Fluorinated poly(isobornyl methacrylate–co–butyl acrylate) core–shell latex nanoparticles: Synthesis, morphology and wettability of films
2013
Cheng, Yaobo | Wang, Zhonggang
A fluorinated acrylate monomer simultaneously containing one hydrophilic hydroxyl and one hydrophobic perfluoroalkyl group was synthesized, which was then utilized to copolymerize with isobornyl methacrylate and butyl acrylate to prepare core–shell-structured latex nanoparticles through two-step emulsion polymerization. In this synthesis process, no any organic solvents or fluorine-containing surfactants were added. The perfluoroalkyl moieties are in the shell layer and the fluorine contents in the whole system range from 0 to 12.83 wt%. A clear core–shell interface is observed by transmission electron microscopy. The dynamic light scatterings show that the average particle sizes are around 95 nm. After film-formation, the angle-resolved XPS demonstrates that the ratios of F/C and CF₃/CF₂ have a significant gradient growth from the inner bulk up to the film surface, indicating that the fluorinated groups have segregated to the topmost layer with the CF₃ termini oriented upward, which is consistent with the AFM images that some pointed bumps appear on the surface and the number increases with the fluorine content. As a consequence, the enriched perfluoroalkyl moieties, especially the CF₃ groups, result in that the film with small amount of fluorine in the polymer exhibits a very low surface tension and high water contact angle.
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