Gelation of cellulose-NaOH solutions in the presence of cellulose fibers

Cellulose dissolution and gelation in NaOH(aq) under controlled CO2 atmosphere: supramolecular structure and flow properties

“…After freezing and thawing, the amount of undissolved fibers decreases marginally, and the system remains gelated (see Figure S3b). The gelation of alkali-dissolved cellulose has been discussed, 39 and time and temperature have been shown to influence molecular entanglement and crystallization. 16,39 In this study, the kinetics of cellulose gelation below the linear viscoelastic region was followed by microscopy and rheology (Figures 1b, S4) and a master curve for a system with 7 wt% cellulose subjected to 1% strain (10 rad .…”

Cellulose dissolution and gelation in NaOH(aq) under controlled CO2 atmosphere: supramolecular structure and flow properties

“…The optical images (Figure 1a) confirm a dissolved, gel state at 12% cellulose concentration, indicating a dissolution limit. The gelation of alkali-dissolved cellulose has been discussed, 39 and time and temperature have been shown to influence molecular entanglement and crystallization. 16,39 In this study, the kinetics of cellulose gelation below the linear viscoelastic region was followed by microscopy and rheology (Figures 1b, S3) and a master curve for a system with 7 wt% cellulose subjected to 1% strain (10 rad .…”

“…The gelation of alkali-dissolved cellulose has been discussed, 39 and time and temperature have been shown to influence molecular entanglement and crystallization. 16,39 In this study, the kinetics of cellulose gelation below the linear viscoelastic region was followed by microscopy and rheology (Figures 1b, S3) and a master curve for a system with 7 wt% cellulose subjected to 1% strain (10 rad . s -1 ) showed an exponential dependence between the time to gelation (t, min) and temperature (T, °C): 39…”

All‐cellulose composites prepared by partially dissolving cellulose using NaOH/thiourea aqueous solution

“…Cellulose is soluble in neither water nor common organic solvents since there are many hydrogen bonds inside and between molecules, which greatly limits its processability and application 9 . Researchers have developed a series of solvent systems for dissolving cellulose, including N‐methylmorpholine‐N‐oxide (NMMO), 11 LiCl/N, N‐dimethylacetamide (LiCl/DMAc), 12 ionic liquids (ILs), 13 NaOH aqueous solutions, 14 NaOH/urea aqueous solutions, 15 and NaOH/thiourea aqueous solutions 16 . Among them, NaOH/thiourea aqueous solutions, a green and efficient cellulose solvent, could dissolve cellulose at room temperature (8°C), 16 which will be more conducive to the realization of industrialization.…”