Since the discovery of MXene, which has been attracting attention as an alluring two-dimensional material with a distinct structure and mechanical and electrical capabilities, numerous attempts have been made to combine MXene with polymer additives to enhance and compensate for MXene’s inherent weakness. In this work, the rheological properties of MXene (Ti₃C₂T_x)-polymer composite inks of three different polymers with various interaction with MXene particles are examined. Polyethylene glycol (PEG), which is known to physically adsorb on the surface of MXene, improved MXene dispersion while enhancing the viscoelastic property of ink. MXene ink containing polyethylenimine (PEI) was destabilized forming a viscoelastic network structure as PEI of strong positive charge adsorbed on the MXene surface to neutralize negative charge and diminish electrostatic repulsion. In the case of MXene-polyacrylic acid (PAA) composite ink, the formation of hydrogen bonds between MXene and PAA resulted in a dense network structure with high viscoelasticity. In terms of rheological property sensitivity to concentration, MXene ink without polymer additives exhibited power-law behavior with the largest exponent, whereas MXene-polymer composite inks indicated moderate sensitivity. Our findings will aid in the design of MXene-based composites with optimum rheological properties for specific processes such as 3D printing and coating.

自从发现 MXene 以来，它作为一种具有独特结构和机械和电气性能的诱人二维材料而备受关注，人们进行了许多尝试，将 MXene 与聚合物添加剂结合起来，以增强和弥补 MXene 的固有弱点。在这项工作中，MXene (Ti ₃ C ₂ T _x)-聚合物复合油墨的三种不同聚合物与 MXene 颗粒具有不同的相互作用。已知物理吸附在 MXene 表面的聚乙二醇 (PEG) 改善了 MXene 的分散性，同时增强了墨水的粘弹性。含有聚乙烯亚胺 (PEI) 的 MXene 墨水不稳定，形成粘弹性网络结构，因为强正电荷的 PEI 吸附在 MXene 表面以中和负电荷并减少静电排斥。在 MXene-聚丙烯酸 (PAA) 复合油墨的情况下，MXene 和 PAA 之间氢键的形成导致具有高粘弹性的致密网络结构。就流变特性对浓度的敏感性而言，不含聚合物添加剂的 MXene 墨水表现出指数最大的幂律行为，而 MXene-聚合物复合油墨表现出中等敏感性。我们的发现将有助于设计具有最佳流变性能的 MXene 基复合材料，适用于 3D 打印和涂层等特定工艺。