Hydrophobic functionalization reactions of structured cellulose nanomaterials: Mechanisms, kinetics and in silico multi-scale models

Oberlintner, Ana; Likozar, Blaž; Novak, Uroš

doi:10.1016/j.carbpol.2021.117742

Cited by 25 publications

(19 citation statements)

References 154 publications

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“…Besides plants, some bacteria naturally produce cellulose microfibrils, which are referred to as bacterial nanocelluloses (BNCs) [ 11 ]. These three types of nanocelluloses (CNCs, CNFs, and BNCs) have different morphologies (sizes and shapes) depending on their biological origin and the processes used to isolate them [ 12 , 13 ]. Unlike the rigidity of the CNC, the CNF is flexible.…”

Section: Introductionmentioning

confidence: 99%

Functional Nanocellulose, Alginate and Chitosan Nanocomposites Designed as Active Film Packaging Materials

Lavrič¹,

Oberlintner

Fiļipova

et al. 2021

Polymers

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The aim of the study was to characterize and compare films made of cellulose nanocrystals (CNC), nano-fibrils (CNF), and bacterial nanocellulose (BNC) in combination with chitosan and alginate in terms of applicability for potential food packaging applications. In total, 25 different formulations were made and evaluated, and seven biopolymer films with the best mechanical performance (tensile strength, strain)—alginate, alginate with 5% CNC, chitosan, chitosan with 3% CNC, BNC with and without glycerol, and CNF with glycerol—were selected and investigated regarding morphology (SEM), density, contact angle, surface energy, water absorption, and oxygen and water barrier properties. Studies revealed that polysaccharide-based films with added CNC are the most suitable for packaging purposes, and better dispersing of nanocellulose in chitosan than in alginate was observed. Results showed an increase in hydrophobicity (increase of contact angle and reduced moisture absorption) of chitosan and alginate films with the addition of CNC, and chitosan with 3% CNC had the highest contact angle, 108 ± 2, and 15% lower moisture absorption compared to pure chitosan. Overall, the ability of nanocellulose additives to preserve the structure and function of chitosan and alginate materials in a humid environment was convincingly demonstrated. Barrier properties were improved by combining the biopolymers, and water vapor transmission rate (WVTR) was reduced by 15–45% and oxygen permeability (OTR) up to 45% by adding nanocellulose compared to single biopolymer formulations. It was concluded that with a good oxygen barrier, a water barrier that is comparable to PLA, and good mechanical properties, biopolymer films would be a good alternative to conventional plastic packaging used for ready-to-eat foods with short storage time.

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Section: Introductionmentioning

confidence: 99%

Functional Nanocellulose, Alginate and Chitosan Nanocomposites Designed as Active Film Packaging Materials

Lavrič¹,

Oberlintner

Fiļipova

et al. 2021

Polymers

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“…05–0628, NaCl) and amorphous “hump” were examined, and the former was attributed to the preparation technique as the equation ()~() corresponding to alkalinization and etherification, leading to the NaCl left in the CMC. The latter created larger spaces between chains and resulted in a porous structure, 24 the replaceable hydroxyl group involved in the chains gave its high reactivity.…”

Section: Resultsmentioning

confidence: 99%

A strategy to improve the compatibility of carboxyl methyl cellulose with silica fume‐based geopolymer inorganic siliceous coatings for flame‐retarding plywood

Wang

Kou

Zhao

et al. 2022

J of Applied Polymer Sci

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To seek an effective strategy for improving the compatibility of carboxyl methyl cellulose (CMC) with silica fume-based geopolymer composite flameretarding coatings, a novel silica aerogel (SA) doped inorganic siliceous hybrid coating is fabricated by sol-gel. Results show that an appropriate dosage (0.5 wt%) of SA ameliorates their compatibility thus imparting an enhanced flame resistance, evidenced by the lowest value of fire growth index (0.22 kWÁm À2 Ás À1 ) decreased by 55% and the average effective heat of combustion (4.16 kWÁkg À1 ) decreased by 31%, the raised flame retardancy index of 5.54 from 1 compared with the control. Because the SA improves the compatibility between the CMC and siliceous colloidal sol, due to its high reactivity, electrostatic repulsion involved in SiO(OH) 3 À , and high porosity, leading to an enhanced crosslinking during film-forming of the hybrid coatings. Meanwhile, the reduction between CMC and silica occurs with a swelling fire shield, evidenced by the generated silicon involved in the as-formed amorphous siliceous residues. Therefore, it proposed a new strategy for optimizing the compatibility of organic-inorganic hybrid fireproof coatings, revealing an efficient design of CMC/inorganic siliceous flame retardants, high-value recycling technology of solid waste, low-carbon, and sustainable materials.

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“…For the chemical modification process, the overall goal is to endow polysaccharides with more functionalities and better physicochemical properties for application in vivo. [ 118,119 ] From a structural point of view, it is of great significance to precisely control the modification or to obtain polysaccharides with accurate structure, composition, and narrowly distributed molecular weight. Biorthogonal reactions that are characterized by high efficiency and accuracy may bring assets to the chemical modification of polysaccharides.…”

Section: Discussionmentioning

confidence: 99%

Natural Glycan Derived Biomaterials for Inflammation Targeted Drug Delivery

Niu

Xue

2021

Macromolecular Bioscience

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Inflammation is closely related to a variety of fatal or chronic diseases. Hence, targeting inflammation provides an alternative approach to improve the therapeutic outcome of diseases such as solid tumors, neurological diseases, and metabolic diseases. Polysaccharides are natural components with immune regulation, anti‐virus, anti‐cancer, anti‐inflammation, and anti‐oxidation activities. Herein, this review highlights recent progress in the polysaccharide‐based drug delivery systems for achieving inflammation targeting and its related disease treatment. Moreover, the chemical modification and the construction of polysaccharide materials for drug delivery are discussed in detail.

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Hydrophobic functionalization reactions of structured cellulose nanomaterials: Mechanisms, kinetics and in silico multi-scale models

Cited by 25 publications

References 154 publications

Functional Nanocellulose, Alginate and Chitosan Nanocomposites Designed as Active Film Packaging Materials

Functional Nanocellulose, Alginate and Chitosan Nanocomposites Designed as Active Film Packaging Materials

A strategy to improve the compatibility of carboxyl methyl cellulose with silica fume‐based geopolymer inorganic siliceous coatings for flame‐retarding plywood

Natural Glycan Derived Biomaterials for Inflammation Targeted Drug Delivery

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