Zheng Haili, Liu Guojun, Nienhaus Brandon Becher, Buddingh Jasmine V
Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada K7L 3N6.
ACS Appl Mater Interfaces. 2022 Feb 2;14(4):6071-6082. doi: 10.1021/acsami.1c23483. Epub 2022 Jan 21.
Ice readily sheds from weak oil-swollen polymer gels but tends to adhere to mechanically robust coatings. This paper reports bilayer coatings that simultaneously possess high bulk hardness but low ice adhesion. These coatings are prepared by cocuring a triisocyanate, P#'--PDMS [a methacrylate polyol bearing poly(dimethylsiloxane) (PDMS) side chains with # being 1, 2, or 3 and denoting ], and optionally a methacrylate polyol P#. The self-assembly of the system during coating formation yields a PDMS brush layer on the surface of the cross-linked polyurethane matrix. After the surface PDMS layer is lubricated with a silicone oil, this coating exhibits an ice adhesion τ that is 10 000-fold lower than that of a triisocyanate/P# coating. Ice slides under its own weight on such a coating at a tilt angle of 3°. Yet, the coating matrix is harder than poly(ethylene terephthalate), a widely used plastic. Additionally, such a coating maintains its low τ values for more than 10 consecutive icing/deicing cycles. Subsequent increases in τ are reversed by allowing time for the replenishment of the depleted surface lubricant with that released from the coating matrix. This design opens the door for effective yet hard ice-shedding polymer coatings.
冰很容易从脆弱的油溶胀聚合物凝胶上脱落，但往往会附着在机械性能强劲的涂层上。本文报道了一种双层涂层，它同时具有高硬度但低冰附着力。这些涂层是通过将三异氰酸酯、P#'--PDMS（一种带有聚二甲基硅氧烷（PDMS）侧链的甲基丙烯酸多元醇，其中#为1、2或3， 表示 ），以及任选的甲基丙烯酸多元醇P#共固化制备而成。涂层形成过程中体系的自组装在交联聚氨酯基体表面产生一层PDMS刷层。在用硅油对表面的PDMS层进行润滑后，这种涂层的冰附着力τ比三异氰酸酯/P#涂层低10000倍。冰在自身重量作用下能以3°的倾斜角在这样的涂层上滑动。然而，该涂层基体比广泛使用的塑料聚对苯二甲酸乙二酯更硬。此外，这样的涂层在连续10多个结冰/除冰循环中都能保持其低τ值。通过留出时间让从涂层基体释放的润滑剂补充耗尽的表面润滑剂，随后τ的增加可以逆转。这种设计为有效且坚硬的冰脱落聚合物涂层打开了大门。
