Influence of TEMPO oxidation on the properties of ethylene glycol methyl ether acrylate grafted cellulose sponges

Chiulan, Ioana; Panaitescu, Denis Mihaela; Radu, Elena; Vizireanu, Sorin; Sătulu, Vera; Biţă, Bogdan; Gabor, Raluca Augusta; Nicolae, Cristian Andi; Raduly, Florentina Monica; Rădiţoiu, Valentin

doi:10.1016/j.carbpol.2021.118458

Cited by 20 publications

(14 citation statements)

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“…The conditions of the synthesis have been described previously [ 15 ]. Briefly, 200 g of CNF suspension (0.065 mol/L) and 0.03 g KPS were added to a 250 mL three-necked round-bottom flask and stirred for 10 min under a nitrogen atmosphere.…”

Section: Methodsmentioning

confidence: 99%

“…In particular, the grafting of poly(ethylene oxide) moieties onto cellulose has been reported for different applications in thermal energy storage [ 10 ], for the development of gel polymer electrolyte [ 11 ], to prepare biosensors [ 12 ] and more flexible composites for packaging [ 13 ] or drug delivery systems [ 14 ]. In our earlier report, we identified and characterized 2,6,6-tetra-methylpiperidine-1-oxyl (TEMPO) oxidized cellulose nanofiber (TOCNF) as an efficient substrate to graft ethylene glycol methyl ether acrylate [ 15 ]. This chemical treatment has been proven to facilitate the grafting of acrylate oligomers on the surface of TOCNF compared with the original CNF, resulting in improved properties.…”

Section: Introductionmentioning

confidence: 99%

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Sponges from Plasma Treated Cellulose Nanofibers Grafted with Poly(ethylene glycol)methyl Ether Methacrylate

et al. 2022

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In this work, cellulose nanofibers (CNF) were surface treated by plasma and grafted with poly(ethylene glycol)methyl ether methacrylate (PEGMMA) for increasing mechanical strength and hydrophobicity. The surface characteristics of the sponges were studied by scanning electron microscopy, micro-computed tomography, and Fourier transform infrared spectroscopy, which demonstrated successful surface modification. Plasma treatment applied to CNF suspension led to advanced defibrillation, and the resulting sponges (CNFpl) exhibited smaller wall thickness than CNF. The grafting of PEGMMA led to an increase in the wall thickness of the sponges and the number of larger pores when compared with the non-grafted counterparts. Sponges with increased hydrophobicity demonstrated by an almost 4 times increase in the water contact angle and better mechanical strength proved by 2.5 times increase in specific compression strength were obtained after PEGMMA grafting of plasma treated CNF. Cells cultivated on both neat and PEGMMA-grafted CNF sponges showed high viability (>99%). Remarkably, CNF grafted with PEGMMA showed better cell viability as compared with the untreated CNF sample; this difference is statistically significant (p < 0.05). In addition, the obtained sponges do not trigger an inflammatory response in macrophages, with TNF-α secretion by cells in contact with CNFpl, CNF-PEGMMA, and CNFpl-PEGMMA samples being lower than that observed for the CNF sample. All these results support the great potential of cellulose nanofibers surface treated by plasma and grafted with PEGMMA for biomedical applications.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sponges from Plasma Treated Cellulose Nanofibers Grafted with Poly(ethylene glycol)methyl Ether Methacrylate

et al. 2022

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“…This effect can be attributed to TEMPO‐oxidized cellulose containing negatively charged carboxyl groups (–COO − ) that tend to electrostatically repel each other, thereby causing the polysaccharide chains to move away from each other 10,33 . As a result, the TEMPO‐oxidized cellulose molecules tend to adsorb water and swell more rapidly 34 . In addition, the composite hydrogels had faster swelling rates and final swelling ratios than the cellulose‐only hydrogels: TEMPO‐CA > TEMPO‐AG > TEMPO‐CH > TEMPO > Non‐treated.…”

Section: Resultsmentioning

confidence: 99%

“…10,33 As a result, the TEMPO-oxidized cellulose molecules tend to adsorb water and swell more rapidly. 34 In addition, the composite hydrogels had faster swelling rates and final swelling ratios than the cellulose-only hydrogels: TEMPO-CA > TEMPO-AG > TEMPO-CH > TEMPO > Non-treated. Presumably, water molecules could diffuse into the hydrogels containing CA, AG and CH more rapidly because they are hydrophilic molecules and because their presence led to a more open structure.…”

Section: Equilibrium Swelling Analysis Of Composite Hydrogelsmentioning

confidence: 94%

The measurement of molecular interactions, structure and physical properties of okara cellulose composite hydrogels using different analytical methods

McClements

et al. 2022

J Sci Food Agric

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BACKGROUND Aiming to address the practical problems of a low utilization rate and the serious waste of soybean residue, novel composite hydrogels based on okara cellulose before and after 2,2,6,6‐tetramethylpiperidine oxide (TEMPO) oxidation and high polymers of chitosan (CH), carrageenan (CA) or Arabic gum (AG) were prepared by a homogeneous mixture in ionic liquid. RESULTS In the present study, composite hydrogels fabricated from okara cellulose and CH, CA or AG were prepared by dissolving them in an ionic liquid, followed by heating (100 °C, 3 h) and then soaking them in a 1:1 water–isopropanol solution. The composite hydrogels prepared from TEMPO oxidation‐treated cellulose were physically cross‐linked to CH, CA or AG. The results showed that the intramolecular hydrogen bonds in the amorphous regions of the cellulose were disrupted, whereas the intermolecular hydrogen bonds between the biopolymers were increased, which promoted the formation of composite gels with crystalline structures. The TEMPO treatment increased the gel strength. For example, for the cellulose/CA gels, the hardness, fracturability, springiness and cohesiveness values were 5.9‐, 4.3‐, 2.4‐ and 3.6‐fold higher compared to the non‐treated ones, respectively. The composite hydrogels exhibited good thermal stability, swelling properties and mechanical properties. These novel composite polysaccharide‐based hydrogels may therefore have great potential in various food and non‐food fields. CONCLUSION In summary, the addition of polymers (CH, CA or AG) and TEMPO oxidized cellulose was suitable for increasing the swelling, textural properties, thermal stability and rheological properties of hydrogels, which provides new ideas and new methods for the preparation of bio‐based composite hydrogels. © 2022 Society of Chemical Industry.

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“… Different preparation methods of nanocellulose ( a ) inorganic acid hydrolysis, reprinted with permission from [ 98 ], 2022, Elsevier; ( b ) organic acid hydrolysis, reprinted with permission from [ 99 ], 2021, Elsevier; ( c ) mechanical treatment, reprinted with permission from [ 71 ], 2022, Elsevier and [ 100 ], 2021, Elsevier; ( d ) microbial synthesis, reprinted with permission from [ 101 ], 2022, Elsevier and [ 37 ], 2019, Frontiers Media S.A. …”

Section: Preparation and Characteristics Of Nanocellulosementioning

confidence: 99%

Emerging Food Packaging Applications of Cellulose Nanocomposites: A Review

Zhang

Zhong

et al. 2022

Polymers

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Cellulose is the most abundant biopolymer on Earth, which is synthesized by plants, bacteria, and animals, with source-dependent properties. Cellulose containing β-1,4-linked D-glucoses further assembles into hierarchical structures in microfibrils, which can be processed to nanocellulose with length or width in the nanoscale after a variety of pretreatments including enzymatic hydrolysis, TEMPO-oxidation, and carboxymethylation. Nanocellulose can be mainly categorized into cellulose nanocrystal (CNC) produced by acid hydrolysis, cellulose nanofibrils (CNF) prepared by refining, homogenization, microfluidization, sonification, ball milling, and the aqueous counter collision (ACC) method, and bacterial cellulose (BC) biosynthesized by the Acetobacter species. Due to nontoxicity, good biodegradability and biocompatibility, high aspect ratio, low thermal expansion coefficient, excellent mechanical strength, and unique optical properties, nanocellulose is utilized to develop various cellulose nanocomposites through solution casting, Layer-by-Layer (LBL) assembly, extrusion, coating, gel-forming, spray drying, electrostatic spinning, adsorption, nanoemulsion, and other techniques, and has been widely used as food packaging material with excellent barrier and mechanical properties, antibacterial activity, and stimuli-responsive performance to improve the food quality and shelf life. Under the driving force of the increasing green food packaging market, nanocellulose production has gradually developed from lab-scale to pilot- or even industrial-scale, mainly in Europe, Africa, and Asia, though developing cost-effective preparation techniques and precisely tuning the physicochemical properties are key to the commercialization. We expect this review to summarise the recent literature in the nanocellulose-based food packaging field and provide the readers with the state-of-the-art of this research area.

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Influence of TEMPO oxidation on the properties of ethylene glycol methyl ether acrylate grafted cellulose sponges

Cited by 20 publications

References 58 publications

Sponges from Plasma Treated Cellulose Nanofibers Grafted with Poly(ethylene glycol)methyl Ether Methacrylate

Sponges from Plasma Treated Cellulose Nanofibers Grafted with Poly(ethylene glycol)methyl Ether Methacrylate

The measurement of molecular interactions, structure and physical properties of okara cellulose composite hydrogels using different analytical methods

Emerging Food Packaging Applications of Cellulose Nanocomposites: A Review

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