Low-energy preparation of cellulose nanofibers from sugarcane bagasse by modulating the surface charge density

Pinto, Lidiane O.; Bernardes, Juliana S.; Rezende, Camila A.

doi:10.1016/j.carbpol.2019.04.070

Cited by 58 publications

(52 citation statements)

References 51 publications

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“…The SIE here is defined as the ratio of Br sites initiated by SI‐ATRP into polymer chains, to the total Br content at the surface of CNC 158 . Just like the initiator efficiency in the homogeneous ATRP, the SIE of SI‐ATRP can be affected by many parameters, such as the density of initiating sites, the concentration of catalyst, the catalyst/deactivator ratio, and the number of monomers added per activation cycles 104,130,172 . Zhang et al reported a SIE of 38% in polystyrene grafted CNC (PS‐g‐CNC), based on the Br content in BrCNC, and the weight percentage of PS cleaved from PS‐g‐CNC 165 .…”

Section: The Precise Control Of Grafted Polymers From Cnc Via Si‐atrpmentioning

confidence: 99%

“…158 Just like the initiator efficiency in the homogeneous ATRP, the SIE of SI-ATRP can be affected by many parameters, such as the density of initiating sites, the concentration of catalyst, the catalyst/deactivator ratio, and the number of monomers added per activation cycles. 104,130,172 Zhang et al reported a SIE of 38% in polystyrene grafted CNC (PS-g-CNC), based on the Br content in Br CNC, and the weight percentage of PS cleaved from PS-g-CNC. 165 The low SIE reported in this case may be related to the inaccuracy of the oxygen flask method to measure the Br content, and/or incomplete cleavage of the PS chains, and/or PS loss during the tedious cleaving and recovery procedures.…”

Section: Polymer Grafting Densitymentioning

confidence: 99%

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Grafting polymers from cellulose nanocrystals via surface‐initiated atom transfer radical polymerization

Zhang

Sèbe

Hou

et al. 2021

J of Applied Polymer Sci

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Cellulose nanocrystals (CNC) are rod‐like nanoparticles extracted from cellulose. Due to their fascinating properties—renewable, biocompatible, non‐toxic, biodegradable, excellent mechanical performances, high specific surface area, water dispersible, can be assemble in chiral nematic phases—CNC have shown promise in various fields, including oil recovery, polymer composites reinforcing, hydrogels, aerogels, supercapacitors, energy saving buildings, cosmetics, papermaking, coatings, liquid crystals, and waste water treatment. However, the hydrophilic surface of CNC hinders their broader applications. In this context, surface modification of CNC via polymer grafting can be used to finely tune their surficial properties and endow CNC with a variety of functionalities, such as conductivity, pH or temperature responsiveness, reactivity…In particular, surface‐initiated atom transfer radical polymerization (SI‐ATRP) is a powerful tool to graft various polymers with a high grafting density and controlled chain length. In this review, the precise control of grafted polymers from CNC via SI‐ATRP is first discussed, including issues related to the polymer grafting density, chain length and possibility to perform an asymmetric grafting. Then, the properties and applications of CNC grafted with a variety of polymers are presented. Finally, some challenges and outlook related to the SI‐ATRP method applied to the field of CNC is discussed.

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Section: The Precise Control Of Grafted Polymers From Cnc Via Si‐atrpmentioning

confidence: 99%

Section: Polymer Grafting Densitymentioning

confidence: 99%

Grafting polymers from cellulose nanocrystals via surface‐initiated atom transfer radical polymerization

Zhang

Sèbe

Hou

et al. 2021

J of Applied Polymer Sci

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“…78 Sugarcane is crushed to extract its juice in sugar mills and one third of the sugarcane's mass is left as a residue, bagasse. 79 Currently 9% of the bagasse is used in ethanol production, 6% is discarded and 85 % is burnt as fuel in sugar mills even though bagasse has low caloric power and burning it produces air pollution due to the quality of smoke released in the atmosphere. 80 Furthermore, dry bagasse is generally composed of around 45% of cellulose, 26% of hemicellulose and 24% of lignin, which combined with availability makes it an appealing source for cellulose fibres.…”

Section: Sugarcane Bagassementioning

confidence: 99%

Micro- and nanocelluloses from non-wood waste sources; processes and use in industrial applications

2021

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“…Higher treatment intensity and exposure time increase the degree of fibrillation and benefit the development of the cellulose fibers to smaller sizes. 24 , 29 However, also the fibril length and cellulose crystallinity (i.e., the regions of the structured organization of the glucose polymer and its constituting glucose monomer) are decreasing, which is often regarded as quality degradation. 9 , 30 , 31 Cavitation, especially acoustic cavitation, is also employed to intensify chemical modification.…”

Section: Introductionmentioning

confidence: 99%

Cavitation Fibrillation of Cellulose Fiber

et al. 2022

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Cellulose fibrils are the structural backbone of plants and, if carefully liberated from biomass, a promising building block for a bio-based society. The mechanism of the mechanical release—fibrillation—is not yet understood, which hinders efficient production with the required reliable quality. One promising process for fine fibrillation and total fibrillation of cellulose is cavitation. In this study, we investigate the cavitation treatment of dissolving, enzymatically pretreated, and derivatized (TEMPO oxidized and carboxymethylated) cellulose fiber pulp by hydrodynamic and acoustic (i.e., sonication) cavitation. The derivatized fibers exhibited significant damage from the cavitation treatment, and sonication efficiently fibrillated the fibers into nanocellulose with an elementary fibril thickness. The breakage of cellulose fibers and fibrils depends on the number of cavitation treatment events. In assessing the damage to the fiber, we presume that microstreaming in the vicinity of imploding cavities breaks the fiber into fibrils, most likely by bending. A simple model showed the correlation between the fibrillation of the carboxymethylated cellulose (CMCe) fibers, the sonication power and time, and the relative size of the active zone below the sonication horn.

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Low-energy preparation of cellulose nanofibers from sugarcane bagasse by modulating the surface charge density

Cited by 58 publications

References 51 publications

Grafting polymers from cellulose nanocrystals via surface‐initiated atom transfer radical polymerization

Grafting polymers from cellulose nanocrystals via surface‐initiated atom transfer radical polymerization

Micro- and nanocelluloses from non-wood waste sources; processes and use in industrial applications

Cavitation Fibrillation of Cellulose Fiber

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