Shape‐memory polymers (SMPs) possess the capability to change shapes upon stimulation; however, the programming process that determines the temporary shape cannot proceed without external manipulation, which may greatly affect the shape complexity, accuracy, and reproducibility. Here, an automatically programmable SMP (AP‐SMP) based on asymmetric swelling of bilayer SMP structures is demonstrated without external manipulation. In the automatic programming process, the AP‐SMP can be deformed by the swelling of its hydrophilic hinge film in warm water to a temporary shape, which could be fixed by the glass transition of the two SMP films through cooling and drying in air. Owing to the unique ability, many complex shapes can be easily customized through diverse design strategies. Moreover, the AP‐SMPs can reversibly transform between the permanent and temporary shapes, and both shapes are free‐standing in normal conditions. The automatic programming of AP‐SMPs may greatly expand the potential application range of SMPs.

中文翻译：

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基于双层结构不对称膨胀的可自动编程的形状记忆聚合物

形状记忆聚合物（SMP）具有在刺激时改变形状的能力；但是，如果没有外部操作，确定临时形状的编程过程将无法进行，这可能会极大地影响形状的复杂性，准确性和可重复性。在此演示了基于双层SMP结构不对称膨胀的自动可编程SMP（AP-SMP），无需外部操作。在自动编程过程中，AP‐SMP会因其亲水性铰链膜在温水中溶胀成临时形状而变形，这可以通过在空气中冷却和干燥两个SMP膜的玻璃化转变来固定。由于具有独特的功能，可以通过多种设计策略轻松定制许多复杂的形状。而且，AP-SMP可以在永久形状和临时形状之间可逆地转换，并且两种形状在正常情况下都是独立的。AP-SMP的自动编程可能会大大扩展SMP的潜在应用范围。