Catalyst-Free Thermoset Polyurethane with Permanent Shape Reconfigurability and Highly Tunable Triple-Shape Memory Performance.
Catalyst-Free Thermoset Polyurethane with Permanent Shape Reconfigurability and Highly Tunable Triple-Shape Memory Performance.
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DOI：
10.1021/acsmacrolett.7b00037
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发表时间：
2017-03
影响因子：
5.8
通讯作者：
Ning Zheng;Jingjing Hou;Yang Xu;Zizheng Fang;Weike Zou;Qian Zhao;Tao Xie
中科院分区：
文献类型：
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作者：
Ning Zheng;Jingjing Hou;Yang Xu;Zizheng Fang;Weike Zou;Qian Zhao;Tao Xie
热固性形状记忆聚合物（SMP）是一类具有动态共价键网络的新型形状记忆聚合物，其永久形状可以通过拓扑重排（塑性）来重新配置。催化氨基甲酰基化最近被确定为交联聚氨酯网络中塑性的有效交换反应。然而，确保可塑性严重限制了网络设计，从而对实际应用中调整其他经典形状记忆特性的能力产生不利影响。面对这一新的挑战，我们设计了一种交联密度可在大范围内调节的非晶聚氨酯体系。我们发现，在合成聚氨酯时使用芳香族二异氰酸酯有助于在不需要任何催化剂的情况下实现塑性。整体网络设计可在不牺牲塑性的情况下实现可调的恢复应力和形状记忆转变温度。聚氨酯SMP的多功能性进一步体现在其三形状记忆性能上。我们预计，我们的可调聚氨酯将有利于各种潜在的SMP设备的应用。
Thermoset shape memory polymer (SMP) with dynamic covalent bonds in the network is a new class of SMPs for which the permanent shape can be reconfigured via topological rearrangement (plasticity). Catalyzed transcarbamoylation has recently been established as an effective exchange reaction for plasticity in cross-linked polyurethane networks. However, ensuring the plasticity severely constrains the network design which adversely affects the ability to tune other classical shape memory properties for practical applications. Facing this new challenge, we design an amorphous polyurethane system for which the cross-linking density can be adjusted in a wide range. We discovered that the use of an aromatic diisocyanate in the synthesis of the polyurethanes facilitates achieving plasticity without requiring any catalyst. The overall network design leads to tunable recovery stress and shape memory transition temperatures without sacrificing the plasticity. The versatility of our polyurethane SMP is further reflected in its triple-shape memory performance. We anticipate that our tunable polyurethanes will benefit a variety of potential SMP device applications.