Characterisation of cellulose films regenerated from acetone/water coagulants

Geng, Hongjuan; Yuan, Zaiwu; Fan, Qingrui; Dai, Xiaonan; Zhao, Yue; Wang, Zhaojiang; Qin, Menghua

doi:10.1016/j.carbpol.2013.11.071

Cited by 53 publications

(21 citation statements)

References 43 publications

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“…TEM image as shown in Figure (c) revealed that the formation of the RCM after the regeneration process consisted of compact granular clusters, which indicated the regeneration process would result in dense structure. The results were in agreements with those of recent study reported by Geng and coworkers …”

Section: Resultssupporting

confidence: 94%

“…Recently, a variety of solvents based on aqueous alkali (containing NaOH and urea) have been developed and shown to be suitable for fiber spinning, membrane and aerogel formation, cellulose blending, and homogeneous cellulose modification . A number of researchers reported that the 7 wt % NaOH/ 12 wt % urea aqueous solution pre‐cooled to −12°C has been developed as low cost solvent for rapid dissolution of cellulose . It have been proven that the presence of NaOH hydrates and urea hydrates in the aqueous solution is the key for the cellulose dissolution at low temperature .…”

Section: Introductionmentioning

confidence: 99%

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Feasibility of recycled newspaper as cellulose source for regenerated cellulose membrane fabrication

Mohamed

Salleh

Jaafar

et al. 2015

J of Applied Polymer Sci

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An environmental friendly regenerated cellulose membrane (RCM) was successfully prepared via NaOH/urea aqueous solution system by utilizing recycled newspaper (RNP) as the cellulose source. The morphological and chemical structure of resulting membrane were characterized using scanning electron microscopy (SEM), atomic force microscopy (AFM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) spectroscopy, and thermogravimetric analysis (TGA). Results from FTIR and XRD verified that the transparent RCM possesses cellulose II structure. SEM observation revealed that the transparent RCM consist of homogeneous dense symmetric membrane structure and composed of a skin layer with mean roughness parameter R a , obtained from AFM analysis of 29.53 nm. Pure water flux, water content, water contact angle, porosity, and pore size of the resulting membrane were also measured. This study promotes the potential of the cellulose-based membrane obtained from low cost cellulose source for application in filtration and separation system. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42684. Recently, a variety of solvents based on aqueous alkali (containing NaOH and urea) have been developed and shown to be suitable for fiber spinning, membrane and aerogel formation, cellulose blending, and homogeneous cellulose modification. 20 A number of researchers reported that the 7 wt % NaOH/ 12 wt % urea aqueous solution pre-cooled to 2128C has been

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Section: Resultssupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Feasibility of recycled newspaper as cellulose source for regenerated cellulose membrane fabrication

Mohamed

Salleh

Jaafar

et al. 2015

J of Applied Polymer Sci

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“…As can be seen from Figure , the XRD pattern of WSC showed a typical cellulose I structure, with a broad peak from 14.8° to 16.5° and a diffraction peak at 2 θ = 22.3°, corresponding to the planes (1

\overset{1}{true}

0), (110), and (200), respectively . This indicated that the crystal structure of WSC was not changed during the processes of the delignification and hemicellulose removal.…”

Section: Resultsmentioning

confidence: 82%

Regenerated Cellulose Fibers Prepared from Wheat Straw with Different Solvents

Chen

Guan

Wang

et al. 2015

Macro Materials & Eng

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Wheat straw cellulose (WSC) was simply isolated by delignification and hemicellulose‐removal processes, and then dissolved in five non‐derivatizing solvents, including N, N‐dimethylacetamide /lithium chloride, N‐methylmorpholine‐N‐oxide, 1‐butyl‐3‐methylimidazolium chloride, 1‐allyl‐3‐methylimidazolium chloride and 1‐ethyl‐3‐methylimidazolium acetate, to prepare regenerated cellulose fibers with wet spinning method. The results showed that WSC could be completely dissolved in all of the five solvents, and the chemical structure and thermal stability of the regenerated fibers were similar. However, the viscosity of the solutions, the morphology and mechanical strength of the fibers were highly depended on the type of the solvents.

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“…The crystallinity value of the RCL and RMCC films are greatly lower than that of native CL and MCC (Fig. 4), demonstrating that the true solvation destroys all intermolecular hydrogen bonds; and the regeneration may fail to create new crystals as good as the original (native) ones (Geng et al 2014;Pang et al 2015). The results showed that v c (%) The decrease of crystallinity may be attributed to the agglomeration of Na-MMT occurring in the cellulose at higher clay loading, which retarded recrystallization during regeneration process.…”

Section: Crystallinity Of Regenerated Cellulose and Nanocomposite Basmentioning

confidence: 85%

Cellulose/nanoclay composite films with high water vapor resistance and mechanical strength

et al. 2015

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Cellulose based films were fabricated by dissolving the micro-crystalline cellulose and cotton linter in a LiOH/urea aqueous system, followed by regeneration in acetone. The water vapor transmission rate (WVTR) values of the films were measured and the results indicated that regenerated micro-crystalline cellulose (RMCC) showed lower WTVR than regenerated cotton linter (RCL). WVTR values were proportional to the thickness of samples. The films also exhibited high oil resistance as no fat oil could pass through the RMCC and RCL films even after a week. The RMCC and RCL/natural-montmorillonite nanocomposites (Na-MMT) films were prepared and characterized. The effect of Na-MMT loading on the mechanical, crystallinity and water vapor transmission properties of the nanocomposites was further investigated. Na-MMT loading improved the mechanical properties and decreased the crystallinity of the nanocomposite films. The results indicated partially intercalated nano-layered structures with WVTR as low as 43 g/m 2 /day.

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Characterisation of cellulose films regenerated from acetone/water coagulants

Cited by 53 publications

References 43 publications

Feasibility of recycled newspaper as cellulose source for regenerated cellulose membrane fabrication

Feasibility of recycled newspaper as cellulose source for regenerated cellulose membrane fabrication

Regenerated Cellulose Fibers Prepared from Wheat Straw with Different Solvents

Cellulose/nanoclay composite films with high water vapor resistance and mechanical strength

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