POSS/TiO2 Nanohybrids as Sun Protection Factors for Skin Changes Caused by Ultraviolet A Radiation
Based on (3-methacryloxypropyl)-Polyhedral oligomeric silsesquioxane (MP-POSS) (MP), vinyl-POSS (VP), (3-glycidoxypropyl)-POSS (GP) and modified with 5, 10, 15, 20 and 25 wt-％ titanium tetrabutoxide (TTB), three hybrid nanofilms (f-MPT, f-VPT and f-GPT) were prepared using hydrolytic condensation and crosslinking. The transparency of the films was measured at the ranges of ultraviolet A (UV-A) (320-400 nm) spectrum which can cause a much greater risk of skin changes. The average transparency (AT) values of three films were about 65-78％ (320-350 nm) and 85-89％ (350-400 nm), which implies that these films indeed can provide a physical barrier for blocking the UV-A absorbed into the skin, indicating functionality of the POSS/TiO2 materials as the sun protection factor (SPF) ingredients in a sunscreen. 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.
Silsesquioxane (SSO) Thin Film Sun Protection Factor Ultraviolet A
Xiaodong CHEN Di WANG Xuandong LI Yu LIU Lijiang HU
School of Economic and management, Harbin Institute of Technology, Harbin 150001, China Chemistry Department, Harbin Institute of Technology, Harbin 150001, China Materials Science and Eng Chemistry Department, Harbin Institute of Technology, Harbin 150001, China
国际会议
重庆
英文
1039-1043
2008-06-09（万方平台首次上网日期，不代表论文的发表时间）