高含量高透明度PS/TiO2纳米复合材料膜的紫外防护性能研究

采用溶剂热法非水合成了粒径小于20 nm的二氧化钛（TiO2）纳米粒子，并用硅烷偶联剂（KH 570）对纳米粒子进行原位修饰以提高粒子在聚苯乙烯（PS）的对二甲苯溶液中的分散性。采用旋涂法制备不同纳米TiO2粒子含量的PS复合材料膜，用紫外可见光光谱仪检测了薄膜的紫外防护性能。结果表明，纳米TiO2的最高含量达到95 %（质量分数，下同）；随着纳米TiO2粒子含量的增加，薄膜的紫外屏蔽性能逐渐增强，同时可见光区的透明度不会线性减少，而是趋于饱和，当纳米TiO2粒子含量达到95 %时，在人眼最敏感的550 nm波长处，依然可以获得82 %的透明度。

UV-protective Properties of Transparent Polystyrene/TiO2 Nanocomposite Films with High Particle Loadings

The anatase TiO2 nanoparticles with diameter of smaller than 20 nm were prepared in a nonaqueous sol-gel approach, which was modified with 3-(trimethoxysilyl)propyl methacrylate and dispersed in a PS solution in para-xylene. TiO2 containing solution was spin-coated to a film, in which the TiO2 contents was up to 95 wt %. UV-protective properties were examined by a UV-Vis spectrometer. The experiments indicated that the UV-protective property was enhanced with increasing TiO2 content. The transmittance of visible light became saturated, rather than linearly decreased. When the particle content was 95 wt %, the transmissivity was still higher than 82 %.