Yi Chen,Xing Zhao,Chen Luo,Yan Shao,Ming-Bo Yang,Bo Yin
Despite tremendous advances in the preparation of smart materials, it remains a great challenge to integrate shape memory and self-healing properties into one material system, which have received increasing interests because of their many potential applications. Herein, the PCL/TPU blends are prepared as shape memory matrix by simple solution blending. Then the polydopamine (PDA) nanospheres acted as photothermal fillers were incorporated into PCL/TPU blends which enables the system to exhibit excellent light-response shape memory effect with a shape recovery ratio of 100%. Besides, the nanocomposites also own good self-healing performance because of the microporous structure. The surface crack can be healed in 150 s under light irradiation, and the healing efficiency can reach 78.53%. Therefore, the fast light-response shape memory effect and rapidly self-healing property, along with the facile fabrication processes, make PCL/TPU/PDA nanocomposites ideal for a variety of applications, such as biomedical microdevices, artificial muscles and soft robotics.
Yi Chen,Xing Zhao,Yan Li,Zhao-Yuan Jin,Yi Yang,Ming-Bo Yang,Bo Yin
Stimuli-responsive intelligent biomimetic materials are promoting the development of soft robotics. Despite tremendous advances in stimuli-responsive intelligent materials, it is still a challenge to design facile methods to integrate multifunctional features, including multiple-stimulus responsive ability, shape reconfiguration, reversible shape transformation and self-healing performance, into a single material system, which is an emerging interest and will greatly advance the field of intelligent bionic soft robotics. Herein, a novel multiple-stimulus responsive shape memory polymer based on biocompatible PCL/TPU/Fe3O4@PDA nanocomposites is developed by a facile and universal fabrication method. The nanocomposite film shows fast light- and magnetic-responsive ability (magnetic field: 1 s; light: 5 s). The temporary shape obtained by the combination of photothermal heating and magnetic-responsive actuation can be locked by turning off the light and magnetic field. Subsequent light illumination without the magnetic field can activate the material and drive the recovery of the initial shape. Thus, the resulting intelligent material presents shape reconfiguration and reversible shape transformation by a light and magnetic synergy response. In addition, the material exhibits excellent and repeatable shape memory assisted self-healing performance, the surface crack can be self-healed under light illumination (in 120 s), and the self-healing efficiency can reach 90.0%. Therefore, this intelligent shape memory polymer nanocomposite with its multifunctional features has great potential for advanced soft robotics in a plethora of fields, such as biomedical devices, artificial muscles, smart actuators and aerospace.
危险品化学品经营许可证（带存储）