Butanol-mediated oven-drying of nanocellulose with enhanced dehydration rate and aqueous re-dispersion

Hanif, Zahid; Jeon, Hyeonyeol; Tran, Thang Hong; Jegal, Jonggeon; Park, Seul‐A; Kim, Seon-Mi; Park, Jeyoung; Hwang, Sung Yeon; Oh, Dongyeop X.

doi:10.1007/s10965-017-1343-z

Cited by 34 publications

(20 citation statements)

References 48 publications

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“…The CNF and BNNS particles did not precipitate even after 1 year, indicating that both particles were stably dispersed in the aqueous solutions. Other types of cellulose nanomaterials with surface charges, such as cellulose nanocrystals and carboxylated CNF, are transparent [ 20 ]. However, CNF has no surface charge and its fibers were partially aggregated, resulting in an opaque dispersion [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

“…As previously mentioned, CNF films typically exhibit an OTR of <1 cc/m 2 /day under ideal conditions. However, during large-scale production of CNF films, the capillary force induced by water drying can result in pinholes in the film [ 20 ]. The OTR values of the BNNS-containing CNF composites gradually decreased with increasing BNNS content to 4.7 cc/m 2 /day.…”

Section: Resultsmentioning

confidence: 99%

“…Cellulose nanofiber (CNF) is a sustainable and biocompatible nanomaterial [ 10 ] and is a potential food- and medicine-packaging material [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. It is produced by mechanically disintegrating highly crystalline nanofibrils in cellulose bulk, the most abundant biomass [ 10 , 20 ]. Coatings and films composed of CNF can achieve an OTR of less than 1 cc/m 2 /day, which is suitable for the packaging of most foods and medicines [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…It is questionable whether the oxygen barrier performance of CNFs can be reproduced in an industrial setting. CNF films are typically produced from aqueous dispersion by air drying, and the resultant films often exhibit high OTR values (19.08 cc/m 2 /day, by our measurement), because the capillary force during drying results in a heterogeneous surface [ 20 ]. The OTR value is as high as that of bare PET.…”

Section: Introductionmentioning

confidence: 99%

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Sustainable Boron Nitride Nanosheet-Reinforced Cellulose Nanofiber Composite Film with Oxygen Barrier without the Cost of Color and Cytotoxicity

et al. 2018

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This paper introduces a boron nitride nanosheet (BNNS)-reinforced cellulose nanofiber (CNF) film as a sustainable oxygen barrier film that can potentially be applied in food packaging. Most commodity plastics are oxygen-permeable. CNF exhibits an ideal oxygen transmission rate (OTR) of <1 cc/m 2 /day in highly controlled conditions. A CNF film typically fabricated by the air drying of a CNF aqueous solution reveals an OTR of 19.08 cc/m 2 /day. The addition of 0-5 wt % BNNS to the CNF dispersion before drying results in a composite film with highly improved OTR of 4.7 cc/m 2 /day, which is sufficient for meat and cheese packaging. BNNS as a 2D nanomaterial increases the pathway of oxygen gas and reduces the chances of pinhole formation during film fabrication involving water drying. In addition, BNNS improves the mechanical properties of the CNF films (Young's modulus and tensile strength) without significant elongation reductions, probably due to the good miscibility of CNF and BNNS in the aqueous solution. Addition of BNNS also produces negligible color change, which is important for film aesthetics. An in vitro cell experiment was performed to reveal the low cytotoxicity of the CNF/BNNS composite. This composite film has great potential as a sustainable high-performance food-packaging material.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sustainable Boron Nitride Nanosheet-Reinforced Cellulose Nanofiber Composite Film with Oxygen Barrier without the Cost of Color and Cytotoxicity

et al. 2018

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“…The use of alcohols such as ethanol, methanol and butanol in nanocellulose drying provides more interfibrillar distance than water only due to their higher molecular size as compared to water molecules. This is beneficial in reducing interfibrillar contacts and adhesion between nanocellulose fibers [ 73 , 74 ].…”

Section: Resultsmentioning

confidence: 99%

Melt- vs. Non-Melt Blending of Complexly Processable Ultra-High Molecular Weight Polyethylene/Cellulose Nanofiber Bionanocomposite

et al. 2021

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The major hurdle in melt-processing of ultra-high molecular weight polyethylene (UHMWPE) nanocomposite lies on the high melt viscosity of the UHMWPE, which may contribute to poor dispersion and distribution of the nanofiller. In this study, UHMWPE/cellulose nanofiber (UHMWPE/CNF) bionanocomposites were prepared by two different blending methods: (i) melt blending at 150 °C in a triple screw kneading extruder, and (ii) non-melt blending by ethanol mixing at room temperature. Results showed that melt-processing of UHMWPE without CNF (MB-UHMWPE/0) exhibited an increment in yield strength and Young’s modulus by 15% and 25%, respectively, compared to the Neat-UHMWPE. Tensile strength was however reduced by almost half. Ethanol mixed sample without CNF (EM-UHMWPE/0) on the other hand showed slight decrement in all mechanical properties tested. At 0.5% CNF inclusion, the mechanical properties of melt-blended bionanocomposites (MB-UHMWPE/0.5) were improved as compared to Neat-UHMWPE. It was also found that the yield strength, elongation at break, Young’s modulus, toughness and crystallinity of MB-UHMWPE/0.5 were higher by 28%, 61%, 47%, 45% and 11%, respectively, as compared to the ethanol mixing sample (EM-UHMWPE/0.5). Despite the reduction in tensile strength of MB-UHMWPE/0.5, the value i.e., 28.4 ± 1.0 MPa surpassed the minimum requirement of standard specification for fabricated UHMWPE in surgical implant application. Overall, melt-blending processing is more suitable for the preparation of UHMWPE/CNF bionanocomposites as exhibited by their characteristics presented herein. A better mechanical interlocking between UHMWPE and CNF at high temperature mixing with kneading was evident through FE-SEM observation, explains the higher mechanical properties of MB-UHMWPE/0.5 as compared to EM-UHMWPE/0.5.

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Oven‐Drying Microfibrillated Cellulose Covered with a Low Molecular Weight Copolymer for Dispersion in a Polymer Matrix

Dias

Chinelatto

2022

Macromolecular Symposia

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Hornification remains a great challenge to the large‐scale use of oven‐dried microfibrillated cellulose (MFC) in industrial processes due to the difficulty to redisperse the oven‐dried MFC, especially in non‐polar polymer matrices. Therefore, an MFC coverage treatment with a low molecular weight copolymer is proposed here as a method to overcome hornification. MFC‐copolymer is produced by mechanical stirring and then oven‐dried. A poly(lactic acid) (PLA)/poly(ε‐caprolactone) (PCL)/MFC‐copolymer blend is prepared by melt extrusion to assess the dispersiveness of the treated MFC into the polymer matrix. Fourier Transform Infrared (FTIR) results suggest that the copolymer terminal hydroxyls can interact with the reactive hydroxyls present on the MFC surface, decreasing MFC hydrophilicity. Scanning Electron Microscopy (SEM) confirms that the copolymer covers parts of the MFC surface, which enables the microfibrils' redispersion. The solvent‐free, eco‐friendly, and low‐cost MFC‐copolymer treatment facilitates MFC redispersion by melting extrusion process in a low polarity polymeric matrix.

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Butanol-mediated oven-drying of nanocellulose with enhanced dehydration rate and aqueous re-dispersion

Cited by 34 publications

References 48 publications

Sustainable Boron Nitride Nanosheet-Reinforced Cellulose Nanofiber Composite Film with Oxygen Barrier without the Cost of Color and Cytotoxicity

Sustainable Boron Nitride Nanosheet-Reinforced Cellulose Nanofiber Composite Film with Oxygen Barrier without the Cost of Color and Cytotoxicity

Melt- vs. Non-Melt Blending of Complexly Processable Ultra-High Molecular Weight Polyethylene/Cellulose Nanofiber Bionanocomposite

Oven‐Drying Microfibrillated Cellulose Covered with a Low Molecular Weight Copolymer for Dispersion in a Polymer Matrix

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