Title: A Photoorganizable Triple Shape Memory Polymer for Deployable Devices

Author: Jiahao Sun, Bo Peng, Yao Lu, Xiao Zhang, Jia Wei, Chongyu Zhu*, Yanlei Yu

Journal: Small, 2022, 18(9), 2106443

Abstract:

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.

论文链接：https://onlinelibrary.wiley.com/doi/full/10.1002/smll.202106443

PDF下载：A Photoorganizable Triple Shape Memory Polymer for Deployable Devices.pdf

本文章报道了一种由含偶氮苯的热塑性聚氨酯组成的光致三重形状记忆聚合物（POTSMP）。通过引入光开关Tg效应和光热诱导的氢键解离网络，在紫外光和可见光照射下，该POTSMP可任意编程为两个临时形状。另一方面，由于晶体域充当物理交联点，POTSMP在紫外光照射下通过光热效应进行熔融和重结晶过程，在数秒内实现快速光重构和永久形状的原位加工与修复。