Stabilized dispersions of titania nanoparticles via a sol-gel process and applications in UV-curable hybrid systems

摘要

Organic-inorganic hybrid UV-curable coatings were synthesized through blending UV-curable components and stabilized titania sol prepared via a sol-gel process of tetrabutyl titanate(TBT)with three different stabilizers,acetylacetone(Acac),isopropyl tri(dioctyl)pyrophosphato titanate coupling agent(TTPO)and a polymerizable organic phosphoric acid(MAP).The size and the dispersion of titania particle in the UV-cured organic matrix were dominated by the properties of these stabilizers.A cured hybrid film with titania particle size around 20 nm was obtained when TTPO was utilized as protection agent for the sol.It is interesting that the hardness and flexibility of the photocured hybrid films were improved simultaneously,in contrast to results with neat organic UV-curable formulations.