Macromolecular Materials and Engineering · 2019 · 20 citations · 27 references
Natural SciencesMaterials EngineeringMaterials SciencePolymer ChemistrySurface ScienceThin FilmsDielectric PropertiesDielectricsPolymer SurfacesPolymer Thin FilmsSurface HydrophobicitySurface ModificationDielectric ConstantInsulating MaterialsPorous Surface StructureRelative Humidity EffectsSuperhydrophobic CoatingsSuperhydrophobic SurfacesSuperhydrophobicityWater Contact Angle
Abstract Porous interior structured polyimide (PI) films with a hierarchical surface are fabricated from 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride and 4,4′‐oxydianiline by a water vapor induced phase separation process under a humid environment. Superhydrophobic properties with a water contact angle of 161° are obtained using the hierarchical surface morphology, which can be adjusted from flower‐like to wrinkle‐shape particles facilely by changing the relative humidity. The dielectric constant ( k ) of the PI film decreases sharply from 2.8 (film prepared under dry conditions) to ≈1.9 (film prepared under humid conditions) because of the interior porous structure and fluorine‐containing framework. Both a low‐ k and superhydrophobicity are very important parameters for PI films in microelectronic and insulating applications.
27
Robust Anti‐Icing Performance of a Flexible Superhydrophobic Surface
Lei Wang, Qihua Gong, Shihui Zhan et al. · Advanced Materials · 2016 · 619 citations
Natural Sciences, Materials Engineering, Materials Science +14
Preparation of Honeycomb-Patterned Polyimide Films by Self-Organization
Hiroshi Yabu, Masaru Tanaka, Kuniharu Ijiro et al. · Langmuir · 2003 · 240 citations
Natural Sciences, Materials Engineering, Materials Science +12
Wenjing Ma, Mengjie Zhang, Zhongche Liu et al. · Journal of Membrane Science · 2018 · 238 citations