Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, China.
Small. 2022 Mar;18(9):e2106443. doi: 10.1002/smll.202106443. Epub 2021 Dec 16.
Inspired by the action and healing process from living organisms, developing deployable devices using stimuli-responsive materials, or "smart" deployable devices, is desired to realize remote-controlled programmable deformation with additional in situ repair to perform multiple tasks while extending their service life in aerospace. In this work, a photoorganizable triple shape memory polymer (POTSMP) is reported, which is composed of an azobenzene-containing thermoplastic polyurethane. Upon UV and visible illumination, this POTSMP performs arbitrary programming of two temporary shapes and precise and stepwise shape recovery, exhibiting various temporary shapes adapted to different aerospace applications. On the other hand, rapid light-reconfiguration in seconds, including light-reshaping and light-welding, is achieved in response to UV irradiation, allowing in situ localized process and repair of permanent shape. Combining these photoorganizable operations, deformable devices with complex 2D/3D structures are facilely manufactured with no need of special molds. It is envisioned that this POTSMP can expand the potential of photoresponsive TSMPs in smart deployable devices.
受生物体的运动和愈合过程的启发，开发使用刺激响应材料的可展开装置，或“智能”可展开装置，以实现远程控制的可编程变形，并具有附加的原位修复功能，从而在航空航天领域执行多项任务并延长其使用寿命。在这项工作中，报道了一种光可聚合的三重形状记忆聚合物（POTSMP），它由含偶氮苯的热塑性聚氨酯组成。在 UV 和可见光照射下，该 POTSMP 可以任意编程两个临时形状，并精确地逐步恢复形状，表现出各种临时形状，以适应不同的航空航天应用。另一方面，通过 UV 照射可以在几秒钟内实现快速的光重配置，包括光整形和光焊接，从而可以对永久形状进行原位局部处理和修复。通过结合这些光可操作的方法，可以轻松制造具有复杂 2D/3D 结构的可变形装置，而无需特殊模具。可以预见，这种 POTSMP 可以扩展光响应 TSMP 在智能可展开装置中的潜力。
