Spraying Cellulose Nanofibrils for Improvement of Tensile and Barrier Properties of Writing &amp; Printing (W&amp;P) Paper

Mirmehdi, Seyedmohammad; Oliveira, Maria Luiza Cafalchio de; Hein, Paulo Ricardo Gherardi; Dias, Marali Vilela; Sarantópoulos, Claire Isabel Grígoli de Luca; Tonoli, Gustavo Henrique Denzin

doi:10.1080/02773813.2018.1432656

Cited by 25 publications

(12 citation statements)

References 53 publications

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“…As a result of the growing demand for sustainable, high-performance materials, significant advances has been made worldwide on the utilization of nanocellulose. Nanocellulose of various nature have been a research topic of interest for various applications such as paper coating, [1] rheological modifier, [2] packaging material with improved barrier properties, [3,4] emulsion stabilizer, [5] among others.…”

Section: Introductionmentioning

confidence: 99%

The effect of residual lignin on the rheological properties of cellulose nanofibril suspensions

Iglesias

Shivyari

Norris

et al. 2020

Journal of Wood Chemistry and Technology

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Although the removal of lignin and hemicelluloses from cellulose pulp to produce fully bleached cellulose nanofibrils (B-CNF) is the most common practice, the presence of residual lignin and hemicelluloses in raw materials for the production of lignin containing cellulose nanofibrils (LCNFs) holds several advantages. In this work, we investigated the effect of residual lignin in Eucalyptus globulus cellulose fibers on the properties of the resulting LCNFs. The stability of the colloidal suspensions was assessed by zeta-potential values and charge density analyses. Morphology of the CNFs was studied using scanning electron microscopy and atomic force microscopy. Fibril diameter and diameter distributions for CNFs with different levels of residual lignin showed a decrease on fiber diameter as the lignin content increases. Differences in the chemical composition of the CNFs was evidenced as indicated in the Fourier-transform infrared spectroscopy spectra, particularly in fingerprint region. Thermal behavior of the CNFs was not altered by the presence of lignin, as indicated by thermogravimetric analysis. Finally, the rheological behavior of the samples was evaluated observing a gel-like behavior as well as an increase of the viscosity in LCNFs with higher lignin contents.

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Section: Introductionmentioning

confidence: 99%

The effect of residual lignin on the rheological properties of cellulose nanofibril suspensions

Iglesias

Shivyari

Norris

et al. 2020

Journal of Wood Chemistry and Technology

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“…The difference in bulk density and the basis weight of the açai nanofibrils films was consistent with their morphologies. Increased density and basis weight of the films favors the mechanical and barrier strength of the films (Mirmehdi et al, 2018). After 5 and 20 cycles (comparable to the cycle number applied herein) in the grinder, films produced from pine kraft cellulose nanofibrils exhibited bulk densities of 1.09 g .…”

Section: Nanostructured Films Produced With Nanofibrils Obtained By 3 or 21 Grinding Cyclesmentioning

confidence: 68%

“…Their higher permeability is closely related to the lower nanofibrillation degree and, consequently, reduced interactions among hydrogen bonding in the net, which increased the voids and favored moisture transference across the films. Cellulose is a hydrophilic polymer with high water absorption capacity; however, when disintegrated to nanoscale particles followed by drying, it forms a very compact net of nanofibrils, which creates a tortoise path for water molecules increasing diffusion resistance (Mirmehdi et al, 2018).…”

Section: Nanostructured Films Produced With Nanofibrils Obtained By 3 or 21 Grinding Cyclesmentioning

confidence: 99%

Cellulose nanostructured films from pretreated açaí mesocarp fibers: physical, barrier, and tensile performance

Braga

Abreu

Silva

et al. 2021

CERNE

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Background: During de-pulping of açai (Euterpe oleracea) for juice production in the Amazonia, large amounts of fibrous waste are daily discarded, a promising substrate for production of high-value cellulose nanofibrils. Therefore, this study sought to evaluate the modifications of açai surface fibers submitted to chemical pretreatment steps and compare the quality of nanostructured films produced with different cycles of mechanical nanofibrillation. Results:A 2-hour pretreatment (at 5% of NaOH) followed by two NaOH/H 2 O 2 bleaching steps resulted in fibers with increased length and reduced diameter compared to raw fibers while preserving fiber integrity and cellulose I structure. The increase of fibers' grinding cycles from 3 (minimum to gel point) to 21 (maximum suspension thickness) resulted in nanofibril films with higher crystallinity properties, uniform thickness, compacted morphology, and smoother surface. Nanofibril films formed after different numbers of passages exhibited similar mechanical strength, but distinct barrier properties. Conclusion:Açaí waste films produced with fibers submitted to 3 grinding cycles can be recommended for packaging applications that demand easily dissolving, such as instantaneous food. Oppositely, açaí fibers subjected to 21 cycles in grinder provide films suitable for water-resistant packaging, ideal for secondary coatings of papers and paperboards.

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“…[ 35 ] It has also been shown that it is possible to obtain even coatings on different substrates by spraying NC which suggests that oriented LbL‐assemblies of NC are possible with this technique for any substrate. [ 36,37 ]…”

Section: Functional Materials Based On Lblmentioning

confidence: 99%

The Use of Layer‐by‐Layer Self‐Assembly and Nanocellulose to Prepare Advanced Functional Materials

2020

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The current knowledge about the formation of layer‐by‐layer (LbL) self‐assemblies using combinations of nanocelluloses (NCs) and polyelectrolytes is reviewed. Herein, the fundamentals behind the LbL formation, with a major focus on NCs, are considered. Following this, a special description of the limiting factors for the formation of LbLs of only NCs, both anionic and cationic, and the combination of NCs and polyelectrolytes/nanoparticles is provided. The ability of the NCs and polyelectrolytes to form dense films with excellent mechanical properties and with tailored optical properties is then reviewed. How low‐density, wet stable networks of cellulose nanofibrils can be used as substrates for the preparation of antibacterial, electrically interactive, and fire‐retardant materials by forming well‐defined LbLs inside these networks is then considered. A short outlook of the possible uses of LbLs containing NCs is given to conclude.

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Spraying Cellulose Nanofibrils for Improvement of Tensile and Barrier Properties of Writing & Printing (W&P) Paper

Cited by 25 publications

References 53 publications

The effect of residual lignin on the rheological properties of cellulose nanofibril suspensions

The effect of residual lignin on the rheological properties of cellulose nanofibril suspensions

Cellulose nanostructured films from pretreated açaí mesocarp fibers: physical, barrier, and tensile performance

The Use of Layer‐by‐Layer Self‐Assembly and Nanocellulose to Prepare Advanced Functional Materials

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