Abstract
In order to obtain photoresponsive silicon dioxide nanopowders, fluoropolymer/SiO2 composite microspheres were prepared with a thiol-terminated fluoropolymer and with SiO2 microspheres grafted by acrylate via the thiol-ene click reaction; then, photoresponsive SiO2 nanopowders were synthesized by grafting azobenzene monomers on the surface of the SiO2 composite microspheres by esterification. The fluoropolymer and SiO2 composite microspheres were characterized via proton nuclear magnetic resonance, scanning electron microscopy, contact angle tests, dynamic light scattering, and UV-Vis absorption spectroscopy. The surface of the coating prepared using SiO2 nanopowders exhibited a high contact angle up to 130.9°. When the surface was irradiated with UV light, the contact angle decreased to 104.1°. Reversible changes in the surface wettability could be realized under the alternate irradiation of ultraviolet and visible light, thus achieving excellent photoresponsiveness.
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