To fabricate mechanically stable superhydrophobic surfaces, conventional methods often involve complicated and time-consuming processing to improve the interface adhesion between coating and substrate, such as multi-step pre-treatments of the substrate and long time post-curing for both substrate and coating. Here, we report a facile and fast method to prepare the robust and stretchable superhydrophobic surface by rapid UV cross-linking of the superhydrophobic coating (based on polydimethylsiloxane/silica composite) onto a stretchable substrate. Polyurethane acrylate (PUA) with double bonds was UV cured to form the stretchable elastomeric substrate, the surface of which remains uncured PUA due to the presence of oxygen inhibition. The oxygen-inhibited layer of the substrate can provide a lot of reactive sites for covalently bonding to the superhydrophobic coating under UV exposure and thus eliminates the requirement for complicated surface treatments of the substrate. The formed covalent cross-linking between the superhydrophobic coating and the PUA substrate facilitates their interface adhesion. As expected, the superhydrophobic coating covalently-bonded to the PUA substrate shows good superhydrophobicity and self-cleaning ability against mechanical abrasion and stretching damages. Besides, the resulting superhydrophobic surface can withstand 1000-cycle stretching-releasing (strain of 0% → 200% → 0%) without losing its original superhydrophobicity. Thus, this robust superhydrophobic surface could find a wide range of water-proof applications for flexible substrates such as stretchable electronics, functional textiles, and outdoor sport goods.

为了制造机械稳定的超疏水表面，常规方法通常涉及复杂且费时的处理以改善涂层与基材之间的界面粘合性，例如基材的多步预处理以及基材和涂料的长时间后固化。在这里，我们报告了一种通过将超疏水涂层（基于聚二甲基硅氧烷/二氧化硅复合材料）快速紫外线交联到可拉伸基材上来制备坚固且可拉伸的超疏水表面的便捷方法。将具有双键的聚氨酯丙烯酸酯（PUA）进行UV固化，以形成可拉伸的弹性体基材，由于存在氧气抑制作用，其表面保持未固化的PUA。基材的氧抑制层可以提供许多反应位点，以在紫外线下共价键合到超疏水涂层上，因此消除了对基材进行复杂表面处理的要求。超疏水涂层和PUA基材之间形成的共价交联促进了它们的界面粘合。如预期的那样，共价键合到PUA基材上的超疏水涂层表现出良好的超疏水性和对机械磨损和拉伸损伤的自清洁能力。此外，所得的超疏水表面可以经受1000次循环的拉伸-释放（应变为0％→200％→0％），而不会失去其原始的超疏水性。因此，