Li Hui, Tang Songsong, Zhou Qingqing, Chen Wei, Yang Xixue, Xing Tieling, Zhao Yan, Chen Guoqiang
College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China.
School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
J Colloid Interface Sci. 2021 Jul;593:79-88. doi: 10.1016/j.jcis.2021.03.006. Epub 2021 Mar 9.
Fluorinated polyhedral oligomeric silsesquioxane (F-POSS) is one of the most popular candidates at present for superhydrophobic coating. Because of its ultralow surface energy, F-POSS has usually been dissolved with expensive fluoro-solvents, and the melting temperature of F-POSS is not high (122-140 °C), which will cause its loss during use. So trying to polymerize/crosslink F-POSS molecules and/or directly graft F-POSS to substrate is important. In this work, we report the SI-eATRP grafting of methacryl POSS (MA-POSS) on cotton and the subsequent amine catalyzed thiol-methacrylate Michael addition reaction of poly(MA-POSS) with 1H, 1H, 2H, 2H-perfluorododecyl-1-thiol (PFDT) for the fabrication of a durable poly(MA-POSS)-PFDT coating. The cotton fabric coated with poly(MA-POSS) was nearly superhydrophobic after 4 h of SI-eATRP process under potentiostatic condition of -0.40 V. Although the water contact angle (WCA) was ~148°, water droplets tended to adhere to the cotton fabric surface even when the fabric was turned upside down. After fluorination, WCA was increased to ~160°, and water drops could slide off when the fabric was slightly tilted. The sliding angle (SA) was ~10°. The as-prepared poly(MA-POSS)-PFDT coating was durable against repeated washing and physical abrasion. After 30 accelerated washing cycles (equals to 150 home laundering cycles), the coated fabric still showed superhydrophobicity. After 800 abrasion cycles over sandpaper, the WCA was still as high as 149°. In addition, the coated fabric had self-healing ability and could restore its superhydrophobicity after plasma etching through heat treatment. After 10 cycles of plasma etching and heat-induced healing process, the WCA of the coated fabric kept at ~154°. Such a durable superhydrophobic fabric coating may find applications in the development of functional clothing for a variety of purposes.
氟化多面体低聚倍半硅氧烷（F-POSS）是目前超疏水涂层最热门的候选材料之一。由于其超低的表面能，F-POSS通常要用昂贵的氟代溶剂溶解，而且F-POSS的熔点不高（122-140℃），这会导致其在使用过程中损失。因此，尝试使F-POSS分子聚合/交联和/或将F-POSS直接接枝到基底上很重要。在这项工作中，我们报道了甲基丙烯酸POSS（MA-POSS）在棉织物上的SI-eATRP接枝以及随后聚（MA-POSS）与1H，1H，2H，2H-全氟十二烷基-1-硫醇（PFDT）的胺催化硫醇-甲基丙烯酸酯迈克尔加成反应，用于制备耐用的聚（MA-POSS）-PFDT涂层。在-0.40 V恒电位条件下进行4小时的SI-eATRP过程后，涂有聚（MA-POSS）的棉织物几乎具有超疏水性。尽管水接触角（WCA）约为148°，但即使织物倒置，水滴仍倾向于附着在棉织物表面。氟化后，WCA增加到约160°，当织物稍微倾斜时水滴会滑落。滑动角（SA）约为10°。所制备的聚（MA-POSS）-PFDT涂层耐反复洗涤和物理磨损。经过30次加速洗涤循环（相当于150次家庭洗涤循环）后，涂层织物仍表现出超疏水性。在砂纸表面进行800次磨损循环后，WCA仍高达149°。此外，涂层织物具有自修复能力，通过热处理在等离子体蚀刻后可以恢复其超疏水性。经过10次等离子体蚀刻和热诱导修复过程后，涂层织物的WCA保持在约154°。这种耐用的超疏水织物涂层可用于开发各种用途的功能性服装。
