Based on (3-glycidoxypropyl)-silsesquioxane (GP-SSO, GS) and modified with various amounts of tetraethoxysilane (TEOS) and titanium tetrabutoxide (TTB), two hybrid films, film-GS-SSO-TEOS (f-GSTE) and film-GS-SSO-TTB (f-GSTT), were prepared using hydrolytic condensation and crosslinking. The average absorbance (AA) of the modified films is about 10-13 % in the ranges of Ultraviolet B (UV-B, 280-320 nm) and 50-75 % 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 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-GMTE is higher than that of f-GMTT, which was validated using molecular dynamic simulation and calculation of the states density and the energy-band structure of GPMS-SSO, SiO2 and TiO2 building blocks.

Transparency and absorbance of the SiO<sub>2</sub>/TiO<sub>2 </sub>modified (γ-glycidoxypropyl)-silsesquioxane films and its validation by computing method

244th National Meeting (2012)

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Transparency and absorbance of the SiO2/TiO2 modified (γ-glycidoxypropyl)-silsesquioxane films and its validation by computing method

Transparency and absorbance of the SiO₂/TiO₂modified (γ-glycidoxypropyl)-silsesquioxane films and its validation by computing method