Abstract Polyimide (PI) films with special wettability have received great attention for their potential applications. However, it is still a challenge to fabricate PI film with tunable wettability from hydrophobic to superhydrophobic and tensile strength > 140 MPa. Herein, PI films with tunable surface wettability induced by the nano flowers of SA through the self-assembly. Flower-like ZnO was grown on PI film without seed layer or morphology controlling agents via a simple hydrothermal method, which promoted to the self-assembly of SA into nano-flowers. Morphologies of ZnO crystals change from open-flower to sphere-bud just by tuning the synthetic concentration of zinc solution. SA can assemble into nano flower-like structures on all ZnO modified films resulting in water contact angles changing from 124.0° to 155.5°. The self-assembly mechanism was also investigated. The superhydrophobic PI exhibits stable superhydrophobicity under dynamic water pressure, which is a crucial parameter for potential self-cleaning employment. Thermal stability of superhydrophobic film are comparable to the pristine PI film. Tensile strength of superhydrophobic PI film is higher than 140 MPa.

中文翻译：

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硬脂酸自组装成纳米花诱导聚酰亚胺薄膜的可调表面润湿性

摘要 具有特殊润湿性的聚酰亚胺（PI）薄膜因其潜在的应用而备受关注。然而，制造具有从疏水到超疏水的可调润湿性和拉伸强度> 140 MPa的PI薄膜仍然是一个挑战。在此，由 SA 的纳米花通过自组装诱导具有可调表面润湿性的 PI 薄膜。通过简单的水热方法在没有种子层或形态控制剂的 PI 膜上生长花状 ZnO，促进了 SA 自组装成纳米花。仅通过调节锌溶液的合成浓度，ZnO 晶体的形态就会从开放花变为球形芽。SA 可以在所有 ZnO 改性薄膜上组装成纳米花状结构，导致水接触角从 124.0° 变为 155.5°。还研究了自组装机制。超疏水 PI 在动态水压下表现出稳定的超疏水性，这是潜在自清洁应用的关键参数。超疏水膜的热稳定性与原始 PI 膜相当。超疏水 PI 薄膜的拉伸强度高于 140 MPa。