Preparation and characterization of some cellulose derivatives nanocomposite films

Gökmen, Fatma Özge; Bayramgil, Nursel Pekel

doi:10.1016/j.carbpol.2022.120030

Cited by 11 publications

(1 citation statement)

References 61 publications

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“…Several studies offer a detailed analysis of polymer mixtures morphologically and structurally [ 15 , 17 , 18 ]. The techniques used aim to reveal the structure and the film surface image, as well as to present the interaction between the system’s compounds [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

(Hydroxypropyl)methyl Cellulose-Chitosan Film as a Matrix for Lipase Immobilization—Part ΙΙ: Structural Studies

Vassiliadi

Tsirigotis-Maniecka

Symons

et al. 2022

Gels

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The present work reports on the structural study of a film made of a hybrid blend of biopolymers used as an enzyme carrier. A cellulose derivative (HPMC) and chitosan (CS) were combined in order to formulate a film on which Mucor miehei lipase was immobilized. The film was successfully used as a biocatalyst; however, little is known about the structure of the system. Therefore, small-angle X-ray scattering, Fourier transform infrared spectroscopy (FTIR), optical microscopy, and scanning electron microscopy (SEM), as well as microindentation measurements, were used to shed light on the structure of the promising biocatalyst. Among the results, intermolecular hydrogen bonds were observed between the amide groups of the two polymers and the lipase. The presence of the enzyme does not seem to affect the mechanical properties of the matrix. The used film after 35 cycles of reaction seemed to be fatigued and had lost part of its humidity, explaining the reduction of the enzyme activity.

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Section: Introductionmentioning

confidence: 99%

(Hydroxypropyl)methyl Cellulose-Chitosan Film as a Matrix for Lipase Immobilization—Part ΙΙ: Structural Studies

Vassiliadi

Tsirigotis-Maniecka

Symons

et al. 2022

Gels

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Multi‐Modal Melt‐Processing of Birefringent Cellulosic Materials for Eco‐Friendly Anti‐Counterfeiting

Li,

Qiu,

Yang

et al. 2024

Advanced Materials

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Ubiquitous anti‐counterfeiting materials with a rapidly rising annual consumption (over 1010 m2) can pose a serious environmental burden. Biobased cellulosic materials with birefringence offer attractive sustainable alternatives, but their scalable solvent‐free processing remain challenging. Here, a dynamic chemical modification strategy is proposed for multi‐modal melt‐processing of birefringent cellulosic materials for eco‐friendly anti‐counterfeiting. Relying on the thermal‐activated dynamic covalent‐locking of the spatial topological structure of preferred oriented cellulose, the strategy balances the contradiction between the strong confinement of long‐range ordered structures and the molecular motility required for entropically‐driven reconstruction. Equipped with customizable processing forms including mold‐pressing, spinning, direct‐ink‐writing, and blade‐coating, the materials exhibit a wide color gamut, self‐healing efficiency (94.5%), recyclability, and biodegradability. Moreover, the diversified flexible elements facilitate scalable fabrication and compatibility with universal processing techniques, thereby enabling versatile and programmable anti‐counterfeiting. The strategy is expected to provide references for multi‐modal melt‐processing of cellulose and promote sustainable innovation in the anti‐counterfeiting industry.

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Properties of quaternized and cross-linked hydroxyethylcellulose composite films

Šimkovic,

Gucmann,

Dobročka

et al. 2024

Cellulose

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Although trimetylammonium-2-hydroxypropyl-hydroxyethylcellulose (QHEC) is a well-known polysaccharide material, some of its properties have not been previously studied in detail. Therefore, we applied a combination of multidimensional nuclear magnetic resonance (NMR) in D2O on hydroxyethylcellulose (HEC) and HEC derivatives, and size-exclusion chromatography with multi-angle laser light scattering (SEC-MALS) in carbonate buffer at pH 10; while Fourier-transform infrared spectroscopy (FTIR), the X-ray diffraction (XRD), the thermogravimetry/differential/differential thermogravimetry (TG/DTG/DTA) and atomic force microscopy (AFM) in film form. SEC-MALS revealed various water-solubility of prepared derivatives: HEC (98%) > CHEC (72%) > QHEC (26%) > QCHEC (14%). Due to its substituents, the HEC macromolecule forms coil structures with varying gyration radii: QHEC (38–260 nm) > QCHEC (10–230 nm) > CHEC (21–100 nm) > HEC (23–50 nm). FTIR analysis of all prepared films confirmed their identical structure compared to that observed in liquid form in D2O. Onset temperatures (OT) of films degradation decreased in order: HEC (222 °C) > QCHEC (162 °C) > CHEC (142 °C) > QHEC (141 °C). The X-ray diffraction confirmed residual crystallinity of cellulose II (CII) in all four types of prepared films and was linked to ~ 2% water-insolubility of HEC derivatives revealed by SEC-MALS. Atomic force microscopy (AFM) showed significant differences in surface morphology among the four prepared films with surface roughness of: HEC (25 nm) > QCHEC (5.8 nm) > QHEC (4.2 nm) > CHEC (2.8 nm). Various spherical particles were found in case of HEC, circular depressions/holes approximately 4 μm in diameter were observed in case of QHEC. Except for the HEC, all other films showed granular surface probably due to insoluble components. Based on the mechanisms of quaternization and crosslinking and the results of analysis on water-soluble part and films we could assume that there are similarities in structures between the soluble and insoluble products of the reactions.

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Preparation and characterization of some cellulose derivatives nanocomposite films

Cited by 11 publications

References 61 publications

(Hydroxypropyl)methyl Cellulose-Chitosan Film as a Matrix for Lipase Immobilization—Part ΙΙ: Structural Studies

(Hydroxypropyl)methyl Cellulose-Chitosan Film as a Matrix for Lipase Immobilization—Part ΙΙ: Structural Studies

Multi‐Modal Melt‐Processing of Birefringent Cellulosic Materials for Eco‐Friendly Anti‐Counterfeiting

Properties of quaternized and cross-linked hydroxyethylcellulose composite films

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