Investigation of cellulose dissolution in morpholinium-based solvents: impact of solvent structural features on cellulose dissolution

Naserifar, Shirin; Koschella, Andreas; Heinze, Thomas; Bernin, Diana; Hasani, Merima

doi:10.1039/d3ra03370h

Cited by 4 publications

(1 citation statement)

References 71 publications

(89 reference statements)

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“…There are several ways to dissolve cellulose, such as the early viscose process, cellulose carbamate process, recent aqueous complexing agents, alkaline solution system, and non-aqueous system [ 17 ]. Unfortunately, most dissolution methods inevitably come with the use of toxic or expensive reagents such as N-dimethylacetamide, ammonium fluoride/dimethyl sulfoxide, and LiClO 4 , which are not conducive to environmental protection [ 18 , 19 , 20 ]. The low-temperature alkaline–urea system is currently a promising method for dissolving cellulose by disrupting the intramolecular and intermolecular hydrogen bonds of cellulose molecules, which possesses the advantages of a great solubilization effect, low energy consumption, and low solvent cost [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of Cellulose Beads with Tunable Graded Pores and High Mechanical Strength

Meng,

Liu,

et al. 2024

Polymers

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Cellulose-based hierarchical porous beads exhibit significant application potential in adsorption and separation systems due to their degradation and biocompatibility. However, the current fabrications of cellulose beads show poor mechanical properties and a difficult-to-regulate hierarchical porous structure, reducing their lifespan of use and limiting their application in fine separation. Here, we reported the facile creep–drop method to prepare cellulose beads that enabled systemic regulation of the macro-size, micropore structures, and mechanical properties by optimizing injection nozzle diameter, the composition of the coagulation bath, the temperature of the coagulation bath, and cellulose concentration. Notably, during the molding process, the H2SO4-Na2SO4 composite solidification bath endowed cellulose beads with a dense shell layer and a loose core layer, which achieved the integration of mechanical properties and high porosity. The cellulose beads exhibited high porosity (93.38–96.18%) and high sphericity (86.78–94.44%) by modulating the shell thickness of the cellulose beads. In particular, the cellulose beads exhibited excellent mechanical properties with a high compressive strength of 544.24 kPa at a 5% cellulose concentration. It is expected that these cellulose beads with tunable microstructures can realize their potential for applications in the fields of wastewater treatment, chemical engineering, bioengineering, medicine, and pharmaceuticals.

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