Reyes Guillermo, Lundahl Meri J, Alejandro-Martín Serguei, Arteaga-Pérez Luis E, Oviedo Claudia, King Alistair W T, Rojas Orlando J
Departamento de Ingeniería en Maderas , Universidad del Bı́o-Bı́o , Av. Collao 1202, Casilla 5-C , Concepción , Chile.
Biobased Colloids and Materials, Department of Bioproducts and Biosystems, School of Chemical Engineering , Aalto University , Espoo 02150 , Finland.
Biomacromolecules. 2020 Feb 10;21(2):878-891. doi: 10.1021/acs.biomac.9b01559. Epub 2020 Jan 14.
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][COEt]), 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 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.
使用溶解在质子离子液体1,5 - 二氮杂双环[4.3.0]壬 - 5 - 烯丙酸酯（[DBNH][COEt]）中的纤维素壳，对TEMPO氧化纳米纤维素水凝胶进行稳定化处理，以用于干湿法纺丝。在酸性水浴中凝固得到连续的核壳长丝（CSF），其坚韧且柔韧，平均干（和湿）韧性约为11（2）MJ·m，伸长率约为9（14）%。分别使用带有能量色散X射线光谱的扫描电子显微镜、液态核磁共振、傅里叶变换红外光谱、热重分析、热解气相色谱 - 质谱、广角X射线散射和细菌细胞培养来评估CSF的形态、化学成分、热稳定性、结晶度和细菌活性。同轴湿法纺丝产生无PIL的体系，其表面带有纤维素II多晶型物，这不仅提高了长丝的韧性，还便于其功能化。
