State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry , Jilin University , Changchun 130012 , PR China.
ACS Appl Mater Interfaces. 2018 Apr 18;10(15):13073-13081. doi: 10.1021/acsami.8b02124. Epub 2018 Apr 3.
Transparent polymeric films have been successfully integrated with self-healing capabilities. However, these films can only heal damages in the scale of several to several tens of micrometers, thereby greatly limiting their practical applications. The present study reports the fabrication of transparent polymeric films capable of healing millimeter-scale cuts by incorporating hydrogen-bonding units into zwitterionic polymer films, which are cross-linked by electrostatic interactions. The intermolecular interactions in the resulting films are greatly reduced when the films absorb water as a result of the reversibility of hydrogen-bonding and electrostatic interactions, thereby promoting the flowability of the film materials. Thus, the transparent films can heal 7.9 mm wide cuts and recover their damaged transparency following exposure to water. Furthermore, owing to their strong binding affinity to water molecules, the healable transparent films can effectively clean up oil fouled on dry films following rinsing with water. The combination of hydrogen bonding and electrostatic interactions provides a new means of design for transparent films with enhanced healing capabilities and an extended service life.
透明聚合物薄膜已经成功集成了自修复功能。然而，这些薄膜只能修复几到几十微米范围内的损伤，从而极大地限制了它们的实际应用。本研究报告了通过在由静电相互作用交联的两性离子聚合物薄膜中引入氢键单元来制备能够修复毫米级切口的透明聚合物薄膜。当薄膜吸收水分时，氢键和静电相互作用的可逆性会大大降低薄膜中分子间的相互作用，从而提高了薄膜材料的流动性。因此，透明薄膜可以修复 7.9 毫米宽的切口，并在暴露于水后恢复其受损的透明度。此外，由于其与水分子的强结合亲和力，可修复的透明薄膜在用水冲洗后可以有效地清除干燥薄膜上的油污。氢键和静电相互作用的结合为具有增强的修复能力和延长使用寿命的透明薄膜的设计提供了新的手段。
