FTIR-ATR SPECTROSCOPIC STUDY OF MIGRATION OF NANO-SiO₂ PARTICLES IN COMPOSITE COATINGS

The migration phenomena of nano-SiO₂ particles in UV cured composite coatings are studied by FTIR-ATR and the factors affecting the distributing gradient of nano-SiO₂ particles in coating are discussed by semi-quantitative analysis. The results show that nano-SiO₂ particles migrate to the surface of composite coatings. The distributing gradient of nano-SiO₂ in the coating is larger when the nano-SiO₂ content or its molecular weight or graft ratio or the polarity of host resin is larger.