关键词: 种子乳液聚合, 改性纳米SiO₂, 含氟丙烯酸酯, 疏水性, 反相核壳结构

Abstract: A core-shell type nano-SiO₂/polyurethane-fluorinated acrylate（SiO₂/FPUA)hybrid emulsion was synthesized by seeded emulsion polymerization using polyurethane（PU)as seed, which served as shell phase in the hybrid emulsion mentioned above, with the core phase consisting of nano-SiO₂ modified by γ-(methacryloxy)propyltrimethoxy silane（KH-570), methyl methacrylate（MMA), butyl acrylate（BA)and dodecafluoroheptyl methacrylate（DFMA).The influence of the amount of nano-SiO2 and fluorine-containing monomer（DFMA)on emulsion polymerization process and surface hydrophobic properties of the latex films were discussed.The nano-SiO₂/fluorinated polyacrylate emulsion and the latex film were characterized by Fourier transform infrared spectrum（FT-IR), transmission electron microscopy（TEM), contact angle（CA), thermogravimetry （TG)， differential scanning calorimetry（DSC)and mechanical properties test（MPT）analysis.The results indicated that the latex particles showed a “reverse core-shell” structure, with PA as core and PU as shell, and the hydrophobicity and comprehensive properties of the latex film were greatly improved owing to the synergistic effect of DFMA and nano-SiO₂.

Key words: seeded emulsion polymerization, modified nano-SiO₂, fluorinated acrylate, hydrophobicity, inverse core-shell structure