Hydrogels of TEMPO-oxidized nanocellulose were stabilized for dry-jet wet spinning using a shell of cellulose dissolved in 1,5-diazabicyclo[4.3.0]non-5-enium propionate ([DBNH][CO2Et]), a protic ionic liquid (PIL). Coagulation in an acidic water bath resulted in continuous core-shell filaments (CSFs) that were tough and flexible with an average dry (and wet) toughness of ∼11 (2) MJ·m-3 and elongation of ∼9 (14) %. The CSF morphology, chemical composition, thermal stability, crystallinity, and bacterial activity were assessed using scanning electron microscopy with energy-dispersive X-ray spectroscopy, liquid-state nuclear magnetic resonance, Fourier transform infrared spectroscopy, thermogravimetric analysis, pyrolysis gas chromatography-mass spectrometry, wide-angle X-ray scattering, and bacterial cell culturing, respectively. The coaxial wet spinning yields PIL-free systems carrying on the surface the cellulose II polymorph, which not only enhances the toughness of the filaments but facilities their functionalization.

中文翻译：

---

全纤维素系统的同轴纺丝，以增强韧性：质子离子液体再生的纤维素II中包覆的氧化纳米纤维丝。

使用溶解在质子离子液体1,5-二氮杂双环[4.3.0]非5-en丙酸酯（[DBNH] [CO2Et]）中的纤维素壳层，稳定TEMPO氧化的纳米纤维素的水凝胶，以用于干喷湿纺。 （PIL）。在酸性水浴中凝结产生连续的核-壳长丝（CSF），它们坚韧而柔韧，平均干（湿）韧度约为11（2）MJ·m-3，而伸长率约为9（14）％ 。使用扫描电子显微镜和能量色散X射线光谱，液相核磁共振，傅立叶变换红外光谱，热重分析，热解气相色谱-质谱法评估CSF形态，化学成分，热稳定性，结晶度和细菌活性光谱法，广角X射线散射法和细菌细胞培养法。