Stress-Free Two-Way Shape Memory Effects of Semicrystalline Polymer Networks Enhanced by Self-Nucleated Crystallization,ACS Macro Letters

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Stress-Free Two-Way Shape Memory Effects of Semicrystalline Polymer Networks Enhanced by Self-Nucleated Crystallization
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-08-27 , DOI: 10.1021/acsmacrolett.0c00571
Wenhua Yuan ₁ , Kangkang Liu ₁ , Jian Zhou ₁ , Lingling Ni ₁ , Guorong Shan ₁ , Yongzhong Bao ₁ , Pengju Pan ₁

Affiliation

Stress-free two-way shape memory polymers (2W-SMPs) capable of reversible shifting between two distinct shapes are versatile platforms for the development of future smart devices. However, it is challenging to prepare stress-free 2W-SMPs with good actuation performance and shape programmability from single-component semicrystalline polymers. Herein, we demonstrate a straightforward and universal strategy for preparing 2W-SMPs through self-nucleated crystallization (SNC) of semicrystalline polymers. SNC enables the formation of two types of crystals in the 2W-SMPs, annealed and primary crystals, which function as the skeleton phase and actuation phase, respectively. We achieved a high reversible actuation strain of 17.6% and a good reprogrammability of the SNC-treated polymer networks. Complex shape transformations were obtained, and smart devices were fabricated from the SNC-treated networks by using a locally designed folding and kirigami structure. The SNC strategy provides a generalized approach to improve the 2W-shape memory behavior of semicrystalline polymers.

中文翻译：

自成核结晶增强半结晶聚合物网络的无应力双向形状记忆效应

能够在两种不同形状之间可逆转换的无应力双向形状记忆聚合物 (2W-SMP) 是用于开发未来智能设备的多功能平台。然而，从单组分半结晶聚合物制备具有良好驱动性能和形状可编程性的无应力 2W-SMP 具有挑战性。在此，我们展示了一种通过半结晶聚合物的自成核结晶 (SNC) 制备 2W-SMP 的简单且通用的策略。SNC 能够在 2W-SMP 中形成两种类型的晶体，即退火晶体和初级晶体，它们分别用作骨架相和驱动相。我们实现了 17.6% 的高可逆驱动应变和 SNC 处理的聚合物网络的良好可重编程性。获得了复杂的形状变换，智能设备是通过使用本地设计的折叠和剪纸结构从 SNC 处理的网络制造的。SNC 策略提供了一种通用方法来改善半结晶聚合物的 2W 形状记忆行为。

更新日期：2020-09-15

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