates bonding through partial dissolution using low dosage of zinc chloride aqueous solvent as an adhesive. The results exhibited that the bonding area of strips was tough without any failure though the mechanical test, shrinks in solvent-diffusion area was the main reason that let to breakage. The study found that shrink phenomena in diffusion area can be avoided on a certain extent by the decrease in dosage of zinc chloride. Scanning electron microscopy and X-ray diffractometer revealed that the cellulose was partial dissolved and regenerated cellulose filled with the gaps between fibers, providing evidences of the macromolecular interlocking and entangling mechanism for combining strips. Additionally, X-ray photoelectron spectroscopy showed that a certain amount of zinc oxides was remained in the adhesive strips, demonstrating a difficulty of zinc ions to be completely removed due to their close combination with cellulose chains. This work provides an attractive attempt that partially dissolved cellulose was used as an adhesive, extending the application of cellulose welding and a new concept for bonding cellulose materials.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Facile And Direct Adhesive of Cellulose Substrates Using Inorganic Metal Salt Through Partial Welding

Zhang

Liu

et al. 2021

Preprint

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“…Two common methods of producing ACCs are infiltrating a cellulose solution in pre-aligned cellulose fibers [9][10][11], and in situ dissolution of cellulose fibrils to partially amorphized cellulose for binding remainder fibers [12][13][14]. Other routes for production of cellulose composites have been experimented through either incorporating fibers to cellulose solutions or partially dissolving fibers using solvents including N-methyl morpholine N-oxide (NMMO) [15], ionic liquids [16][17][18], N,N-dimethyl acetamide (DMAc) and LiCl [13,[19][20][21], or others [22,23], followed by coagulation to regenerate cellulose II, resulting in cellulose composites containing a myriad of structures resulting in interlinked bulk and interfacial properties [12,[23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Cellulose Nanocomposites of Cellulose Nanofibers and Molecular Coils

et al. 2021

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All-cellulose nanocomposites have been produced from cellulose nanofiber (CNF) suspensions and molecular coil solutions. Morphology and small-angle neutron scattering studies show the exfoliation and dispersion of CNFs in aqueous suspensions. Cellulose solutions in mixtures of ionic liquid and organic solvents were homogeneously mixed with CNF suspensions and subsequently dried to yield cellulose composites comprising CNF and amorphous cellulose over the entire composition range. Tensile tests show that stiffness and strength quantities of cellulose nanocomposites are the highest value at ca. 20% amorphous cellulose, while their fracture strain and toughness are the lowest. The inclusion of amorphous cellulose in cellulose nanocomposites alters their water uptake capacity, as measured in the ratio of the absorbed water to the cellulose mass, reducing from 37 for the neat CNF to less than 1 for a composite containing 35% or more amorphous cellulose. This study offers new insights into the design and production of all-cellulose nanocomposites.

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“…Cellulose is a polysaccharide that is composed of glucose monomers that are typically arranged in linear chains that are bound together via inter-and intramolecular hydrogen bonds (He et al 2020;Tang et al 2021). As mentioned above, cellulose is one of the most important wood biopolymers because of its presence being correlated with the strength of wood.…”

Section: Introductionmentioning

confidence: 99%

Direct measurement of surface adhesion between thin films of nanocellulose and urea–formaldehyde resin adhesives

Wibowo

Park

2021

Cellulose

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When applying an adhesive to wood, the chemical heterogeneity of the wood cell walls makes it difficult to understand the contribution they make to the interfacial adhesion between the adhesive and the wood as the adhesion is a very complex physical and chemical phenomenon.This study, for the first time, directly measured the surface adhesion between cellulose, a major component of wood, and urea-formaldehyde (UF) resin adhesives. The adhesion between thin, smooth nanocellulose films, such as cellulose nanofibrils (CNFs), carboxymethylated nanofibrils (CM)-CNFs, and carboxylated cellulose nanocrystals (C-CNCs), and UF resins with two formaldehyde to urea (F/U) molar ratios of 1.0 and 1.6 was measured using two approaches: 1) direct measurement of the adhesion force between nanocellulose films and liquid droplets of the UF resins, and 2) calculation of the work of adhesion between films of the nanocelluloses and UF resins using the contact angle and the van Oss-Chaudhury-Good (OCG) method. The results show that the total surface energies, either between the different nanocelluloses or between the two UF resins are somewhat similar, indicating the similarity in their surface properties.However, the adhesion force and work of adhesion of 1.6 UF resins with different types of nanocellulose are higher than those of 1.0 UF resins, which shows that van der Waals forces are dominant in their molecular interactions. These results suggest that the adhesion between 1.6 UF resins and nanocellulose is stronger than that when 1.0 UF resins are used because the 1.6 UF resins have a more branched structure, smoother surface, and higher surface energy.

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Facile preparation of all-cellulose composites from softwood, hardwood, and agricultural straw cellulose by a simple route of partial dissolution

Cited by 26 publications

References 49 publications

Facile And Direct Adhesive of Cellulose Substrates Using Inorganic Metal Salt Through Partial Welding

Facile And Direct Adhesive of Cellulose Substrates Using Inorganic Metal Salt Through Partial Welding

Cellulose Nanocomposites of Cellulose Nanofibers and Molecular Coils

Direct measurement of surface adhesion between thin films of nanocellulose and urea–formaldehyde resin adhesives

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