Lei Linfeng, Lindbråthen Arne, Sandru Marius, Gutierrez Maria Teresa Guzman, Zhang Xiangping, Hillestad Magne, He Xuezhong
Department of Chemical Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
SINTEF Industry, SINTEF AS, NO-7465 Trondheim, Norway.
Polymers (Basel). 2018 Sep 1;10(9):972. doi: 10.3390/polym10090972.
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.
采用离子液体1-乙基-3-甲基咪唑醋酸盐（EmimAc）和二甲基亚砜（DMSO）的混合物来溶解微晶纤维素（MCC）。通过干湿纺丝法在50°C的温和温度下制备了10 wt%的纤维素纺丝液，用于纺制纤维素中空纤维（CHFs）。获得了无缺陷的CHFs，其平均直径和厚度分别为270 µm和38 µm。XRD和FTIR表征均证实，在离子液体中纤维素溶解及纺丝过程中，发生了从纤维素I（MCC）到纤维素II（再生CHFs）的晶体结构转变。热重分析（TGA）表明，再生CHFs在热解过程中呈现出与脱乙酰化醋酸纤维素相似的热解行为。本研究提供了一种合适的方法，可直接使用由纤维素/（EmimAc + DMSO）/H₂O三元体系纺制的纤维素中空纤维前驱体制备中空纤维炭膜。
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