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首页> 外文期刊>Polymers for advanced technologies >Poly(carbonate-urea-urethane) networks exhibiting high-strain shape-memory effect
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Poly(carbonate-urea-urethane) networks exhibiting high-strain shape-memory effect

机译：聚（碳酸脲 - 氨基甲酸酯）网络表现出高菌株形状记忆效应

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A challenge in the design of shape-memory polymers (SMPs) is to achieve high deformability with a simultaneous high shape recovery ratio. Here we explored, whether SMPs featuring large deformation capability and high shape recovery ratios can be created as polymer networks providing two kinds of netpoints based on covalent bonds and physical interactions. As a model system, we selected poly(carbonate-urea-urethane)s (PCUUs) synthesized by a precursor route, based on oligo(alkylene carbonate) diols, isophorone diisocyanate (IPDI), and water vapor. The PCUU networks exhibited a one-way shape-memory effect (1W-SME) with programmed strains up to epsilon(prog)=1000% whereby they provided excellent shape fixity (92-97%) and shape recovery (99%) ratios. The switching temperatures (T-sw) varied between 36 and 65 degrees C and increased with the increasing molecular weight of the oligo(alkylene carbonate) diol and length of the hydrocarbon chain between the carbonate linkages. T-sw was also influenced by the strain applied during programming (epsilon(prog)). Poly(carbonate-urethane)s have been reported to have good biocompatibility and biostability, which in the combination of high-strain capacity and high Young's modulus makes the obtained PCUUs interesting candidate materials suitable for medical devices such as medical sutures or vascular stents. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：形状记忆聚合物（SMPS）设计中的挑战是以同时高形状回收率实现高变形性。在这里，我们探讨了是否可以创建具有大变形能力和高形状恢复比的SMPS以聚合物网络创建为提供两种基于共价键和物理相互作用的基点。作为模型系统，我们选择通过前体途径合成的聚（碳酸脲 - 氨基甲酸酯）S（PCUUS），基于寡核苷酸（碳酸亚替代亚烷基酯）二醇，异佛酮二异氰酸酯（IPDI）和水蒸气。 PCUU网络表现出一种单向形状记忆效果（1W-SME），其编程菌株直到ε（PROG）= 1000％，从而提供优异的形状固定性（92-97％）和形状回收率（99％）比率。切换温度（T-SW）在36和65摄氏度之间变化，随着碳酸酯键在碳酸酯键之间的烃基二醇的增加和烃链的长度而增加。 T-SW也受到编程期间施加的应变的影响（epsilon（prog））。据报道，聚（碳酸酯 - 氨基甲酸酯）S具有良好的生物相容性和生物稳定性，其在高度应变能力和高杨氏模量的组合中，使得获得的PCUUS有趣的候选材料适用于医用缝合线或血管支架。版权所有（c）2016 John Wiley＆Sons，Ltd。

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