PREPARATION AND MICROSTRUCTURE OF POLYMER UNIFORM DISPERSIONS OF NANO-TiO_2/METHYLMETHACRYLATE
ZHANG Ye; ZHOU Guien; LI Lei; ZHANG Yuheng (Centre of Stuctural Analysis, University of Science and Technology of China,Hoti 230026)
A stable nano-Tio2 colloidal solution was prepared by using oleic acid with unsaturated double bonds and methylmethacrylate(MMA) as a suffoctant and an acetic solvent, respectivelythis dispersion of oleic acid coated nanoparticles of TiO2 within the polymer host (PMMA) was acquired by free-radical polymerization of polymerable oleic acid coated TiO2 colloidal solution. Experimental results show that in the polymer matrix there exists a crosslinked net, in which the nanoparticles are cores. The morphology, distributions and changes of nano-TiO2 particles with the concentration of Tio2 in the colloidal solution were systematically investigated in terms of TEM observations and ultraviolet-visible light absorption spectrum measurements. When the concentration of TiO2 in thecolloidal solutions CTiO2- 0.032%(in mol), the particle diameter distribution of TiO2 presents a narrow distribution (the particle diameter distribution range is 5 to 30nm.). When CTiO2 0.032%(in mol),the particles grow and their diameters are distributed in two size regions f 5～30nm and 50～180nm. In the solution with the oleic acid, the TiO2 particles are quasi-spheric, but in the solution without the oleicacid, the most of TiO2 particles are spheric.
【CateGory Index】： TB324