Division of Semiconductor and Chemical Engineering, Chonbuk National University, Baekjedaero 567, Deokjin-gu, Jeonju, Chonbuk 54896, Korea.
Molecules. 2019 Apr 16;24(8):1492. doi: 10.3390/molecules24081492.
In this study, environmentally friendly, self-healing waterborne polyurethanes (WPUs) were prepared based on the disulfide metathesis reaction in cystamine. The cystamine acted as a chain extender in the WPU film, which showed a high mechanical strength of 19.1 MPa. The possibility of self-healing reaction was simultaneously modeled via liquid chromatography-mass spectrometry (LC-MS). WPU was confirmed to self-heal a surface crack thermally after a scratch test, and the efficiency was measured by comparing the mechanical properties before and after a cut-and-healing test. In addition, the disulfide-thiol exchange reaction was confirmed to occur in WPU with cystamine as a chain extender and 2-mercaptoethanol. Hot press tests confirmed the possibility of reprocessing the WPU. The WPU incorporating disulfide groups showed great potential as a smart self-healing material.
在这项研究中，基于胱胺中的二硫键交换反应，制备了环保、自修复的水性聚氨酯（WPUs）。胱胺作为 WPUs 薄膜中的扩链剂，表现出 19.1 MPa 的高机械强度。通过液相色谱-质谱联用（LC-MS）对自修复反应的可能性进行了模拟。在划痕测试后，WPUs 被证实可以通过热自修复表面裂纹，通过比较切割和修复前后的力学性能来测量效率。此外，用胱胺作为扩链剂和 2-巯基乙醇的 WPUs 中确认发生了二硫键-硫醇交换反应。热压测试证实了 WPUs 再加工的可能性。含有二硫键的 WPUs 作为一种智能自修复材料具有很大的潜力。
