A Novel Polymethyl Methacrylate (PMMA)-TiO_2 Nanocomposite and Its Thermal and Photic Stability

摘要

A new kind of polymethyl methacrylate （PMMA）-TiO2 nanocomposite was synthesized through polymerization. The thermal and photic stability of this PMMA-TiO2 nanocomposites were investigated. The as-prepared samples were characterized by scanning electron microscopy （SEM）, UV-Vis spectroscopy, differential thermal analysis （DTA） and the photo-induced weight loss. The results show that the photostability of the PMMA-TiO2 nanocomposite is higher than that of the pure PMMA under UV-light irradiation. The weight-loss of the pure PMMA reaches 30% after 300 h UV-irradiation, while the composite only 0.3% under the identical experimental condition. The glass transition temperature （Tg） of pure PMMA is only 80 ℃, while the Tg of the composite reaches 258 ℃. Compared with pure PMMA, the thermal stability of the composite is greatly enhanced.