MXene is a new two-dimensional transition metal carbide/nitride with remarkable hydrophilicity, which has been widely applied in multifunctional coatings. In this study, Ti₃C₂T_x MXene was synthesized by LiF/HCl solution etching of Ti₃AlC₂ and used to modify the surface of polyethylene (PE) fiber, enhancing the interfacial properties between fiber and matrix and further improving the tensile properties of strain hardening cementitious composites (SHCC). The tensile stress and strain of SHCC incorporating the MXene-coated PE (MXene@PE) fiber increased by 18.73 % and 93.60 %, respectively, accompanied by reduced crack width and crack spacing. Single fiber pullout results showed that the frictional bond strength increased by 71.35 % due to the strong chemical bond between fiber and matrix. The microstructure of MXene@PE fiber and bonding properties were characterized by SEM/EDS, FTIR, and XPS. The MXene was proved to have a dual effect of bonding to PE fiber and to C–S–H via covalent and hydrogen bonds.

MXene是一种新型二维过渡金属碳化物/氮化物，具有显着的亲水性，在多功能涂料中得到了广泛的应用。本研究通过_{LiF/HCl溶液蚀刻Ti 3} AlC ₂合成了_{Ti 3} C ₂ T _{x MXene} ，并用于对聚乙烯（PE）纤维进行表面改性，增强纤维与基体之间的界面性能，进一步提高拉伸性能应变硬化水泥基复合材料（SHCC）的性能。含有 MXene 涂层 PE (MXene@PE) 纤维的 SHCC 的拉伸应力和应变分别增加了 18.73% 和 93.60%，同时裂纹宽度和裂纹间距减小。单纤维拔出结果表明，由于纤维与基体之间存在较强的化学键，摩擦结合强度提高了71.35%。通过SEM/EDS、FTIR和XPS对MXene@PE纤维的微观结构和粘合性能进行了表征。MXene 被证明具有通过共价键和氢键与 PE 纤维和 C-S-H 结合的双重作用。