Structure and properties of the regenerated cellulose membranes prepared from cellulose carbamate in NaOH/ZnO aqueous solution

Fu, Feiya; Guo, Yi; Wang, Yang; Tan, Qingyue; Zhou, Jinping; Zhang, Lina

doi:10.1007/s10570-014-0297-0

Cited by 43 publications

(39 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Yuan Mao and co‐workers suggested that the water permeability are related to porosity and amount of through pore in the membranes . Therefore, as compared to the previous study (Table ), it is worth to note that the low in permeability in this study is due to the low in mean pore size and porosity . Membranes with high hydrophilicity properties and low surface roughness are very crucial in filtration and separation since these lead to a lower fouling tendency .…”

Section: Resultsmentioning

confidence: 53%

“…The differences in mean pore size and the porosity is likely due to different fabrication approach implemented. Feiya and coworkers concluded that the larger pores of the RCM were easily formed with low coagulation concentration than those from the coagulation bath with a higher concentration . In addition, it have been concluded that the RCM coagulated with acidic aqueous solution produces smaller pore size and narrower distribution than those of RCM coagulated with pure water and salt aqueous solution, whereas those coagulated with organic coagulant possesses relatively large pore size and wide distribution …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

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

Mohamed

Salleh

Jaafar

et al. 2015

J of Applied Polymer Sci

View full text Add to dashboard Cite

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

show abstract

Section: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

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

View full text Add to dashboard Cite

show abstract

“…33 This could be attributed to the formation of hydrogen bonds between CCs and ZnO. 45,46 Effect of the reaction conditions and urea content on the solubility of CCs in NaOH/ZnO solutions are shown in Figure 8. With an increase of the reaction temperature, the solubility of CCs obtained from CU1, CU2 and CU3 mixtures increased significantly.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

Improved Synthesis of Cellulose Carbamates with Minimum Urea Based on an Easy Scale-up Method

Wang

et al. 2015

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

Cellulose carbamates (CCs) were successfully prepared from cellulose/urea (CU) mixtures based on an easy scale-up method and minimum urea. Urea content and the reaction conditions on the nitrogen content of the reacted CU (RCU) mixtures and CCs were systematically investigated. RCU mixtures and CCs were characterized with elemental analysis, Fourier transform infrared spectroscopy, X-ray diffraction, NMR spectrometry and solubility testing. The result indicated that almost all of urea was involved in the derivatization reaction and cellulose was converted into CC with absence of byproducts. The nitrogen content of CCs increased with an increase of the urea content and the reaction temperature, as well as the reaction time. CCs retained the cellulose I crystalline, and the degree of polymerization hardly changed with the reaction conditions. CCs prepared from CU mixtures with the urea content of 3.4−4.6 wt % displayed good solubility in NaOH/ZnO aqueous solutions. Especially, RCU mixtures without washing could be also well dissolved in NaOH/ZnO solutions and its solubility could reach 97%. This work provided a simple, pollution-free and economic pathway for preparing CCs, which is expected to be useful for the CarbaCell process.

show abstract

“…For example, alkaline‐soluble cellulose carbamate can be produced through a reaction between cellulose and urea at elevated temperatures (generally around the melting point of urea) . Cellulose carbamate has good solubility in NaOH solution, especially in the presence of ZnO, and it has been used to produce cellulose‐based membranes and filaments …”

Section: Introductionmentioning

confidence: 99%

“…For example, alkaline-soluble cellulose carbamate can be produced through ar eaction between cellulose and urea at elevated temperatures (generally around the melting point of urea). [17] Cellulose carbamate has good solubility in NaOH solution, especially in the presence of ZnO, and it has been used to produce cellulose-based membranes [18] and filaments. [19] Urea and many of its derivatives are promising chemicals for cellulosem odification because they can be produced in as ustainable way from CO 2 , [20,21] thus providing am ethod by which to attach CO 2 to biomaterials with improved properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Alkaline‐Soluble Cellulose Methyl Carbamate Using a Reactive Deep Eutectic Solvent

Sirviö

Heiskanen

2016

ChemSusChem

View full text Add to dashboard Cite

This study presents the use of a reactive deep eutectic solvent (DES) for the chemical modification of wood cellulose fibers. DES based on dimethylurea and ZnCl was used to synthetize cellulose methyl carbamate (CMeC). This synthesis was performed at elevated temperature under solvent-free conditions. Chemical characterization based on FTIR and NMR indicated that methyl carbamate was successfully introduced to cellulose, and a degree of substitution (DS) of 0.17 was obtained after 3 h of reaction at 150 °C. The product with a DS of 0.17 exhibited good alkaline solubility (in 3 % NaOH solution) after freeze-thawing, whereas the original cellulose fibers were practically insoluble even in 9 % NaOH. As dimethylurea can be produced from CO , this method can be used as a sustainable way to obtain novel cellulose materials with desirable properties for use in a wide range of applications.

show abstract

Structure and properties of the regenerated cellulose membranes prepared from cellulose carbamate in NaOH/ZnO aqueous solution

Cited by 43 publications

References 45 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

Improved Synthesis of Cellulose Carbamates with Minimum Urea Based on an Easy Scale-up Method

Synthesis of Alkaline‐Soluble Cellulose Methyl Carbamate Using a Reactive Deep Eutectic Solvent

Contact Info

Product

Resources

About