Zhao Yibo, Zhang Junli, Xu Qing, Mi Hao-Yang, Zhang Yongliang, Li Tao, Sun Houyu, Han Jian, Liu Chuntai, Shen Changyu
National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Materials Processing and Mold, Zhengzhou University, Zhengzhou 450000, China.
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450000, China.
ACS Appl Mater Interfaces. 2020 Mar 18;12(11):13296-13304. doi: 10.1021/acsami.9b22877. Epub 2020 Mar 3.
Delamination of coating layer from polymer substrate limits the lifetime and functionality of the protective films. Silicone coating is especially vulnerable to photo irradiation, hydrothermal degradation, and mechanical deformation due to the low interfacial adhesion and mechanical robustness. Herein, an ingenious approach is developed to fabricate ultrastable and durable silicone coating on polycarbonate (PC) substrate through well-controlled nanoscale interfacial engineering. A nanopillar array is fabricated on the PC surface by vacuum-assisted hot embossing using anodic aluminum oxide (AAO) templates. Significant improvement in interfacial shear strength (ISS) is achieved for the silicone coating on the nanostructured PC surface. The delamination mechanism can be controlled by tuning the nanopillar size, and the maximum ISS of 9.9 MPa was reached on a surface with a nanopillar diameter of 320 nm. Attributed to the increased interfacial area and mechanical interlocking structure, the nanostructured interface can effectively dissipate interfacial stress and prevent cracking; therefore, maintaining excellent transparency and performance in the harsh environment. The coating exhibits extraordinary stability and durability when subjected to UV irradiation for 168 h, hydrothermal aging for 120 h, mechanical bending for 1000 cycles, and even surface damage. Thus, the tough silicone coating on polymer substrate realized by nanoscale interfacial engineering is a promising technique for highly stable and durable transparent surface protection.
涂层与聚合物基材的分层限制了保护膜的使用寿命和功能。由于界面附着力低和机械强度不足，有机硅涂层尤其容易受到光辐照、水热降解和机械变形的影响。在此，通过精心控制的纳米级界面工程，开发了一种在聚碳酸酯（PC）基材上制备超稳定且耐用的有机硅涂层的巧妙方法。使用阳极氧化铝（AAO）模板通过真空辅助热压印在PC表面制备纳米柱阵列。纳米结构PC表面上的有机硅涂层的界面剪切强度（ISS）得到了显著提高。可以通过调整纳米柱尺寸来控制分层机制，在纳米柱直径为320nm的表面上达到了9.9MPa的最大ISS。由于界面面积增加和机械互锁结构，纳米结构界面可以有效地消散界面应力并防止开裂；因此，在恶劣环境中保持优异的透明度和性能。该涂层在经受168小时的紫外线照射、120小时的水热老化、1000次循环的机械弯曲甚至表面损伤时，都表现出非凡的稳定性和耐久性。因此，通过纳米级界面工程实现的聚合物基材上的坚韧有机硅涂层是一种用于高度稳定和耐用的透明表面保护的有前途的技术。
