Synthesis and Characterization of TiO<sub>2</sub>/ PSt/PVP Multilayer Core-Shell Hybrid Microspheres

Multiplayer core-shell TiO 2 /PSt/PVP hybrid microspheres were successfully synthesized by the copolymerization of vinylpyrrolidone in the solution of ethyl acetate with TiO 2 /PSt core-shell hybrid microspheres which were formed through the encapsulation of KH570-g-TiO 2 sol particles with styrene, while the active KH570-g-TiO 2 sol particles were prepared by the hydrolysis condensation of KH-570 with tetrabutyl titanate. Characterization technologies of FT-IR and TGA were applied to investigate the structure and the thermal stability of the product. The results showed that the hydroxyl groups from the hydrolysis of KH-570 condensed with the surface hydroxyl groups of TiO 2 , as well as PSt and PVP were grafted successively onto the surface of KH570-g-TiO 2 sol particles. The thermal decomposition temperature of TiO2/PSt/PVP was higher than TiO 2 /PSt, which also indicated that the obtained product was the final objective product.