State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, PR China.
Center of Innovation and Research in Materials and Polymers (CIRMAP), University of Mons, Mons, Belgium.
J Colloid Interface Sci. 2022 Dec 15;628(Pt B):777-787. doi: 10.1016/j.jcis.2022.08.063. Epub 2022 Aug 12.
Rough structures have gained increasing attention since they are essential for surfaces with special wettability, which can be used for various applications. It is still a challenge to find a low-cost and simple way to fabricate rough surfaces despite extensive efforts. Herein, we report a facile strategy to fabricate self-roughened surfaces based on polarity-induced phase separation. The strategy relies on the migration of flexible chains of the nonpolar polysiloxane to airside, driven by surface tension and polarity difference with the polar crosslinker, which forms a self-roughened surface with numerous protrusions. It is worth noting that this strategy does not require strict control of procedures, since it is insensitive to environmental changes unlike other phase separation methods, as shown by the results of systematic studies on several key parameters. Modified fabrics and coatings exhibit excellent superhydrophobicity with a water contact angle higher than 160°. Moreover, due to the strong hydrogen bonds formed by the polar urea groups of the crosslinker with substrates, the abrasion resistance of the coating is significantly enhanced. It is believed that the proposed novel and facile strategy will be a promising candidate for industrial manufacturing.
粗糙结构因其对具有特殊润湿性的表面至关重要而受到越来越多的关注，这些表面可应用于各种领域。尽管已经付出了广泛的努力，但寻找一种低成本且简单的方法来制造粗糙表面仍然是一个挑战。在此，我们报告了一种基于极性诱导相分离的简便策略来制造自粗糙化表面。该策略依赖于非极性聚硅氧烷的柔性链在表面张力和与极性交联剂的极性差的驱动下迁移到空气侧，从而形成具有众多突起的自粗糙化表面。值得注意的是，与其他相分离方法不同，该策略不需要严格控制程序，因为它对环境变化不敏感，系统研究几个关键参数的结果证明了这一点。改性后的织物和涂层表现出优异的超疏水性，水接触角高于 160°。此外，由于交联剂的极性脲基团与基底形成强氢键，涂层的耐磨性得到显著提高。可以相信，所提出的新颖且简便的策略将成为工业制造的有前途的候选方案。
