Mossayebi Zahra, Jafari Vianna F, Gurr Paul A, Simons Ranya, Qiao Greg G
Department of Chemical Engineering, The University of Melbourne, Melbourne, Victoria 3010, Australia.
CSIRO Manufacturing, Melbourne, Victoria 3169, Australia.
ACS Appl Mater Interfaces. 2023 Feb 8;15(5):7454-7465. doi: 10.1021/acsami.2c21500. Epub 2023 Jan 28.
Ice build-up on solid surfaces causes significant economic losses for a range of industries. One solution to this problem is the development of coatings with low ice adhesion strength. Amphiphilic poly(ionic liquid) (PIL)-based surfaces have been recently reported for antifogging/antifrosting applications. However, they have possible anti-icing properties through lowering the ice adhesion strength that have yet to be reported. Herein, we designed well-defined triblock copolymers composed of a polydimethylsiloxane component coupled with PIL segments of poly([2 (methacryloyloxy)ethyl] trimethylammonium chloride) (PMETAC), which were subsequently UV-cured with an oligo(ethylene glycol) dimethacrylate (OEGDMA) cross-linker. The structure-property relationships of the resultant semi-interpenetrating polymer networks (SIPNs) were investigated by varying the counterion (i.e., trimethylammonium bis(trifluoromethanesulfonyl)imide (TFSI)) and the content of the PIL segments and cross-linker. An ice adhesion strength as low as 13.3 ± 8.6 kPa was observed for the coating containing 12.5 wt % of PMETAC segment and 5 wt % of OEGDMA, which is one of the lowest values reported so far for the amphiphilic coatings. Characterization of the coatings in terms of surface features, wettability, and hydration states have enabled the elucidation of different deicing mechanisms. Self-lubrication due to the existence of nonfreezable bound water led to the obtained low ice adhesion strength. This work offers a new approach for the exploration of PIL-based icephobic coatings for practical applications.
固体表面结冰会给一系列行业造成重大经济损失。解决这一问题的一种方法是开发具有低冰粘附强度的涂层。最近有报道称基于两亲性聚（离子液体）（PIL）的表面可用于防雾/防霜应用。然而，它们通过降低冰粘附强度而可能具有的抗冰性能尚未见报道。在此，我们设计了由聚二甲基硅氧烷组分与聚（[2 - （甲基丙烯酰氧基）乙基]三甲基氯化铵）（PMETAC）的PIL链段组成的明确三嵌段共聚物，随后用聚乙二醇二甲基丙烯酸酯（OEGDMA）交联剂进行紫外光固化。通过改变抗衡离子（即三甲基铵双（三氟甲磺酰）亚胺（TFSI））以及PIL链段和交联剂的含量，研究了所得半互穿聚合物网络（SIPN）的结构 - 性能关系。对于含有12.5 wt%的PMETAC链段和5 wt%的OEGDMA的涂层，观察到冰粘附强度低至13.3±8.6 kPa，这是迄今为止报道的两亲性涂层的最低值之一。通过对涂层的表面特征、润湿性和水合状态进行表征，阐明了不同的除冰机制。由于存在不可冻结的结合水而产生的自润滑导致了所获得的低冰粘附强度。这项工作为探索用于实际应用的基于PIL的憎冰涂层提供了一种新方法。
