Amelioration of Physical Properties and Printability of Paper Coated with N-methylated Chitosan

Wu, Meiyan; Xu, Rui; Liu, Chao; Li, Bin; Long, Zhu

doi:10.1038/s41598-020-66827-8

Cited by 10 publications

(7 citation statements)

References 55 publications

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“…Interestingly, the strength properties of papers coated of paraffin and beeswax dispersions are on a similar level, despite significant differences in viscosity of the coating mixtures. This is a very interesting observation compared to the results obtained by other researchers [ 55 ]. In theory, with highly viscous mixtures, it is harder to form a uniform coating, while for mixtures with low viscosity, it is easier to get a flat and uniform coating, leading to a better warp-resistance and increased strength of the paper sheet after the coating.…”

Section: Discussionsupporting

confidence: 82%

Barrier Dispersion-Based Coatings Containing Natural and Paraffin Waxes

et al. 2022

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Petroleum, synthetic, and natural waxes have been used as hydrophobic bases for dispersions intended for use as barrier coatings for packaging paper. Oil-in-water dispersions with alkaline pH were prepared by a two-step homogenization procedure containing paraffin wax, with various characteristics, the Fischer–Tropsch synthesis product or beeswax. The size of the dispersed particles determined by dynamic light scattering depended on the type of hydrophobic base used and was in the range of 350–440 nm. The ability of dispersion particles in aggregation driven by electrostatic attraction, evaluated by Zeta potential analysis by electrophoretic light scattering, was from −26 to −50 mV. Static multiply light scattering was used for 30 days of stability assessment and helped to select the dispersion with a Sarawax SX70 wax base as the most stable. Dispersions were further used for coating the backing of kraft paper by the Meyer rod method. Coated paper with an applied coating of 6 g/m2 had very good hydrophobic properties (Cobb60 < 4 g/m2), sufficient strength properties, and air permeation, which enabled its application as a packaging material. The dispersions based on Sarawax SX70 wax were evaluated as the best coating for Mondi ProVantage Kraftliner 125 g/m2 backing paper. Good hydrophobic properties and strength properties indicate the possibility of using the SX70-based wax dispersion coating as a replacement for PFAS coatings in some applications.

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Section: Discussionsupporting

confidence: 82%

Barrier Dispersion-Based Coatings Containing Natural and Paraffin Waxes

et al. 2022

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“…The resulting surface is observed in the SEM images: a flat and smooth surface [40]. The cellulose is covered with the PVA, resulting in a coated paper with large holes between the fibers [41]. The low porosity limits the ink penetration causing bad adhesion.…”

Section: Type Of Papermentioning

confidence: 99%

Fabrication of Low‐cost Screen‐printed Electrode in Paper Using Conductive Inks of Graphite and Silver/Silver Chloride

2022

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The fabrication of the Screen‐Printed Electrode (SPE) was performed using the graphite ink to print the working (WE) and counter electrodes (CE), and silver/silver chloride path as reference electrode (RE). All the electrodes are printed in a paper substrate using screen‐printing technique. The resulting SPE is characterized using scanning electron microscopy, showing all the ink layer, and subsequently optimized. The paper sample presented the cellulose fibers entanglement, extremely rough, with highly porous network. Then the graphite ink was deposited and the surface became flat, thinner and very smooth. When the silver ink was painted on top of the graphite ink, the spherical silver particles, ranged from 2–3.5 μm in size, were observed. And finally, the silver ink was covered with a AgCl layer and the particle size becomes larger with an irregular sphere‐like phase. The images showed that the layers appear to be homogeneously distributed with good coverage. Then fabrication process was optimized concerning type of paper, the sanding process, the hydrophobic barrier, the electrode design and size. In summary, the optimized values included using the previously sanded matte paper with a mineral spirit layer. The design and size of the electrode were also tested to achieve the best electrochemical performance (design 3 with 3.5 cm). The final SPE was a miniaturized and flexible paper‐based electrochemical electrode. In order to evaluate the electrical properties, the ohmic resistance of each ink was tested using a multimeter and the obtained values were 2.18 kΩ for the graphite ink, 2.27 Ω for the silver ink and 38.33 kΩ for the silver/silver chloride ink. That can indicate the good conductivity of each ink used in the fabrication of the electrode and the correct deposition of Ag/AgCl. Finally, the electrode was used to measure the electrochemical response of K4[Fe(CN)6] in different concentrations. Then a calibration curve was obtained from the voltammograms and a linearity was observed between the current and concentration in the range of 0.50–2.00 mM. That indicates that the SPE has potential to be used as a voltammetric electrode.

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“…Recent studies on chitosan as a coating have focused on the development of composite coatings or multilayer coatings on the paper surface to combine the good mechanical resistance of the paper material with the barrier properties of coating materials [7][8][9][10][11]. The improvement of the barrier and mechanical properties of the paper by the addition of chitosan was confirmed by the fact that the pores of the paper are filled with chitosan [12][13][14]. This had an impact on reducing water vapor permeability, as well as improving stiffness, strength and toughness [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Chitosan-Coated Packaging Papers—Strength and Thermal Stability

et al. 2023

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The aging of paper depends on various factors, including environmental conditions, microbiological factors and chemical composition. Chitosan-coated paper is an eco-friendly material that has potential use in various packaging applications due to its mechanical, barrier and antibacterial properties. In this study, the aging stability of chitosan-coated wood-free wrapping paper was evaluated by examining pulp and four paper samples with different quantities of chitosan. Accelerated thermal aging and dynamic thermogravimetric analysis were used to assess the aging stability, while color changes were examined to understand the impact of chitosan coating. The study found that increasing chitosan coating led to improved aging stability due to the improved crosslinking process between chitosan and paper. The coated paper samples displayed a yellowish hue after 72 h of aging, with increased strength and resistance to weight loss. TGA results indicated that the temperature of complete burning of the sample increased with increasing chitosan coating. Additionally, coated paper samples exhibited a more even surface and improved barrier properties. Overall, chitosan-coated paper is a promising material for sustainable and eco-friendly packaging, printing and wrapping applications. This study’s findings have important implications for the development of environmentally-friendly packaging materials that possess desirable mechanical and barrier properties.

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Amelioration of Physical Properties and Printability of Paper Coated with N-methylated Chitosan

Cited by 10 publications

References 55 publications

Barrier Dispersion-Based Coatings Containing Natural and Paraffin Waxes

Barrier Dispersion-Based Coatings Containing Natural and Paraffin Waxes

Fabrication of Low‐cost Screen‐printed Electrode in Paper Using Conductive Inks of Graphite and Silver/Silver Chloride

Chitosan-Coated Packaging Papers—Strength and Thermal Stability

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