Smart shape-memory polymers can memorize and recover their permanent shape in response to an external stimulus (for example, heat). They have been extensively exploited for a wide spectrum of applications ranging from biomedical devices to aerospace morphing structures. However, most of the existing shape-memory polymers are thermoresponsive and their performance is hindered by heat-demanding programming and recovery steps. Although pressure is an easily adjustable process variable such as temperature, pressure-responsive shape-memory polymers are largely unexplored. Here we report a series of shape-memory polymers that enable unusual 'cold' programming and instantaneous shape recovery triggered by applying a contact pressure at ambient conditions. Moreover, the interdisciplinary integration of scientific principles drawn from two disparate fields--the fast-growing photonic crystal and shape-memory polymer technologies--enables fabrication of reconfigurable photonic crystals and simultaneously provides a simple and sensitive optical technique for investigating the intriguing shape-memory effects at nanoscale.

中文翻译：

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通过压力响应形状记忆聚合物实现可重构光子晶体。

智能的形状记忆聚合物可以响应外部刺激（例如热量）记忆并恢复其永久形状。它们已被广泛地开发用于从生物医学设备到航空航天变形结构的广泛应用。然而，大多数现有的形状记忆聚合物是热响应性的，并且其性能受到热要求的编程和恢复步骤的阻碍。尽管压力是一个易于调节的过程变量，例如温度，但是压力响应型形状记忆聚合物在很大程度上尚未得到开发。在这里，我们报告了一系列形状记忆聚合物，这些聚合物能够通过在环境条件下施加接触压力来实现异常的“冷”编程和瞬时形状恢复。而且，