Abstract
This study proposes to utilize modified Nano-SiO2/fluorinated polyacrylate emulsion that was synthesized with a semi-continuous starved seed emulsion polymerization to improve the hydrophobicity, thermal stability, and UV-Vis absorption of polyacrylate emulsion film. To verify the proposed method, a series inspection had been conducted to investigate the features of the emulsion film. The morphological analysis indicated that Nano-SiO2 was surrounded by a silane molecule after modification, which can efficiently prevent silica nanoparticles from aggregating. Fourier transform infrared spectra confirmed that modified SiO2 and dodecafluoroheptyl methacrylate (DFMA) were successfully introduced to the copolymer latex. The particle size of latex increased with the introduction of modified Nano-SiO2 and DFMA. UV-Vis absorption spectra revealed that modified silicon nanoparticles can improve the ultraviolet shielding effect obviously. X-ray photoelectron spectroscopy illustrated that the film–air interface was richer in fluorine than film section and the glass side. The contact angle of modified Nano-SiO2/fluorinated polyacrylate emulsion containing 3 wt % DFMA was 112°, slightly lower than double that of polyacrylate emulsion, indicating composite emulsion films possess better hydrophobicity. These results suggest that introducing modified Nano-SiO2 and fluorine into polyacrylate emulsion can significantly enhance the thermal stability of emulsion films.
Highlights
Being widely used in aircraft, functional smart coating, building, navigation, textile, and many other fields, hydrophobic material has attracted considerable attention in recent years [1,2,3]
It has been widely applied to material coating [14,15,16,17] and many studies on hydrophobic coatings have focused on silica- and fluorine-modified acrylic polymers [18]
Another method is based on emulsion polymerization in the presence of Nano-SiO2
Summary
Being widely used in aircraft, functional smart coating, building, navigation, textile, and many other fields, hydrophobic material has attracted considerable attention in recent years [1,2,3]. Among all inorganic materials, such as SiO2 , TiO2 , Al2 O3 , ZrO2 , and CaCO3 , Nano-SiO2 is considered the most promising composite [11] It can significantly improve the mechanical property, heat-resistance, and weather-resistance of a polymer, and reduce the cost of organic materials and emissions of volatile organic compounds. The interaction between inorganic nanoparticles and the organic components was weak in such cases Another method is based on emulsion polymerization in the presence of Nano-SiO2. Zhou et al [7] synthesized organic fluorine and Nano-SiO2 modified polyacrylate emulsifier-free latex film, via emulsifier-free emulsion polymerization. Latex film presented excellent mechanical properties and hydrophobicity, current synthesis of Nano-SiO2 /fluorinated polyacrylate hydrophobic emulsion still has challenges, such as the usage of organic solvent, which can cause environmental problems. The thermal stability and ultraviolet shielding effect of composite and their impact on the hydrophobicity of the latex film were investigated
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