Abstract Highlighting enhanced properties of polymers provided by dual-curing, self-healing coatings have been prepared via Diels-Alder and urethane formation reactions. These two orthogonal reactions were performed by functionalization of hydroxyl-terminated polybutadiene with furan dangling groups through thiol-ene reaction. In other words, the presence of the furan groups along with the terminal hydroxyl groups of HTPB made it possible to undergo in both urethane formation and Diels-Alder cycloaddition reactions, simultaneously. Remarking the effect of the Diels-Alder reaction on the self-healing ability of the samples, the proper bismaleimide compound has been selected by the DSC test. Moreover, a novel tetrafuran compound has been synthesized as crosslinking agent to improve the mechanical strength of the prepared coating and their self-healing properties. Evaluating the microscopic and macroscopic scales showed that the prepared coatings exhibited good healing properties as well as their mechanical properties. The microscopic imaging confirmed that the created scratches vanished after the healing process in all samples. Furthermore, the healed samples were displayed at least 50 % of their initial strength in the tensile test. Additionally, the results revealed that the coatings mechanical strength was reinforced from 1.34 to 2.30 MPa by introducing tetrafuran crosslinking agent in their matrix.

中文翻译：

---

正交反应制备的自修复双固化聚氨酯弹性体涂料

摘要 通过 Diels-Alder 和氨基甲酸酯形成反应制备了双固化、自修复涂层，从而增强了聚合物的性能。这两个正交反应是通过硫醇-烯反应使带有呋喃悬空基团的羟基封端的聚丁二烯官能化来进行的。换句话说，呋喃基团与 HTPB 的末端羟基的存在使得可以同时进行氨基甲酸酯的形成和狄尔斯-阿尔德环加成反应。注意到Diels-Alder反应对样品自愈能力的影响，通过DSC测试选择了合适的双马来酰亚胺化合物。而且，合成了一种新型四呋喃化合物作为交联剂，以提高所制备涂层的机械强度及其自修复性能。评估微观和宏观尺度表明制备的涂层表现出良好的愈合性能以及它们的机械性能。显微成像证实，所有样品在愈合过程后产生的划痕都消失了。此外，在拉伸试验中，愈合后的样品显示出其初始强度的至少 50%。此外，结果表明，通过在基体中引入四呋喃交联剂，涂层的机械强度从 1.34 MPa 提高到 2.30 MPa。评估微观和宏观尺度表明制备的涂层表现出良好的愈合性能以及它们的机械性能。显微成像证实，所有样品在愈合过程后产生的划痕都消失了。此外，在拉伸试验中，愈合后的样品显示出其初始强度的至少 50%。此外，结果表明，通过在基体中引入四呋喃交联剂，涂层的机械强度从 1.34 MPa 提高到 2.30 MPa。评估微观和宏观尺度表明制备的涂层表现出良好的愈合性能以及它们的机械性能。显微成像证实，所有样品在愈合过程后产生的划痕都消失了。此外，在拉伸试验中，愈合后的样品显示出其初始强度的至少 50%。此外，结果表明，通过在基体中引入四呋喃交联剂，涂层的机械强度从 1.34 MPa 提高到 2.30 MPa。