Preparation and Characterization of PMMA/nano-SiO_2 Nanocomposite

When nano-SiO 2 particles were treated with silane coupling agent(KH-570), the groups of CH CH 2 were grafted on the surface of nano-SiO 2 particles successfully. By using ultrasonic dispersing method, the nano-SiO 2 particles mixed with MMA and BPO were dissolved in solvents of ethyl acetate/toluene with the volume ratio of 1/1. PMMA/nano-SiO 2 nanocomposites were synthesized. The samples were characterized by DSC, TGA and Vis spcetroscopy. It was noted that the silica particles acted as crosslinking points in the PMMA matrix. The thermal stability and the glass transition temperature of the nanocomposites increased with the increasing of nano-SiO 2 amount. The transparences of PMMA/nano-SiO 2 nanocomposites, however, decreased with the increasing of nano-SiO 2 amount.