A thermal self-healing polyurethane thermoset based on phenolic urethane
A thermal self-healing polyurethane thermoset based on phenolic urethane
复制标题
基于酚醛聚氨酯的热自修复聚氨酯热固性材料
DOI：
10.1038/pj.2017.48
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发表时间：
2017-11-01
期刊：
影响因子：
2.8
通讯作者：
Huang, Kun
中科院分区：
文献类型：
--
作者：
Cao, Shan;Li, Shouhai;Huang, Kun
热固性聚氨酯具有优良的弹性和耐溶剂性，但成型后不能像热塑性聚合物那样重塑。在本研究中，我们设计了一种基于异氰酸酯和酚羟基之间的可逆反应的热固性聚氨酯，而不是醇羟基。酚醛氨酯在120℃以上部分分解，但降温后酚羟基和异氰酸酯基团重新连接。这些可逆的氨酯键有助于热固性聚氨酯网络的热自修复。这种热固性弹性体在120℃以下是有机不溶的，与原始材料相比，固化后的热固性材料保持了约70%的拉伸强度，并表现出86%的断裂伸长率。这种热固性聚氨酯可应用于自修复涂料或粘合剂。
Thermosetting polyurethanes have excellent elastic properties and solvent resistance, but they cannot be reshaped like thermoplastic polymers after molding. In this study, we designed a thermosetting polyurethane based on a reversible reaction between isocyanates and phenolic hydroxyls instead of alcoholic hydroxyls. The phenolic urethane partially decomposed above 120 C, but the phenolic hydroxyl and isocyanate groups reconnected upon cooling. These reversible urethane bonds contributed to the thermal self-repair of the thermosetting polyurethane network. This thermosetting elastomer was organic-insoluble below 120 C. Compared to the original material, the healed thermoset preserved approximately 70% of its tensile strength and exhibited 86% elongation at break. This thermosetting polyurethane can be applied in self-healing coatings or adhesives.