Ti3C2Tx/聚酰亚胺复合材料的制备及性能

为了改善聚酰亚胺（PI）的热学性能和冲击断裂强度、弯曲强度和硬度等力学性能，通过液相刻蚀三元层状陶瓷Ti₃AlC₂制备了二维层状结构纳米Ti₃C₂T_x，利用XRD、FE-SEM对产物进行了物相分析和微观结构表征；采用湿法球磨和热压成型法制备了不同Ti₃C₂T_x含量的Ti₃C₂T_x/PI复合材料，考察了Ti₃C₂T_x对复合材料热学性能、冲击断裂强度、弯曲强度和硬度等的影响，并分析了断面形貌。结果表明，所制备的Ti₃C₂T_x为纳米片层结构，片层厚度为20~50 nm，片层堆叠；二维Ti₃C₂T_x在PI基体中分散均匀，且固化过程中PI进入Ti₃C₂T_x层间提高了二者之间的结合力，使界面结合良好；Ti₃C₂T_x纳米片的添加提高了PI的玻璃化转变温度并改善了基体的冲击断裂强度、弯曲强度和硬度等，当Ti₃C₂T_x添加量为0.25wt%时，Ti₃C₂T_x/PI复合材料的玻璃化转变温度提高了17℃，冲击断裂强度提高了31%。

Preparation and performances of Ti3C2Tx/polyimide composites

In order to improve the thermal properties and impact rupture strength, flexural strength and hardness et al mechanical properties of polyimide (PI), two-dimensional layered structure nanomaterial Ti₃C₂T_x was prepared by liquid-phase etching of a ternary layered ceramic Ti₃AlC₂. The crystal structure and morphology of as-prepared were characterized by XRD and FESEM. The Ti₃C₂T_x/PI composites with different concentrations of Ti₃C₂T_x were prepared by wet ball milling and hot pressing. The effects of Ti₃C₂T_x on the thermal properties, impact rupture strength, flexural strength and hardness of Ti₃C₂T_x/PI composites were investigated. Simultaneously, the fracture morphology was analyzed. The results suggest that Ti₃C₂T_x with a thickness of 20-50 nm is nanosheets layered structure, which can uniformly disperse in the PI matrix. During the curing process, PI enters the Ti₃C₂T_x layers and improves the bonding force between PI and Ti₃C₂T_x, resulting in good combining interface. The addition of Ti₃C₂T_x nanosheets enhance the glass transition temperature of PI and improve the impact rupture strength, flexural strength, and hardness properties of the matrix. When adding amount of Ti₃C₂T_x is 0.25wt%, the glass transition temperature of Ti₃C₂T_x/PI composite increases by 17℃ and the impact rupture strength ascends by 31%.