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Autonomous Off-Equilibrium Morphing Pathways of a Supramolecular Shape-Memory Polymer

机译：超分子形状记忆聚合物的自主越偏平变形途径

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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.
机译：生活生物的多样性变形行为来自他们无限的途径。相反，普通合成形状移位材料的平衡驱动的变形途径非常有限。对于形状记忆聚合物（SMP），其从临时形状到永久形状的恢复通常需要外部刺激并遵循单个固定路线。这里，共价交联的SMP设计有网络中的富脲嘧啶酮（Upy）超分子部分。 UPY单位赋予SMP具有强的时间温度依赖性，这被探索为自主形状移位途径的时空编程的机制。特别地，使用数字控制的光热加热通过偏离平衡机构提供了可控制的通用性。此外，横跨其玻璃化转换的冷却/加热引入了锁定/解锁机构，以便其时间变形。这些独特特征的益处是通过多形式转换，“无形” - 基于色彩的时钟，时间温度指示器和序列可编程4D打印的益处。

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  • 来源
    《Advanced Materials》 |2021年第34期|2102473.1-2102473.8|共8页
  • 作者

    Peng Wenjun; Zhang Guogao; Zhao Qian; Xie Tao;

  • 作者单位

    Zhejiang Univ Coll Chem & Biol Engn State Key Lab Chem Engn Hangzhou 310027 Peoples R China;

    Zhejiang Univ Coll Chem & Biol Engn State Key Lab Chem Engn Hangzhou 310027 Peoples R China;

    Zhejiang Univ Coll Chem & Biol Engn State Key Lab Chem Engn Hangzhou 310027 Peoples R China|ZJU Hangzhou Global Sci & Technol Innovat Ctr Hangzhou 311215 Peoples R China;

    Zhejiang Univ Coll Chem & Biol Engn State Key Lab Chem Engn Hangzhou 310027 Peoples R China|ZJU Hangzhou Global Sci & Technol Innovat Ctr Hangzhou 311215 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    4D printing; shape-memory polymers; supramolecular bonds; time-temperature indicators; ureidopyrimidinone;

    机译：4D打印;形状记忆聚合物;超分子键;时间温度指标;00Reidopymidinone;

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