Fabrication and characterization of stable superhydrophobic fluorinated-polyacrylate/silica hybrid coating

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• 作者：Kunquan Li ; Xingrong Zeng ; ^{psxrzeng@gmail.com" class="auth_mail} ; Hongqiang Li ; Xuejun Lai
• 关键词：Superhydrophobic ; Emulsion polymerization ; Fluorinated polyacrylate ; Silica ; Hybrid coating
• 刊名：Applied Surface Science
• 出版年：15 April, 2014
• 年：2014
• 卷：298
• 期：Complete
• 页码：214-220
• 全文大小：2516 K

文摘

The core-shell fluorinated-polyacrylate (PFA) emulsion was synthesized through emulsion polymerization method and the superhydrophobic PFA/SiO₂ hybrid coating was successfully fabricated on the slide glass by spraying the mixture of PFA emulsion and hydrophobic SiO₂ particles using ethanol as cosolvent. The PFA emulsion was characterized by Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), water contact angle (WCA), transmission electron microscopy (TEM), and the effects of SiO₂ content on the wetting behavior and surface morphology of PFA/SiO₂ hybrid coating were investigated. To evaluate the stability of the hybrid coating, the acid and base resistance, weatherability and thermal stability were also studied. Results showed that the obtained PFA latex exhibited a core-shell structure with a particle size of 134.1 nm and a narrow polydispersity of 0.03. With the increase of dodecafluoroheptyl methacrylate (DFMA) content in the latex shell from 0 wt% to 31.8 wt%, the WCA of the PFA film enlarged from 85掳 to 104掳, indicating that the introduction of fluorinated monomer was effective in reducing the surface energy. By adding different amount of SiO₂ particles, the surface morphology and wetting behavior of the PFA/SiO₂ hybrid coatings could be controlled. When the mass ratio of SiO₂ to PFA emulsion was 0.2, the surface roughness (Rq) increased to 173.6 nm and the wetting behavior of the surface became superhydrophobic with a WCA of 153掳, resulted from the corporation of low surface energy and the binary nano/microstructure on the surface. The as-prepared PFA/SiO₂ hybrid coating showed good acid and base corrosion resistance, and it could keep superhydrophobicity after being heated at 250 掳C for 2 h or exposed to ambient atmosphere for more than 3 months. Additionally, the superhydrophobic PFA/SiO₂ hybrid coating could be applied to various substrates through spraying. This was a green and eco-friendly method in fabricating stable organic/inorganic hybrid superhydrophobic coating because none of toxic organic solvents were used during the whole process.