Spinning Cellulose Hollow Fibers Using 1-Ethyl-3-methylimidazolium Acetate⁻Dimethylsulfoxide Co-Solvent

Linfeng Lei; Arne Lindbråthen; Marius Sandru; Maria Teresa Guzman Gutierrez; Xiangping Zhang; Magne Hillestad; Xuezhong He

doi:10.3390/polym10090972

Spinning Cellulose Hollow Fibers Using 1-Ethyl-3-methylimidazolium Acetate⁻Dimethylsulfoxide Co-Solvent

Polymers (Basel). 2018 Sep 1;10(9):972. doi: 10.3390/polym10090972.

Authors

Linfeng Lei¹, Arne Lindbråthen², Marius Sandru³, Maria Teresa Guzman Gutierrez⁴, Xiangping Zhang⁵, Magne Hillestad⁶, Xuezhong He⁷

Affiliations

¹ Department of Chemical Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway. linfeng.lei@ntnu.no.
² Department of Chemical Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway. arne.lindbrathen@ntnu.no.
³ SINTEF Industry, SINTEF AS, NO-7465 Trondheim, Norway. marius.sandru@sintef.no.
⁴ Department of Chemical Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway. maria.t.g.gutierrez@ntnu.no.
⁵ Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing 100190, China. xpzhang@ipe.ac.cn.
⁶ Department of Chemical Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway. magne.hillestad@ntnu.no.
⁷ Department of Chemical Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway. xuezhong.he@ntnu.no.

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.

Keywords: cellulose; hollow fiber; ionic liquids; spinning; viscosity.

Grants and funding

267615/Norges Forskningsråd