Comparison of Regenerated Cellulose Membrane Coagulated in Sulphate Based Coagulant

Mazlan, Nyak Syazwani Nyak; Zakaria, Sarani; Gan, Sinyee; Chia, Chin Hua; Baharin, Khairunnisa Waznah

doi:10.1590/01047760201925012586

Cited by 17 publications

(9 citation statements)

References 35 publications

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“…The effect of the coagulant on cellulose membrane formation from NaOH/urea solutions was studied. The solutions were coagulated in either distilled water, 5 wt% H 2 SO 4 , or 5 wt% (NH 4 ) 2 SO 4 [126]. Membranes obtained from distilled water had the highest tensile strength and crystallinity index but showed the lowest value for elongation at break.…”

Section: Mechanism Of Regeneration Of Dissolved Cellulosementioning

confidence: 99%

Cellulose in Ionic Liquids and Alkaline Solutions: Advances in the Mechanisms of Biopolymer Dissolution and Regeneration

et al. 2019

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This review is focused on assessment of solvents for cellulose dissolution and the mechanism of regeneration of the dissolved biopolymer. The solvents of interest are imidazole-based ionic liquids, quaternary ammonium electrolytes, salts of super-bases, and their binary mixtures with molecular solvents. We briefly discuss the mechanism of cellulose dissolution and address the strategies for assessing solvent efficiency, as inferred from its physico-chemical properties. In addition to the favorable effect of lower cellulose solution rheology, microscopic solvent/solution properties, including empirical polarity, Lewis acidity, Lewis basicity, and dipolarity/polarizability are determinants of cellulose dissolution. We discuss how these microscopic properties are calculated from the UV-Vis spectra of solvatochromic probes, and their use to explain the observed solvent efficiency order. We dwell briefly on use of other techniques, in particular NMR and theoretical calculations for the same purpose. Once dissolved, cellulose is either regenerated in different physical shapes, or derivatized under homogeneous conditions. We discuss the mechanism of, and the steps involved in cellulose regeneration, via formation of mini-sheets, association into "mini-crystals", and convergence into larger crystalline and amorphous regions. We discuss the use of different techniques, including FTIR, X-ray diffraction, and theoretical calculations to probe the forces involved in cellulose regeneration.

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Section: Mechanism Of Regeneration Of Dissolved Cellulosementioning

confidence: 99%

Cellulose in Ionic Liquids and Alkaline Solutions: Advances in the Mechanisms of Biopolymer Dissolution and Regeneration

et al. 2019

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“…erefore, some modifications on biodegradable composite-based food packaging are clearly described in the next section. 7) is a polysaccharide chain, which consists of D-glucopyranose units connected by ß-1,4 glycoside linkages, with highly packed structure due to the inter-and intramolecular hydrogen bonds [137,138]. Among biodegradable materials, cellulose is one of the world's most abundant renewable matter and an attractive natural polymer in the fabrication of green food packaging.…”

Section: Biodegradable Compositementioning

confidence: 99%

A Review of Nonbiodegradable and Biodegradable Composites for Food Packaging Application

Alim

Shirajuddin

Anuar

2022

Journal of Chemistry

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The dependency on nonbiodegradable-based food packaging, increase in population growth, and persistent environmental problems are some of the driving forces in considering the development of biodegradable food packaging. This effort of green packaging has the potential to solve issues on plastic wastes through the combination of biodegradable composite-based food packaging with plant extracts, nanomaterials, or other types of polymer. Modified biodegradable materials have provided numerous alternatives for producing green packaging with mechanical strength, thermal stability, and barrier performance that are comparable to the conventional food packaging. To the best of our knowledge, the performance of nonbiodegradable and biodegradable composites as food packaging in terms of the above properties has not yet been reviewed. In this context, the capability of biodegradable polymers to substitute the nonbiodegradable polymers was emphasized to enhance the packaging biodegradation while retaining the mechanical strength, thermal stability, barrier properties, and antioxidant and antimicrobial or antibacterial activity. These are the ultimate goal in the food industry. This review will impart useful information on the properties of food packaging developed from different polymers and future outlook toward the development of green food packaging.

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“…Among the regenerated cellulose products, regenerated cellulose membrane (RCM) is our primary interest. It is physically approximately 0.018–0.020 mm thick, containing more than 90% water with a moist surface, being opaque, non-foldable, and easily torn when stretched [ 8 ]. The RCM is then identified as regenerated cellulose film (RCF) via the drying process.…”

Section: Introductionmentioning

confidence: 99%

Drying Regimes on Regenerated Cellulose Films Characteristics and Properties

et al. 2022

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Abundant water content and its interaction with cellulose macromolecules through hydrogen bonding engenders a complex drying process, the circumstances of which have not yet been unveiled. For instance, excessive drying on regenerated cellulose membranes (RCM) causes cracking and severe shrinking, affecting the produced regenerated cellulose film (RCF). Thus, mathematical models in estimating the drying kinetics and required energy to dry RCM are necessary. This study evaluated two drying techniques of oven drying and infrared (IR) drying on RCM at different temperatures of 50–80 °C. Five mathematical models were used, namely Newton, Page, Handreson–Pabis, logarithmic, and Wang–Singh, to adjust the obtained experimental data and were statistically validated using ANOVA to review their effect on the quality of the produced RCF. A logarithmic model and a Wang–Singh model were the best models for oven drying and IR drying of RCM, respectively. It was found that the physical property of the RCF was similar to all drying types. Meanwhile, for mechanical properties, the high temperature of oven drying affected the tensile properties of RCF compared with IR drying. This study is beneficial by approximating the drying kinetics of RCM and defining appropriate drying conditions, which controls the quality of its predictive physical and mechanical properties.

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Comparison of Regenerated Cellulose Membrane Coagulated in Sulphate Based Coagulant

Abstract: Regenerated cellulose membrane (RCM) coagulated in distilled water has higher mechanical strength compare with membrane coagulated in other coagulant. RCM coagulated in H 2 SO 4 and (NH 4) 2 SO 4 has the lower crystallinity index compared that coagulated in distilled water.

Cited by 17 publications

References 35 publications

Cellulose in Ionic Liquids and Alkaline Solutions: Advances in the Mechanisms of Biopolymer Dissolution and Regeneration

Cellulose in Ionic Liquids and Alkaline Solutions: Advances in the Mechanisms of Biopolymer Dissolution and Regeneration

A Review of Nonbiodegradable and Biodegradable Composites for Food Packaging Application

Drying Regimes on Regenerated Cellulose Films Characteristics and Properties

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