Self-assembly of hierarchical porous structure for stretchable superhydrophobic films by delicately controlling the surface energy

被引：8

作者：

Hou, Shuhan ^{[1
]}

Noh, Insub ^{[2
]}

Yue, Meng ^{[1
]}

Wang, Yanbin ^{[1
]}

Kim, Hyung Do ^{[2
]}

Ohkita, Hideo ^{[2
]}

Wang, Biaobing ^{[1
]}

机构：

[1] Changzhou Univ, Sch Mat Sci & Engn, Changzhou 213164, Peoples R China

[2] Kyoto Univ, Grad Sch Engn, Dept Polymer Chem, Nishikyo, Kyoto 6158510, Japan

来源：

MATERIALS ADVANCES | 2023年 / 4卷 / 22期

基金：

日本学术振兴会;

关键词：

ROBUST; FABRICATION; COATINGS; SEPARATION; MEMBRANE;

D O I：

10.1039/d3ma00794d

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Herein, thermoplastic polyurethane (TPU) was not only used as the means of attaching modified silica (m-SiO<INF>2</INF>), but was also used as a flexible polymer substrate combining with poly(amide-imide) (PAI) for improving the robustness of stretchable superhydrophobic films by self-assembly. m-SiO<INF>2</INF> floated up and TPU sank down in the superhydrophobic coating layer while TPU floated up and PAI sank down in the PAI-TPU stretchable substrate layer by delicately controlling the surface energies of the materials (gamma<INF>PAI</INF> > gamma<INF>TPU</INF> > gamma<INF>m-SiO<INF>2</INF></INF>). With this strategy, the two layers penetrated into each other, and the compatibility between the superhydrophobic coating and polymer substrate was improved due to the same component of TPU, which made m-SiO<INF>2</INF> firmly attach to the stretchable substrate and uniformly disperse into the PAI-TPU substrate. In addition, during the up-down process, a hierarchical porous structure with robust microscale bumps was formed, which offered a stable Cassie state. As expected, the PAI-TPU/m-SiO<INF>2</INF> superhydrophobic film was highly stretchable, and can bear 2000 cycles of stretching-releasing (0% -> 30% -> 0%) without sacrificing its superhydrophobicity. The tight adhesion between the decorated m-SiO<INF>2</INF> and stretchable substrate rendered outstanding mechanical robustness with resistance to sandpaper abrasion, knife-scuffing, ultrasonic treatment, and hot-water jet impact. The PAI-TPU/m-SiO<INF>2</INF> superhydrophobic surface also showed excellent durability when exposed to acid-base immersing, cooling or heating, and UV irradiation. Furthermore, the PAI-TPU/m-SiO<INF>2</INF> superhydrophobic surface possessed excellent self-healing, and icephobic properties. For practical application, PAI-TPU/m-SiO<INF>2</INF> stretchable superhydrophobic films were applied as water-proof covers for curved surfaces, or served as a self-cleaning coating. These versatile features demonstrated a simple and convenient method to fabricate stretchable superhydrophobic surfaces with multi-functionality.

引用

页码：5716 / 5729

页数：14

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