Abstract
The mixture of the ionic liquid 1-ethyl-3-methylimidazolium acetate (EmimAc) and dimethylsulfoxide (DMSO) was employed to dissolve microcrystalline cellulose (MCC). A 10 wt % cellulose dope solution was prepared for spinning cellulose hollow fibers (CHFs) under a mild temperature of 50 °C by a dry-wet spinning method. The defect-free CHFs were obtained with an average diameter and thickness of 270 and 38 μm, respectively. Both the XRD and FTIR characterization confirmed that a crystalline structure transition from cellulose I (MCC) to cellulose II (regenerated CHFs) occurred during the cellulose dissolution in ionic liquids and spinning processes. The thermogravimetric analysis (TGA) indicated that regenerated CHFs presented a similar pyrolysis behavior with deacetylated cellulose acetate during pyrolysis process. This study provided a suitable way to directly fabricate hollow fiber carbon membranes using cellulose hollow fiber precursors spun from cellulose/(EmimAc + DMSO)/H2O ternary system.
Original language | English |
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Article number | 972 |
Journal | Polymers |
Volume | 10 |
Issue number | 9 |
DOIs | |
State | Published - 1 Sep 2018 |
Externally published | Yes |
Keywords
- Cellulose
- Hollow fiber
- Ionic liquids
- Spinning
- Viscosity