TiO_2/聚丙烯酸酯光固化纳米复合薄膜的AFM表征

AFM Study on Titania-Polyacrylates Nanofilm Synthesized by Photopolymerization

用原子力显微镜(AFM)表征了反胶束溶胶-凝胶法光聚合原位合成的TiO2/聚丙烯酸酯纳米复合薄膜的表面形态,研究了热处理时间和紫外光照时间对复合薄膜表面形貌的影响.结果表明,热处理有助于TiO2粒子的生成和薄膜的致密化,但薄膜的表面粗糙度波动不大;延长紫外光照时间,可以促进TiO2粒子的生成,填补薄膜表面的微孔,降低表面粗糙度.相区平均尺寸为21.57～38.29 nm的无机TiO2粒子均匀分散在有机相基体中,得到的TiO2/聚丙烯酸酯纳米复合薄膜的表面粗糙度参数Ra、Rz和Ry分别为1.272～2.263 nm、4.324～16.69 nm和9.71～19.39 nm,表明所合成的纳米复合薄膜的表面粗糙度低、光滑平整.

Effects of the post-thermal treatment and UV irradiation time on the surface morphologies of the titania-polyacrylates nanofilm, synthesized by sol-gel process in Span85/ Tween80 reverse micelles and subsequent rapid photopolymerization, were studied by AFM. The results demonstrated that the irradiation time and the post-thermal treatment promoted the formation of TiO2 particles and the film densifying, but the roughness of the nanofilm changed little during post-thermal treatment, while got smaller as the irradiation time of UV irradiation was prolonged. The inorganic TiO2 particles were homogeneously distributed in the organic matrix with mean diameter of 21.57--38.29 nm; the surface roughness parameters R,, Rz and Ry of the inorganic/organic nanofilm were 1. 272--2. 263 nm, 4. 324--16.69 nm and 9.71-- 19.39 nm, respectively, indicating a flat and slippery surface of the nanofilm.