Highly tough and transparent layered composites of nanocellulose and synthetic silicate

Wu, Changming; Yang, Quanling; Takeuchi, Miyuki; Saito, Tsuguyuki; Isogai, Akira

doi:10.1039/c3nr04102f

Cited by 70 publications

(58 citation statements)

References 35 publications

(56 reference statements)

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“…A similar explanation is used for the nano-reinforcement effect of nanoclay/TOCN composite films (Wu et al 2012(Wu et al , 2014, and therefore these effects are characteristic of TOCNs, which form self-aligned and nematic-ordered domain structures in aqueous dispersions. A schematic diagram of the mechanism of the improvement of the tensile properties of PAM/ TOCN = 25/75 composite films is shown in Fig.…”

Section: Mechanism Of Improvement Of Tensile Properties Of Pam/tocn Cmentioning

confidence: 87%

“…If TOCNs can be replaced by an inexpensive conventional polymer, while giving mechanical, optical, oxygen-barrier, and thermal properties similar to those of 100 % TOCNs, less expensive materials for use in various high-tech fields could be produced. Because TOCN is nanodispersible in water, it is advantageous for TOCNs to contain water-soluble polymers or water-nanodispersible nanoclays to achieve homogeneous distribution of TOCN elements in matrix polymers or inorganic nanoparticles (Henriksson et al 2008;Johnson et al 2009;Sehaqui et al 2010Sehaqui et al , 2011Liu et al 2011;Endo et al 2013;Wu et al 2012Wu et al , 2014.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of TEMPO-oxidized cellulose nanofibril film reinforcement with poly(acrylamide)

Kurihara

Isogai

2015

Cellulose

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2,2,6,6-Tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibrils (TOCNs) and poly(acrylamide) (PAM) with sodium carboxylate groups (TOCN-COONa and PAM-COONa, respectively) were converted to TOCN and PAM with protonated carboxyl groups (TOCN-COOH and PAM-COOH, respectively). Transparent and flexible PAM-COOH/TOCN-COOH, PAM-COONa/TOCN-COOH, and PAM-COOH/TOCN-COONa composite films were prepared by mixing aqueous PAM-COOH or PA M-COONa solutions and aqueous TOCN-COOH or TOCN-COONa dispersions with various PAM/TOCN weight ratios, and successive casting/drying of the mixtures. In all cases, the Young's modulus and tensile strength of the composite film were highest when the PAM content of the composite film was in the range 10-25 %. PAM therefore has the potential to reinforce TOCN films, irrespective of the sodium carboxylate groups or protonated carboxyl groups of TOCN or PAM. Although the FT-IR spectra of the PAM-COOH/TOCN-COOH composite films with various PAM/TOCN weight ratios indicated the formation of hydrogen bonds between PAM-COOH and TOCN-COOH, the formation of these hydrogen bonds could not explain the reinforcing effect achieved by PAM addition to TOCN-COOH. Because the TOCN elements form nematic-ordered or selfaligned domain structures in aqueous dispersions, PAM molecules at the corresponding PAM contents are probably present around the boundary regions of TOCN domains, and fill or cover the defects present between the TOCN domains.

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Section: Mechanism Of Improvement Of Tensile Properties Of Pam/tocn Cmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Mechanism of TEMPO-oxidized cellulose nanofibril film reinforcement with poly(acrylamide)

Kurihara

Isogai

2015

Cellulose

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“…Hybrid films of MTM or saponite and carboxylated cellulose nanofibril displayed, e.g., a tensile stress of around 400 MPa but only a 4.3% strain to failure at a 50 wt% nanoclay content. [11a] CNF does not absorb light in the visible range and CNF‐based hybrid films with a high transparency have been obtained by using 50 nm saponite particles …”

Section: Introductionmentioning

confidence: 99%

Transparent and Flexible Nacre‐Like Hybrid Films of Aminoclays and Carboxylated Cellulose Nanofibrils

Liu

Bergström

2017

Adv Funct Materials

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Nacre and other biological composites are important inspirations for the design and fabrication of multifunctional composite materials. Transparent, strong, and flexible hybrid films of aminoclays (AC) and carboxylated cellulose nanofibrils (CNF) with a nacre-like microstructure at AC contents up to 60 wt% are prepared. The high transmittance of visible light is attributed to the high homogeneity of the hybrid films and to the relatively small refractive index contrast between the CNF-based matrix and synthetic AC. The strength and strain to failure of the hybrids are significantly higher than biogenic nacre and other nacre-mimicking nanocellulose-based materials, e.g., montmorillonite-CNF and graphene oxide-CNF composite films. The excellent mechanical properties are related to the ionic bonds between the negatively charged carboxylic groups on the CNF and the positively charged amine groups on the AC nanoparticles. This work illustrates the significance of tailoring the interactions between small clay particles and biopolymers in multifunctional materials with potential applications as printable barrier coatings and substrates for optoelectronics.

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“…where the true density of 1.6 g/cm 3 was used for wood TOCNs (Daicho et al, 2018). The surface roughness values of the films were measured for the film/air interface side, which formed during the film preparation process, from the atomic force microscopy (AFM) images (Wu et al, 2014). The light transmittance values of the sheet and films were measured with the V-670 UV-vis spectrophotometer and normalized to 50 µm thickness according to the Lambert-Beer law.…”

Section: Characterization Of the Sheet And Filmsmentioning

confidence: 99%

Nanocellulose Film Properties Tunable by Controlling Degree of Fibrillation of TEMPO-Oxidized Cellulose

et al. 2020

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A fibrous 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized wood cellulose/water slurry was disintegrated with a magnetic stirrer or high-pressure homogenizer under various conditions to prepare TEMPO-oxidized cellulose (TOC)/water dispersions with different degrees of fibrillation. The turbidity value of the as-prepared dispersion was used as a measure of the degree of nanofibrillation of the fibrous TOC slurry in water. The fibrillated TOC/water dispersions with low degrees of fibrillation had cellulose nanonetwork (CNNeW) structures consisting of TOC nanofibrils (TOCNs), unfibrillated TOC fibers, and fibril bundles. The original TOC/water slurry and partly fibrillated TOC/water dispersions with low degrees of fibrillation were converted to a sheet and films, respectively, in a short time by membrane filtration, and they had low bulk densities and high porosities. Membrane filtration of an almost completely nanofibrillated TOC/water or TOCN dispersion took a long time, but the as-prepared TOCN films had the highest light transparency, tensile strength, Young's modulus, and work of fracture. The oxygen permeabilities of the films at 23 • C and 50% relative humidity were as low as 1-2 ml µm m −2 day −1 kPa −1 among the films prepared from the fibrillated TOC/water dispersions with a wide turbidity range of 0.01-0.45. Therefore, TEMPO-oxidized CNNeW films with the versatile optical, porous, and mechanical properties but similarly low oxygen permeabilities can be prepared by controlling the degree of fibrillation of the TOC/water slurry (Graphical Abstract).

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Highly tough and transparent layered composites of nanocellulose and synthetic silicate

Cited by 70 publications

References 35 publications

Mechanism of TEMPO-oxidized cellulose nanofibril film reinforcement with poly(acrylamide)

Mechanism of TEMPO-oxidized cellulose nanofibril film reinforcement with poly(acrylamide)

Transparent and Flexible Nacre‐Like Hybrid Films of Aminoclays and Carboxylated Cellulose Nanofibrils

Nanocellulose Film Properties Tunable by Controlling Degree of Fibrillation of TEMPO-Oxidized Cellulose

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