A New Proposal of Preparation of Different Polymorphs of Nanocellulose from Eucalyptus citriodora

Souza, Alana G.; Junqueira, Mariana T.; Lima, Giovanni F. de; Rangari, Vijaya K.; Rosa, Derval dos Santos

doi:10.1007/s10924-020-01672-4

Cited by 18 publications

(14 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…65 The importance of higher crystallinity index, however, will be dependent on CNCs application. Since the crystallinity affects the mechanical and physical properties, 66 the high crystallinity CNCs might be useful as reinforcement in nanocomposites, while the low crystallinity CNCs can be indicated to be applied as a food thickener or pickering emulsion. 66 Although the crystallinity might affect the strength and ber stiffness, the presence of the cellulose surface functional groups also plays a signicant role in determining the applicability and reinforcing behavior of the CNCs.…”

Section: Xrd Analysismentioning

confidence: 99%

The valorization of municipal grass waste for the extraction of cellulose nanocrystals

et al. 2020

View full text Add to dashboard Cite

show abstract

Section: Xrd Analysismentioning

confidence: 99%

The valorization of municipal grass waste for the extraction of cellulose nanocrystals

et al. 2020

View full text Add to dashboard Cite

show abstract

“…This feature is very important because there are four polymorphous of cellulose (I, II, III and IV) which can be used for different purposes. For example, type I is used for wound dressing and reinforcing agents, type II as raw material for bioethanol and pharmaceutical tablets, type III as stabilizer and type IV for aerogels 75‐78 . This work only investigates types I and II polymorphs because III and IV are obtained with other type of chemicals and treatments (anhydrous ethylamine or liquid ammonia at high temperature) 79 which are not employed here.…”

Section: Resultsmentioning

confidence: 99%

CNCs extraction from single‐use cups: effects of grafting it onto MMA monomer

Juárez‐Méndez

Palma‐Ramírez

Brachetti-Sibaja

et al. 2023

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND: The difficulty of separating fiber from polyolefin coatings of single-use plastic (SUP) cups for cold (carbonated) or hot (coffee) drinks, has led us to investigate a recycling method to obtain new high-performance materials. The present work relates to valorization of ICEE S.A. de C.V. cups into crystalline nanocellulose (CNC), while studying the effects on the structural, thermal, morphological and particle size properties in dependence of the acid hydrolysis concentration (40 and 64% v/v) employing sulfuric acid to remove amorphous cellulose.RESULTS: On the basis of results, optimal CNC was found at 64% v/v concentration obtaining ribbon-like morphologies rich in cellulose types I⊍ (27%) and II (45.1%) of triclinic and monoclinic structures, respectively, high crystallinity percentage (91%) and nanosize scale (26.70 nm). CNC was successfully grafted through the C 2 in cellulose onto the methyl methacrylate (MMA) monomer to obtain PMMA-g-CNC, considering different concentrations (5, 10, 20 and 30 wt%) of CNC. A reduction of crystallinity % was found when CNC is grafted onto MMA owing to the amorphous nature of the poly(methyl methacrylate) (PMMA). However, this is not a limitation.CONCLUSIONS: PMMA-g-CNC samples displayed high thermal stability (345 °C) and nanometric scale (165-260 nm), which have potential to be studied as reinforcement agents for incompatible polymers such as PMMA and poly(urethane) (PU) through Interpenetrating Polymer Networks. Preliminary mechanical studies indicated that PMMA-g-CNC systems are able to reinforce the tensile properties becoming the PMMA/PU into ductile materials. Specially, the MMA 90 CNC 10 system improved the strain four-fold compared to the pure PMMA/PU IPN.

show abstract

“…However, changes in the structures related to the hemicellulose and lignin components in NFC resulting from chemical treatments of yerba mate residues may occur. [ 36 ]…”

Section: Resultsmentioning

confidence: 99%

“…However, changes in the structures related to the hemicellulose and lignin components in NFC resulting from chemical treatments of yerba mate residues may occur. [36] Upon analyzing the samples of the hydrogels only with CMC (HC), with NFC (HCN), and those encapsulated with sodium alginate (HCNA) and with garlic oil (HCNAO), it was observed that there were no significant changes between the bands. Only a small alteration in the appearance of peaks was observed in the region between 2800 and 3000 cm −1 in the HCNAO sample in relation to the others.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

Fungicidal Potential of Polymeric Hydrogels Based on Carboxymethylcellulose and Yerba Mate Residues with the Incorporation of Garlic Oil

et al. 2022

View full text Add to dashboard Cite

In the present study, hydrogels are developed from carboxymethylcellulose, with the addition of cellulose nanofibers (CNFs) obtained from yerba mate stick residues and garlic oil. CNFs are obtained via physical (steam explosion), chemical (bleaching), and mechanical (ultrafine friction milling) processes. Garlic oil is encapsulated into sodium alginate for the evaluation of fungicidal potential. The samples are assessed for characteristics such as water absorption capacity (swelling) and inhibitory activity against Fusarium sp. FUS147 in vitro by Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). TGA and FTIR spectra confirm the cross-linking mechanism for citric acid in sodium carboxymethylcellulose (CMC) in the hydrogel formation. The incorporation of CNFs, sodium alginate, and garlic oil reduces the temperature at the beginning of thermal degradation, to 47, 38, and 31 °C, respectively, in relation to a hydrogel sample with only carboxymethylcellulose (HC). The swelling analysis reveals an increase of 57% for a sample with CNF, and 42% for a sample with incorporation of garlic oil encapsulated in alginate, in relation to the HC sample. The sample with encapsulated garlic oil shows a high degree of swelling with broad antifungal activity against the Fusarium sp. FUS147, showing great potential for use in agriculture.

show abstract

A New Proposal of Preparation of Different Polymorphs of Nanocellulose from Eucalyptus citriodora

Cited by 18 publications

References 24 publications

The valorization of municipal grass waste for the extraction of cellulose nanocrystals

The valorization of municipal grass waste for the extraction of cellulose nanocrystals

CNCs extraction from single‐use cups: effects of grafting it onto MMA monomer

Fungicidal Potential of Polymeric Hydrogels Based on Carboxymethylcellulose and Yerba Mate Residues with the Incorporation of Garlic Oil

Contact Info

Product

Resources

About