SiO2/polyurethane (SiO2/PUL) latexes modified by nano-SiO2 (treated with γ-amino propyltriethoxy silane (KH550)) and end capped by hydroxyethyl methacrylate (HEMA) were first prepared through the prepolymer process.Then a series of nano-SiO2/polyurethane-fluorinated polyacrylate (SiO2/PUFA) hybrid latexes were synthesized via the seed emulsion polymerization process using hexafluorobutyl methacrylate (HFMA) as modifier

SiO2/PUL as macromolecule emulsifier and seed emulsion.The properties of nano-SiO2/PUFA emulsions and their films were characterized by Fourier transform infrared spectroscopy (FT-IR)

transmission electron microscopy (TEM)

contact angle (CA)

differential scanning calorimetry (DSC)

thermogravimetry (TG) and tensile test machine.FT-IR characterization demonstrated that the polyurethane (PU) was successfully modified by modified nano-SiO2 and HFMA.TEM result indicated that the nano-SiO2 treated with KH550 was well dispersed in ethanol.Particle morphology of hybrid latex showed inverse core-shell structure

in which the core region was formed by acrylate (PA)

while the shell region was formed by PU.TG result showed that the thermal stability of the latexes film was obviously improved by nano-SiO2 particles.Water resistance and mechanical properties of nano-SiO2/PUFA films were greatly improved due to the multiple cross-linking formed by modified nona-SiO2 and fluorinated acrylate through the chemical bonds with polyurethane chains.