变形
材料科学
生物
超分子化学
形状记忆聚合物
纳米技术
聚合物
形状记忆合金
机制(生物学)
智能聚合物
智能材料
计算机科学
生物系统
人工智能
复合材料
分子
物理
自然(考古学)
考古
历史
生物
量子力学
作者
Wenjun Peng,Guogao Zhang,Qian Zhao,Tao Xie
标识
DOI:10.1002/adma.202102473
摘要
The diverse morphing behaviors of living creatures arise from their unlimited pathways. In contrast, the equilibrium-driven morphing pathways of common synthetic shape-shifting materials are very limited. For a shape-memory polymer (SMP), its recovery from the temporary shape(s) to the permanent shape typically requires external stimulation and follows a single fixed route. Herein, a covalently crosslinked SMP is designed with ample ureidopyrimidinone (UPy) supramolecular moieties in the network. The UPy units endow the SMP with strong time-temperature dependency, which is explored as a mechanism for spatio-temporal programming of autonomous shape-shifting pathways. In particular, the use of digitally controlled photothermal heating provides versatility in control via an off-equilibrium mechanism. In addition, cooling/heating across its glass transition introduces a locking/unlocking mechanism for its temporal morphing. The benefits of these unique features are demonstrated by multi-shape-transformation, an "invisible"-color-based clock, a time-temperature indicator, and sequence-programmable 4D printing.
科研通智能强力驱动
Strongly Powered by AbleSci AI