Wu Cong, Yin Bing, Wang Pan, Chen Jizhou, Zhang Yongmin, Feng Haibao, Pang Kai, Hou Dongshuai
School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China.
Qingdao Municipal Group Co., Ltd., Qingdao 266001, China.
ACS Appl Mater Interfaces. 2024 Jul 31;16(30):39952-39968. doi: 10.1021/acsami.4c06288. Epub 2024 Jul 16.
The durability of concrete structures can be enhanced in a convenient and permanent manner through the surface protection of cementitious materials with composite polymer coatings. However, polymer coatings are susceptible to various mechanical and physical deterioration in complex and variable environments. In this paper, the theory of polymer microstructure regulation was employed to improve the sustainability of the protective performance of composite coatings. The self-assembled core-shell structure regulated by amphiphilic Janus nanoparticles is employed to modify the tunable polystyrene acrylate-polysiloxane self-healing coatings. The results demonstrate that the adhesion strength of the prepared self-assembled coating reached 3.7 MPa, which is sufficient to resist the damage to the microstructure of cementitious materials caused by physical erosion, seepage, and ionic corrosion. The self-healing coating, regulated by Janus particles, exhibited a residual creep of only 57.03% and a maximum loss angle tangent of 0.381. Furthermore, the material exhibited a superior shape memory function due to the presence of strong hydrogen bonding. The regulated self-healing coating repaired the polymer structural damage under mechanical and thermal deformation by bridging and filling effects. The coating demonstrated a tensile strength recovery of up to 71.23% in a wetted state, accompanied by a rapid restoration of its electrochemical properties and corrosion resistance. Furthermore, the self-healing emulsion penetrates the substrate defects and forms numerous polymer crystalline particles that effectively fill the microcracks.
通过用复合聚合物涂层对胶凝材料进行表面保护，可以以方便且永久的方式提高混凝土结构的耐久性。然而，在复杂多变的环境中，聚合物涂层容易受到各种机械和物理劣化的影响。本文采用聚合物微观结构调控理论来提高复合涂层防护性能的可持续性。利用两亲性Janus纳米粒子调控的自组装核壳结构对可调聚苯乙烯丙烯酸酯-聚硅氧烷自修复涂层进行改性。结果表明，制备的自组装涂层的附着力强度达到3.7MPa，足以抵抗物理侵蚀、渗漏和离子腐蚀对胶凝材料微观结构造成的破坏。由Janus粒子调控的自修复涂层的残余蠕变仅为57.03%，最大损耗角正切为0.381。此外，由于存在强氢键，该材料表现出优异的形状记忆功能。调控后的自修复涂层通过桥接和填充效应修复了机械和热变形下的聚合物结构损伤。该涂层在湿润状态下的拉伸强度恢复率高达71.23%，同时其电化学性能和耐腐蚀性迅速恢复。此外，自修复乳液渗透到基体缺陷中，形成大量聚合物结晶颗粒，有效填充微裂纹。
