The Preparation And Characterization Of Fluoro-silicone Hydrophobic And Oleophobic Materials

Novel fluorine-silicone hybrid materials and the properties of various silica surfaces modified with the so-synthesized fluorine-silicone hybrid materials were investigated. The main contents of this thesis are list as follows.1. The effective assembly conditions were obtained through assembly experiment with the siloxane compounds. In general, surface assembly can be achieved effectively in the concentration of 1mM/L, at room temperature for 24h (or at 50-60℃for 1-2h), using of a little of acetic acid as catalyst. Surface wettebilities can be turned, When glass slides were assembled with siloxane coupling agent, followed by the assembled of fluorine-containing reagents, When the glass slide surface was etched with hydrofluoric acid, followed by fluorinated siloxane, the surface hydrophobicity and oleophobicity will have a dramatic change.2. A series novel fluorine-containing monomers [AFA, MAFA, DAFA, FOA, FOSt] were synthesized, and employed for copolymer formations with vinyltrimethoxysilane or vinyltriethoxysilane. The surface reactive polymers were assembled on glass slides by Si-O-Si linkage formation. The surface wettebilities and stabilities of thus formed memebrane were investigated as gradient films.3. A series of novel fluoro-silicone polymer emulsion were synthesized in water phase by fluorine-containing monomers, with MMA and VTES as starting materials, SDS and OP-10 as emulifiers, while APS as initiator and various nanoparticles as fillers. The results showed that the products possesses good stabilities and film-forming properties. Meanwhile the thin films were clear and smooth, at the same time possessing the properties of good hydrophobicity (oleophobicity), good thermal stability as well as good chemical resistance after annealing.4. Based on the natural biomimetic superhydrophobic phenomenon, we developed a composite material with surface superhydrophobicity by modifying fluorine-containing compounds with nano-SiO₂. The film surface showed a water contact angle up to174.8°, rolling angle less than 2°.