One‐Step Dispersion of Cellulose Nanofibers by Mechanochemical Esterification in an Organic Solvent

Huang, Pei; Wu, Min; Kuga, Shigenori; Wang, Deqian; Wu, Dayong; Huang, Yong

doi:10.1002/cssc.201200492

Cited by 93 publications

(85 citation statements)

References 53 publications

(10 reference statements)

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“…According to Huang et al, during hydrolysis with sulfuric acid, cellulose is susceptible to superficial esterification, with the replacement of hydroxyl by sulfate groups, creating an electrostatic repulsion caused by valence electrons. Negative charges present on the surface of the nanocrystals tend to increase the zeta potential in proportion to the hydrolysis time.…”

Section: Resultsmentioning

confidence: 99%

Morphological, barrier, and mechanical properties of cassava starch films reinforced with cellulose and starch nanoparticles

Santana

Costa

Rodrigues

et al. 2018

J of Applied Polymer Sci

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A comparative performance study of cellulose and starch nanoparticles on plasticized starch reinforcement has been presented. Starch nanoparticles were obtained by ultrasound and acid hydrolysis, and cellulose nanoparticles were extracted by acid hydrolysis from microcrystalline cellulose and sisal fibers. The nanoparticles were characterized according to the zeta potential, the particle‐size distribution, transmission electron microscopy, X‐ray diffraction, and thermogravimetric analysis. The influence of the addition of these nanoparticles to starch films on the morphology, water vapor permeability (WVP), and mechanical properties of the nanocomposites films were investigated. The cellulose nanoparticles exhibited higher electrical stability than those originating from starch. Acid hydrolysis produced starch nanoparticles with higher crystallinity than ultrasound. All the nanoparticles significantly reduced the WVP. The cellulose nanoparticles significantly increased the tensile strength of the starch films; however, they reduced the flexibility of the nanocomposites. The results of this work support the application of starch and cellulose nanostructures for the development of reinforced biodegradable materials. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47001.

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Section: Resultsmentioning

confidence: 99%

Morphological, barrier, and mechanical properties of cassava starch films reinforced with cellulose and starch nanoparticles

Santana

Costa

Rodrigues

et al. 2018

J of Applied Polymer Sci

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“…Bamboos are of notable economic and cultural significance in Asia. Therefore, based on the effect of mechanochemical activation [10] and the dissolving effect of phosphoric acid on cellulose, this study attempts to explore a low-cost approach and mild operating conditions to manufacture bamboo cellulose nanocrystals, in conjunction with ball milling [11] and ultrasonication in tandem mode, in which the dissolution and nanofibrils of cellulose take place simultaneously. Furthermore, the morphology, structure, spectroscopic, and thermal properties of the manufactured bamboo cellulose nanocrystals are also investigated.…”

Section: Introductionmentioning

confidence: 99%

A mechanochemical approach to manufacturing bamboo cellulose nanocrystals

Lin

Tang

et al. 2014

J Mater Sci

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Bamboo cellulose nanocrystals (BCNC) were manufactured via a mechanochemical approach with the dissolving action of phosphoric acid on cellulose. The effects of phosphoric acid concentration, reaction time, reaction temperature, and ultrasonication time on the yield of BCNC were investigated. Micromorphology and microstructure of BCNC were studied using scanning electron microscopy and transmission electron microscopy. Results showed that BCNC were short rod-like particles with 100-200 nm in length and 15-30 nm in width, forming an interconnected network structure. X-ray diffraction results indicated that the crystalline structure of BCNC transformed from cellulose I to cellulose II, compared to cellulose pulp, with the crystallinity index declining from 66.44 to 59.62 %. The thermal properties of BCNC were investigated by thermogravimetric analysis and revealed that BCNC exhibited lower thermal stability compared to cellulose pulp. This research work provides a low-cost approach and mild operating conditions to manufacturing BCNC.

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“…Cellulose nanocrystal (CNC) is a new kind of really renewable, environmentally friendly and superior material with light weight, excellent mechanical properties, good biodegradability and renewability [10,11]. Surface treatment technology is used to change the surface environment of cellulose by using a compound with a target group to react with the active groups on its surface [12,13,14,15,16,17]. For example, Sato et al [10] modified CNC by esterification with alkenyl succinic acid.…”

Section: Introductionmentioning

confidence: 99%

Novel Polyvinyl Alcohol (PVA)/Cellulose Nanocrystal (CNC) Supramolecular Composite Hydrogels: Preparation and Application as Soil Conditioners

2019

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In this work, cellulose nanocrystal (CNC) was modified by an ureido-pyrimidinone (UPy) system based on quadruple hydrogen bondings, and CNC-UPy was obtained. Then, this powder was added into polyvinyl alcohol (PVA), and PVA/CNC-UPy composite membranes and hydrogels were prepared. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), polarizing optical microscopy (POM) and particle size distribution (PSD) were used to characterize CNC-UPy. From the FTIR results, the characteristic peaks of NCO group sat 2270 cm−1 disappeared, indicating the successful synthesis of CNC-UPy. XRD results showed that the modification by UPy may change the structure of CNC and its degree of crystallinity was increased. PSD analysis showed that the particle size of CNC was increased and its size distribution became narrower after modification by UPy groups. The structure and properties of the composite membranes and hydrogels were studied by differential scanning calorimeter (DSC), thermogravimetric analysis (TGA) together with investigation of swelling, sustained release and self-healing performances. DSC curves depicted that the glass transition temperature, Tg, of different PVA membranes was increased with addition of different proportions of CNC-UPy. TGA data showed that the temperature of maximum weight loss rate was increased, which illustrated the enhanced thermal stability of PVA/CNC-UPy composites. Meanwhile, it was also revealed that the PVA/CNC-UPy composite hydrogels possess good self-healing and better sustained release behavior for the soil conditioner, fulvic acid (FA).

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One‐Step Dispersion of Cellulose Nanofibers by Mechanochemical Esterification in an Organic Solvent

Cited by 93 publications

References 53 publications

Morphological, barrier, and mechanical properties of cassava starch films reinforced with cellulose and starch nanoparticles

Morphological, barrier, and mechanical properties of cassava starch films reinforced with cellulose and starch nanoparticles

A mechanochemical approach to manufacturing bamboo cellulose nanocrystals

Novel Polyvinyl Alcohol (PVA)/Cellulose Nanocrystal (CNC) Supramolecular Composite Hydrogels: Preparation and Application as Soil Conditioners

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