Surface modification of cotton nanocrystals with a silane agent

Taipina, Márcia de Oliveira; Ferrarezi, Márcia Maria Favaro; Yoshida, Inez Valéria Pagotto; Gonçalves, Maria do Carmo

doi:10.1007/s10570-012-9820-3

Cited by 106 publications

(43 citation statements)

References 35 publications

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“…7-11 Covalent modifications of CNCs generally include esterification (mostly acetylation, butyration, and palmitoylation), urethanization (also known as carbanylation), amidation, and silylation with contact angles reported in the range of 67 to 85°, but generally lying on the lower end of these values. [12][13][14][15][16][17][18][19][20] Furthermore, most of these modifications are carried out in organic solvents.…”

Section: Introductionmentioning

confidence: 99%

One-Pot Water-Based Hydrophobic Surface Modification of Cellulose Nanocrystals Using Plant Polyphenols

Berry

Pelton

et al. 2017

ACS Sustainable Chem. Eng.

195

158

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An environmentally friendly procedure for the surface modification of cellulose nanocrystals (CNCs) in water is presented. Tannic acid (TA), a plant polyphenol, acts as the primer when mixed with CNCs in suspension, which are then reacted with decylamine (DA), the hydrophobe. Schiff base formation/Michael-type addition covalently attaches primary amines with long alkyl tails to CNC-TA, increasing the particle hydrophobicity (contact angle shift from 21° to 74°). After modification, the CNC-TA-DA particles in water phase separate, allowing for easy collection of modified material. The dried product is readily redispersible in toluene and other organic solvents, as demonstrated by turbidity measurements, dynamic light scattering, optical microscopy and liquid crystal self-assembly behavior. Electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, solid-state 13 C NMR, and X-ray diffraction support the successful surface modification and indicate that CNC particle morphology is retained. The modified CNCs have a slightly decreased onset of thermal degradation (ca. 10 °C lower) compared with unmodified CNCs. We believe that this surface modification strategy presents a scalable, simple and green approach to the production of hydrophobic bio-based nanoparticles which may lend themselves as reinforcing agents in nonpolar polymer composites, or stabilizers and rheological modifiers in non-aqueous liquid formulated products.

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Section: Introductionmentioning

confidence: 99%

One-Pot Water-Based Hydrophobic Surface Modification of Cellulose Nanocrystals Using Plant Polyphenols

Berry

Pelton

et al. 2017

ACS Sustainable Chem. Eng.

195

158

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“…The typical method for the preparation of CNCs is inorganic strong acid hydrolysis, including sulphuric (Habibi 2014;Tang et al 2013), hydrochloric (de Oliveira et al 2012), nitric (Cao et al 2015), phosphoric acids (Camarero Espinosa et al 2013;Tang et al 2015) or their mixtures hydrolysis (Li et al 2013d). In the process of acid hydrolysis, the amorphous fraction of cellulose was dissolved and rod shaped crystallites were obtained (Eyholzer et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of thermally stable cellulose nanocrystals via a sustainable approach of FeCl3-catalyzed formic acid hydrolysis

Liu

et al. 2016

Cellulose

150

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Cellulose nanocrystals (CNCs) can be used as building blocks for the production of many renewable and sustainable nanomaterials. In this work, CNCs were produced from bleached eucalyptus kraft pulp with a high yield over 75 % via FeCl 3 -catalyzed formic acid (FA) hydrolysis process. It was found that the particle size of resultant CNC products (F-CNC) decreased with the increase of FeCl 3 dosage in FA hydrolysis, and a maximum crystallinity index of about 75 % could be achieved when the dose of FeCl 3 was 0.015 M (i.e. about 7 % based on the weight of starting material). Thermogravimetric analyses revealed that F-CNC exhibited a much higher thermal stability (the decomposition temperature was over 260°C) than S-CNC prepared by typical sulfuric acid hydrolysis. In the FeCl 3 -catalyzed FA hydrolysis process, FA could be easily recovered and reused, and FeCl 3 could be transferred to Fe(OH) 3 as a high value-added product. Thus, the FeCl 3 -catalyzed FA hydrolysis process could be sustainable and economically feasible. In addition, F-CNC could be well dispersed in DMSO and its dispersibility in water could be improved by a cationic surface modification.

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“…Both MCC and MAM-g-MCC exhibited typical diffraction peaks at 2 values of approximately 16°, 22.6°, and 34.6°, and these peaks were assigned to the typical (1 1 0), (110), and (200) planes of cellulose Iβ, respectively (Klemm et al 2005;de Oliveira Taipina et al 2013), suggesting that there was no regeneration of crystallinity during the process of grafting MAM onto MCC. The double peak at around 16° indicated that MCC had high cellulose content, and the merging of the two peaks around the 16° region was caused by non-cellulose components (Martins et al 2011;Hossain et al 2012;de Oliveira Taipina et al 2013). Furthermore, …”

Section: Characterization Of the Grafted MCC With Mammentioning

confidence: 99%

“…Cellulose, one of the most abundant natural materials, has garnered attention in recent decades because of its renewability, biodegradable characteristics, and availability from a variety of sources (de Oliveira Taipina et al 2013). Cellulose is a branched linear polymer with numerous hydrogen bonds.…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Modification of Microcrystalline Cellulose by Grafting Copolymerization

Liu

et al. 2015

BioRes

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Microcrystalline cellulose (MCC) has the advantage of a high specific surface area as compared to that of conventional cellulose fibers. In this study the monomer methacrylamide (MAM) was used to treat MCC by grafting copolymerization. SEM, FTIR, and solid 13 C NMR were used to characterize the morphology and composition of MAM-g-MCC. After the chlorination of MAM-g-MCC with 10% sodium hypochlorite solution, the grafted MCC exhibited antibacterial activity as a result of the formation of N-Cl bonds. The thermal stability, antibacterial ability, and storage stability of chlorinated MAM-g-MCC were also studied. The results showed that the chlorinated MAM-g-MCC had excellent storage stability and could inactivate all S. aureus and E. coli O157:H7 within 10 min.

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Surface modification of cotton nanocrystals with a silane agent

Cited by 106 publications

References 35 publications

One-Pot Water-Based Hydrophobic Surface Modification of Cellulose Nanocrystals Using Plant Polyphenols

One-Pot Water-Based Hydrophobic Surface Modification of Cellulose Nanocrystals Using Plant Polyphenols

Preparation and characterization of thermally stable cellulose nanocrystals via a sustainable approach of FeCl3-catalyzed formic acid hydrolysis

Antibacterial Modification of Microcrystalline Cellulose by Grafting Copolymerization

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