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首页> 外文期刊>ACS applied materials & interfaces >External Stress-Free Reversible Multiple Shape Memory Polymers
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External Stress-Free Reversible Multiple Shape Memory Polymers

机译：外部压力可逆多个形状记忆聚合物

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摘要

The present work is focused on developing external stress-free two-way triple shape memory polymers (SMPs). Accordingly, a series of innovative approaches are proposed for the material design and preparation. Polyurethane prepolymers carrying crystalline polytetrahydrofuran (PTMEG) and poly(epsilon-caprolactone) (PCL) as the switching phases are respectively synthesized in advance and then cross-linked to produce the target material. The stepwise method is believed to be conducive to manipulation of the relative contribution of PCL and PTMEG. Moreover, the chain extender, 2-amino-5-(2-hydroxyethyl)-6-methylpyrimidin-4-ol (UPy), is incorporated to establish hydrogen bonds among the macromolecules. By straightforward stretching treatment at different temperatures, the hydrogen bond networks are successfully converted into an internal stress provider, which overcomes the challenge of stress relaxation of the melted low melting temperature polymer (i.e., PTMEG) and increases the efficiency of stress transfer. Meanwhile, the contraction force of the switching phases is tuned to match the internal tensile stress. As a result, the internal stress provider can closely collaborate with melting/recrystallization of the crystalline domains, leading to the repeated multiple shape memory effects. The cross-linked polyurethane is thus able to reversibly morph among three shapes and displays its potentials as soft robot and actuator. The strategy reported here has the advantages of easily accessible raw materials, simple reaction, and facile programing/deprograming/reprograming, so that it possesses wide applicability.
机译：本工作的重点是开发出外部压力双向三重形状记忆聚合物（SMPS）。因此，提出了一系列创新方法，用于材料设计和制备。携带结晶聚四氢呋喃（PTMEG）和聚（ε-己内酯）（PCL）作为切换相的聚氨酯预聚物分别预先合成，然后交联以产生靶材料。据信逐步方法有利于操纵PCL和PTMEG的相对贡献。此外，掺入了链增量剂2-氨基-5-（2-羟基乙基）-6-甲基吡啶蛋白-4-醇（UPY），以在大分子中建立氢键。通过在不同温度下的直接拉伸处理，氢键网络成功转换成内部应力提供者，其克服了熔融的低熔点温度聚合物（即PTMEG）的应力松弛挑战并增加了应力转移的效率。同时，调谐切换相的收缩力以匹配内部拉伸应力。结果，内部应力提供者可以密切合作结晶域的熔化/再结晶，导致重复的多重形状记忆效应。因此，交联聚氨酯能够在三个形状中可逆地变形，并显示其作为软机器人和致动器的电位。这里报告的策略具有易于使用的原材料，简单的反应和舒适的编程/贬值/重新编程的优点，使其具有广泛的适用性。

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