| 초록 |
Polymethylsilsesquioxane (PMSQ) spheres are the most representative polysilsesquioxane spheres found in the commercial market. On the other hand, titania spheres are one of the most widely used inorganic UV absorbing (scattering) agents. Although PMSQ spheres have excellent properties as lubricants, fillers and related applications, these spheres do not absorb UV light in useful region. Titania spheres, although it has such a high refractive index suitable for screening UV light, are poorly miscible with organic materials. Therefore, it is expected that hybrid materials of PMSQ and titania would have very desirable properties as UV screening agents and fillers with good compatibility. In this study, spheres of hybrid titania and PMSQ were prepared from co-gelation of methyltrimethoxysilane (MTMOS), titanium (IV) bisammonium lactate (TBAL), and 3-aminopropyltrimethoxysilane. SEM images and NMR analysis indicated these two molecules actually co-gelled to form homogeneous hybrid materials in micrometer scales. The solar protection factor, however, was 1.6 that was lower than expected. In continuing experiments relationship between SPF and different structural factors are being investigated as well as incorporating UV absorbing silsesquioxanes. |
