Fabrication and characterization of stable superhydrophobic fluorinated-polyacrylate/silica hybrid coating
Fabrication and characterization of stable superhydrophobic fluorinated-polyacrylate/silica hybrid coating
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DOI：
10.1016/j.apsusc.2014.01.164
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发表时间：
2014-04-15
影响因子：
6.7
通讯作者：
Lai, Xuejun
中科院分区：
文献类型：
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作者：
Li, Kunquan;Zeng, Xingrong;Lai, Xuejun
采用乳液聚合法合成了核壳型含氟聚丙烯酸酯（PFA）乳液，并以乙醇为助溶剂，将PFA乳液与疏水SiO2粒子混合后喷涂于载玻片上，成功制备了PFA/SiO2杂化超疏水涂层。采用傅里叶变换红外光谱（FTIR）、动态光散射（DLS）、水接触角（WCA）、透射电镜（TEM）等方法对PFA乳液进行表征，研究了SiO2含量对PFA/SiO2杂化涂层润湿性和表面形貌的影响。为了评价杂化涂料的稳定性，还研究了杂化涂料的耐酸碱性、耐候性和热稳定性。结果表明，所得PFA乳液为核壳结构，粒径为134.1 nm，多分散性为0.03。随着乳液壳层中甲基丙烯酸十二氟庚酯（DFMA）含量从0wt%增加到31.8wt%，PFA膜的WCA从85 °增大到104 °，表明含氟单体的引入有效地降低了PFA膜的表面能。通过添加不同量的SiO2粒子，可以控制PFA/SiO2杂化涂层的表面形貌和润湿性。当SiO2与PFA乳液的质量比为0.2时，表面粗糙度（Rq）增加到173.6 nm，表面润湿性达到超疏水性，WCA为153 °，这是由于低表面能和表面纳米/微结构的共同作用。所制备的PFA/SiO2杂化涂层具有良好的耐酸碱腐蚀性能，在250 ℃加热2 h或暴露于大气中3个月以上仍能保持超疏水性。此外，PFA/SiO2杂化超疏水涂层可以通过喷涂施加到各种基底上。该方法不使用有毒有机溶剂，是一种制备稳定的有机/无机杂化超疏水涂层的绿色环保方法。(C)2014年爱思唯尔B。V.保留所有权利。
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 dode-cafluoroheptyl methacrylate (DFMA) content in the latex shell from 0 wt% to 31.8 wt%, the WCA of the PFA film enlarged from 85 degrees to 104 degrees, 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 degrees, 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 degrees 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. (C) 2014 Elsevier B. V. All rights reserved.