Sanaka Rajita, Sahu Santosh Kumar
School of Mechanical Engineering, VIT-AP University, Besides A.P. Secretariat, Amaravati 522237, Andhra Pradesh, India.
Heliyon. 2024 Jan 4;10(2):e24014. doi: 10.1016/j.heliyon.2024.e24014. eCollection 2024 Jan 30.
This research presents an experimental investigation into the mechanical, thermal, and shape memory behavior of a thermos-responsive polyurethane (PU) reinforced with 0-1.0 wt % of MXene (TiCT) nanofiller. The PU/MXene nanocomposites were fabricated using sonication and injection molding route. The 0.5 wt % PU/MXene nanocomposite showed the optimum mechanical properties i.e. tensile modulus, tensile strength, and hardness value, which are improved by 22, 281, and 19 %, respectively, compared to pure PU. The improvement is observed in melting temperature (T), the heat of melting (h), crystallization temperature (T), and the heat of crystallization (h) results. The percentage of crystallinity revealed enhancements of 6 %, 18 %, 24 %, and 34 % for 0.1, 0.2, 0.3, and 0.5 wt % PU/MXene samples respectively compared to pure PU. The findings from the shape recovery experiments demonstrated that the inclusion of MXene has no impact on both the shape fixity and shape recovery performance. The PU/MXene nanocomposite with improved mechanical and thermal properties can find potential applications in robotics actuators, medical devices, sensors, etc.
本研究对添加0 - 1.0 wt%的MXene（TiCT）纳米填料增强的热响应性聚氨酯（PU）的力学、热学和形状记忆行为进行了实验研究。采用超声处理和注塑成型工艺制备了PU/MXene纳米复合材料。0.5 wt%的PU/MXene纳米复合材料表现出最佳的力学性能，即拉伸模量、拉伸强度和硬度值，与纯PU相比，分别提高了22%、281%和19%。在熔点（T）、熔化热（h）、结晶温度（T）和结晶热（h）结果中也观察到了这种改善。与纯PU相比，0.1、0.2、0.3和0.5 wt%的PU/MXene样品的结晶度百分比分别提高了6%、18%、24%和34%。形状恢复实验的结果表明，MXene的加入对形状固定率和形状恢复性能均无影响。具有改善的力学和热学性能的PU/MXene纳米复合材料可在机器人致动器、医疗设备、传感器等领域找到潜在应用。
