Zhao Qian, Zou Weike, Luo Yingwu, Xie Tao
State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
Sci Adv. 2016 Jan 8;2(1):e1501297. doi: 10.1126/sciadv.1501297. eCollection 2016 Jan.
Stimuli-responsive materials with sophisticated yet controllable shape-changing behaviors are highly desirable for real-world device applications. Among various shape-changing materials, the elastic nature of shape memory polymers allows fixation of temporary shapes that can recover on demand, whereas polymers with exchangeable bonds can undergo permanent shape change via plasticity. We integrate the elasticity and plasticity into a single polymer network. Rational molecular design allows these two opposite behaviors to be realized at different temperature ranges without any overlap. By exploring the cumulative nature of the plasticity, we demonstrate easy manipulation of highly complex shapes that is otherwise extremely challenging. The dynamic shape-changing behavior paves a new way for fabricating geometrically complex multifunctional devices.
具有复杂但可控形状变化行为的刺激响应材料对于实际设备应用非常理想。在各种形状变化材料中，形状记忆聚合物的弹性性质允许固定可按需恢复的临时形状，而具有可交换键的聚合物可通过可塑性发生永久形状变化。我们将弹性和可塑性整合到单个聚合物网络中。合理的分子设计使这两种相反的行为能够在不同温度范围内实现，且没有任何重叠。通过探索可塑性的累积性质，我们展示了对高度复杂形状的轻松操纵，否则这将极具挑战性。这种动态形状变化行为为制造几何形状复杂的多功能设备开辟了一条新途径。
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