Effects of Different Ionic Liquids as Green Solvents on the Formation and Ultrafiltration Performance of CA Hollow Fiber Membranes
| Autor: | Tai-Shung Chung, Wen Yi Dong, Ding Yu Xing |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Thiocyanate
Hydrogen bond General Chemical Engineering Ultrafiltration 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Cellulose acetate Industrial and Manufacturing Engineering 0104 chemical sciences Shear rate chemistry.chemical_compound Membrane chemistry Chemical engineering Ionic liquid Organic chemistry Fiber 0210 nano-technology |
| Zdroj: | Industrial & Engineering Chemistry Research. 55:7505-7513 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/acs.iecr.6b01603 |
| Popis: | In this work, we have examined and compared the interactions between cellulose acetate and different ionic liquids at a molecular level and explored their effects on dope rheology, hollow fiber morphology, and performance. Ionic liquid, 1-ethyl-3-methylimidazolium acetate ([EMIM]OAc), was found to interact with cellulose acetate (CA) more closely with intensive hydrogen bonds than 1-ethyl-3-methylimidazolium thiocyanate ([EMIM]SCN). Thus, the CA/[EMIM]OAc solution exhibits a more pronounced charge-ordered network than the CA/[EMIM]SCN solution. In addition, the former does not obey the Cox–Merz rule, whereas the latter obeys the rule with its shear viscosity η identical to its complex viscosity |η*| at the equivalent shear rate and angular frequency. These dissimilar factors have contributed to an instantaneous liquid–liquid demixing and resulted in a dense outer skin surface and a porous cross-sectional structure comprising macrovoids for the CA/OAc membrane. In contrast, the CA/SCN membrane has a looser... |
| Databáze: | OpenAIRE |
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