Superhydrophobic coating with multiscale structure based on crosslinked silanized polyacrylate and nanoparticles

To obtain a superhydrophobic surface with hierarchical micro/nanostructures, two kinds of SiO2 nanoparticles with different sizes were embedded into crosslinked silanized polyacrylate (CPSA). The silanized polyacrylate (PSA) was first synthesized via free radical copolymerization of acrylate monomers and vinyltrimethoxysilane (VTMS). Then, the silicone methoxyls of the VTMS units were subsequently crosslinked by a condensation reaction with hydroxy terminated polydimethylsiloxane (HTPDMS) to form CPSA. The structure of PSA and CPSA were characterized by Fourier transform infrared spectroscopy. The surface wetting property, surface morphology, mechanical robustness and anticorrosion performance of the CPSA/SiO2 coatings were systematically studied. The results demonstrated that the obtained coatings could be expediently sprayed onto substrates to create a water-repellent surface, and possessed good mechanical robustness and high corrosion resistance against NaCl solutions.