Smirnov Michael A, Fedotova Veronika S, Sokolova Maria P, Nikolaeva Alexandra L, Elokhovsky Vladimir Yu, Karttunen Mikko
Institute of Macromolecular Compounds, Russian Academy of Sciences, V.O. Bolshoi pr. 31, 199004 St. Petersburg, Russia.
Institute of Chemistry, Saint Petersburg State University, Universitetsky pr. 26, Peterhof, 198504 St. Petersburg, Russia.
Polymers (Basel). 2021 Sep 9;13(18):3044. doi: 10.3390/polym13183044.
In this work, a novel approach is demonstrated for 3D-printing of bacterial cellulose (BC) reinforced UV-curable ion gels using two-component solvents based on 1-butyl-3-methylimidazolium chloride or choline chloride combined with acrylic acid. Preservation of cellulose's crystalline and nanofibrous structure is demonstrated using wide-angle X-ray diffraction (WAXD) and atomic force microscopy (AFM). Rheological measurements reveal that cholinium-based systems, in comparison with imidazolium-based ones, are characterised with lower viscosity at low shear rates and improved stability against phase separation at high shear rates. Grafting of poly(acrylic acid) onto the surfaces of cellulose nanofibers during UV-induced polymerization of acrylic acid results in higher elongation at break for choline chloride-based compositions: 175% in comparison with 94% for imidazolium-based systems as well as enhanced mechanical properties in compression mode. As a result, cholinium-based BC ion gels containing acrylic acid can be considered as more suitable for 3D-printing of objects with improved mechanical properties due to increased dispersion stability and filler/matrix interaction.
在这项工作中，展示了一种新颖的方法，用于使用基于1-丁基-3-甲基咪唑氯化物或氯化胆碱与丙烯酸的双组分溶剂对细菌纤维素（BC）增强的紫外光固化离子凝胶进行3D打印。使用广角X射线衍射（WAXD）和原子力显微镜（AFM）证明了纤维素的晶体和纳米纤维结构得以保留。流变学测量表明，与基于咪唑鎓的体系相比，基于胆碱鎓的体系在低剪切速率下具有较低的粘度，在高剪切速率下具有更好的抗相分离稳定性。在丙烯酸的紫外诱导聚合过程中，聚丙烯酸接枝到纤维素纳米纤维表面，使得基于氯化胆碱的组合物的断裂伸长率更高：为175%，而基于咪唑鎓的体系为94%，并且在压缩模式下机械性能增强。因此，由于分散稳定性和填料/基体相互作用增加，含丙烯酸的基于胆碱鎓的BC离子凝胶可被认为更适合用于3D打印具有改善机械性能的物体。
