Thermoset Shape-Memory Polyurethane with Intrinsic Plasticity Enabled by Transcarbamoylation
作者:Ning Zheng、Zizheng Fang、Weike Zou、Qian Zhao、Tao Xie
DOI:10.1002/anie.201602847
日期:2016.9.12
classical thermoset shape‐memory polyurethane is readily capable of permanent reshaping (plasticity) after a topological network rearrangement that is induced by transcarbamoylation. By employing the Jianzhi technique (also known as kirigami), unexpected shape‐shifting versatility was observed for this otherwise classical material. As the essential carbamate moiety in polyurethanes is one of the most common
热固性聚合物以其优异的热机械性能而闻名,但化学交联通常会导致难处理性。这反映在热固性和热塑性形状记忆聚合物之间的巨大差异。前者具有强大的形状记忆能力,但无法重新定义永久形状。与目前的知识相反,我们在这里揭示了经典的热固性形状记忆聚氨酯在通过转氨甲酰化反应引起的拓扑网络重排后,很容易永久变形(可塑性)。通过使用Jianzhi技术(也称为kirigami),对于这种原本经典的材料,观察到了意想不到的形状转换多功能性。由于聚氨酯中必需的氨基甲酸酯部分是最常见的聚合物构建单元之一,