【作者】 朱唐； 杨萌； 赵宁； 徐坚；

【Author】 Tang Zhu;Meng Yang;Ning Zhao;Jian Xu;Beijing National Laboratory for Molecular Science, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences;

【机构】 中国科学院化学研究所高分子物理与化学实验室；

【摘要】 近年来,粘附力可调的超疏水表面引起了学者的研究兴趣,因为其在基础研究和工业应用领域都展现出重要的应用前景,例如流体设备、液滴操控、微反应器、生物传感器等[1]。而表面形貌对浸润性具有非常重要的作用,可以用于超疏水表面水滴动态浸润行为的调控;其中,溶剂诱导结晶是表面微结构构筑的重要途径之一[2]。本文依据全同立构聚丙烯(i-PP)i-PP与无规立构聚丙烯PP(a-PP)结晶能力的差异,通过简单的溶液浇铸法制备出一系列水滴动态浸润行为可调的超疏水聚丙烯涂层。其中,纯i-PP涂层表面为微/纳多级结构,表现出大于150°的水接触角(CA)和小于5°的滑动角(5μL水滴);纯a-PP涂层微观形貌则具备较低的粗糙度,相应水接触角约为130°,并且水滴能够以任何倾斜角度粘附在该涂层上。然而,对于复合i-PP/a-PP涂层,随着a-PP和i-PP含量变化,可以实现CA> 150°的超疏水性以及从光滑到粘性的水滴粘附性。此外,与i-PP涂层相比,复合涂层中a-PP的存在有利于提高其机械性能。该方法可以用于超疏水改性各种基底,并且在自清洁、液滴无损失输运、超滑表面和超疏水表面图案化等领域具有重要应用。更多还原

【Abstract】 In recent years, the super-hydrophobic surface with adjustable adhesion has attracted the interest of scholars because it has shown important application prospects in basic research and industrial applications, including fluid equipment, droplet manipulation, microreactors, biosensors[1]. The surface morphology plays an important role in the infiltration, and can be used to control the dynamic infiltration behavior of super-hydrophobic surface water droplets. Among them, solvent-induced crystallization is one of the important ways of surface microstructure construction [2]. Polypropylene(PP), including isotactic PP(i-PP) and atactic PP(a-PP) with distinct tacticity, is one of the most widely used general plastics. Herein, ultra water repellent PP coatings with tunable adhesion to water were prepared via a simple casting method. The pure i-PP coating shows a hierarchical morphology with micro/nanobinary structures, exhibiting a water contact angle(CA) larger than 150° and a sliding angle less than 5°(for 5 μL water droplet). In contrast, the pure a-PP coating has a less rough morphology with a water contact angle of about 130°, and the water droplets stick on the coating at any tilted angles. For the composite i-PP/a-PP coatings, however, ultra water repellency with CA > 150° but water adhesion tailorable from slippery to sticky can be realized,depending on the contents of a-PP and i-PP. The different wetting behaviors are due to the various microstructures of the composite coatings resulting from the distinct crystallization ability of a-PP and i-PP. Furthermore, the existence of a-PP in the composite coatings enhances the mechanical properties compared to the i-PP coating.The proposed method is feasible to modify various substrates and potential applications in no-loss liquid transportation, slippery surfaces, and patterned superhydrophobic surfaces are demonstrated.更多还原