Based on Based on (3-methacryloxypropyl)-silsesquioxane (MP-SSO, MS) and modified with various amounts of titanium tetrabutoxide (TTB), hybrid films, film-MS-SSO-TTB (f-MST), were prepared using hydrolytic condensation and crosslinking. The average absorbance (AA) of the modified films is about 10-11 % in the ranges of Ultraviolet B (UV-B, 280-320 nm) and 50-78 % in the ranges of Ultraviolet A (UV-A, 320-400 nm), which implies that these films indeed can provide a physical barrier for blocking the UV () absorbed into the skin. The AT values of three films were in the order of f-MPT>f-GPT>f-VPT due to complete-cage structures of building blocks (POSS) and the size of organic branches covalently bonded to the silica network in the molecular structures. This indicates that VPT powder might be significantly better to selected for the SPF. The TTB addition results in the hybrid structure containing TiO2 which causes a decrease in the AA radiation from sunlight. Lower transparency of the films containing 25 wt-% TTB fractions is ascribed to more amounts of TTB in the modified films. Both TEOS and TTB adequate additions resulted in a hybrid structure (containing SiO2 and TiO2), and an addition can cause an increase in the AT radiation from sunlight. However, the AT of f-MSTE is higher than that of f-MSTT, which was validated using molecular dynamic simulation and calculation of the states density and the energy-band structure of MPMS-SSO, SiO2 and TiO2 building blocks.

Ultraviolet absorbance of (γ-methacrylpropyl)-silsesquioxane films modified with titanium tetrabutoxide and its validation by computing energy-band structure

244th National Meeting (2012)

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