Preparation and surface properties of core-shell fluorosilicone polyacrylate latex film

Core-shell fluorosilicone acrylic (FSiA) particles were prepared by two stage emulsion polymerization in the presence of common hydrocarbon acrylic monomers, trifluoroethyl methacrylate (TFEMA) and vinyltriethoxysilane (VTES). Morphology of latex particles was characterized by TEM. Surface properties of the film annealed at 100 °C for 1 h, 3 h, 5 h and 8 h were characterized by ATR-FTIR, AFM and SEM-EDS. Thermal properties of FSiA copolymer were investigated by TG-DSC analysis. TEM analysis indicated that two types of core-shell latex particles (CS-1 and CS-2) occurred in the process of emulsion polymerization, one is that fluorine-containing polymer existed at shell (CS-1), the other is that fluorine-containing polymer existed in the core (CS-2). ATR-FTIR and SEM-EDS data showed that as annealing time was increased, more fluorinated segments were found at the film surface. Fluorine content at the film surface increased from 2.25 wt.% (1.7 atom%) to 4.31 wt.% (3.22 atom%). AFM analysis suggested that the film surface topography was affected significantly by annealing time. The film showed excellent water resistant property due to the crosslinked network of SiOSi in the film.