室温快速自修复超疏水聚硅氧烷涂层制备及其自修复自清洁性能

Preparation of Superhydrophobic Polysiloxane Coating of Ultrafast Self-healing at Room Temperature and Its Self-healing and Self-cleaning Performance

赋予超疏水材料自修复的能力,可以改善材料性能,延长服役时间。将可逆动态亚胺键引入聚硅氧烷基体,制备了室温快速自修复的自清洁超疏水涂层。涂层的接触角154°,滚动角5°,在O_(2)等离子体刻蚀至表面接触角为0°之后,室温修复1 h即可快速恢复超疏水特性,经6次损伤-修复循环后接触角依旧保持在150°以上。升高温度到80℃或者利用碳纳米管的光热效应还可实现涂层化学损伤10~20 min的超快修复。研究表明,构建100 nm/10μm微纳粗糙表面可赋予涂层超疏水特性,可逆动态亚胺键交换重组的化学修复与柔性分子链段运动翻转的物理修复共同作用是实现涂层室温快速自修复的关键。

Designing and preparing superhydrophobic materials with self-healing ability can improve material properties and prolong service time.The reversible dynamic imine bond is introduced into the polysiloxane matrix to prepare a rapid self-healing and self-cleaning superhydrophobic coating at room temperature.The contact angle of the coating is 154°,and the rolling angle is 5°.After the contact angle of the coating is reduced to 0 due to the etching of O_(2) plasma,its superhydrophobic property can be restored when it is placed at room temperature for 1 hour.After 6 damage and repair cycles,its contact angle remains above 150°.The coating chemical damage can be repaired in 10-20 min by increasing the ambient temperature to 80℃or using the photothermal effect of carbon nanotubes.Studies show that the construction of a rough surface of 100 nm/10μm can make the coating have superhydrophobic properties.The chemical repair principle of reversible dynamic imine bond exchange and recombination and the physical repair principle of flexible molecular chain segment movement are synergistic,which is the key to rapid coating repair at room temperature.