Department of Chemical & Biomolecular Engineering , National University of Singapore , 4 Engineering Drive 4 , Singapore 117585 , Singapore.
Institute of Materials Research and Engineering , 2 Fusionopolis Way, Innovis, #08-03 , Singapore 138634 , Singapore.
ACS Appl Mater Interfaces. 2018 Oct 31;10(43):37517-37528. doi: 10.1021/acsami.8b13403. Epub 2018 Oct 16.
Development of an anti-icing surface on a desired industrial coating patch/object has been the persistent challenge to several industries, such as aviation and wind power. For this aim, performing surface modification to implement the icephobic property on existing commercial coatings is important for practical applications. This work accomplishes an icephobic coating overlying a PPG aerospace polyurethane coating. It manifests a clear capability to delay the formation of frost as well as to reduce the adhesion strength of ice. This icephobic coating is sustained by a unique hydrophobic heterogeneity in the micron-scale of segregation, which is realized through solution casting of a specific copolymer consisting of random rigid and soft segments, namely poly(methyl methacrylate) and poly(lauryl methacrylate-2-hydroxy-3-(1-amino dodecyl)propyl methacrylate), respectively. A wrinkled pattern developed over the coating is observed because of the diverse traits between these two segments. Besides, the OH/NH groups of the soft segment are crosslinked by a diisocyanate monomer upon drying and curing to strengthen the coating. More importantly, integration of a small dose of paraffin wax into the copolymer induces a spread of soft microdomains on the winkled pattern surface. It is hypothesized that these dual heterogeneous assemblies are responsible for the icephobicity since they instigate distinct interactions with condensed water droplets. Lastly, the thermoelectric cooling (Peltier effect) and the adhesion strength of ice on the typical coatings were assessed. This investigation also includes examination on the icephobic durability of coating, which is enhanced when a small amount of polyethylene oligomer is incorporated into the coating.
在期望的工业涂层斑块/物体上开发抗冰表面一直是航空和风力等多个行业面临的持续挑战。为此，对现有商业涂料进行表面改性以实现疏冰性能对于实际应用非常重要。这项工作在 PPG 航空航天用聚氨酯涂料上实现了疏冰涂层。它表现出明显的延迟结霜形成以及降低冰附着强度的能力。这种疏冰涂层由微尺度分离的独特疏水性非均相性支撑，这是通过特定共聚物的溶液铸造实现的，该共聚物由随机刚性和柔性段组成，分别为聚（甲基丙烯酸甲酯）和聚（十二烷基甲基丙烯酸酯-2-羟基-3-（1-氨基十二烷基）丙基甲基丙烯酸酯）。由于这两个段之间的不同特性，在涂层上观察到形成了褶皱图案。此外，软段的 OH/NH 基团在干燥和固化过程中通过二异氰酸酯单体交联，以增强涂层。更重要的是，将少量石蜡蜡融入共聚物中会导致软微域在褶皱图案表面上扩散。据推测，这些双重非均相组装是疏冰性的原因，因为它们与冷凝水滴产生了明显的相互作用。最后，评估了典型涂层的热电冷却（珀耳帖效应）和冰的附着强度。这项研究还包括对涂层疏冰耐久性的检查，当少量聚乙烯低聚物被掺入涂层中时，疏冰耐久性会增强。
