摘要
以钛酸正丁酯为原料,通过水解法制备TiO2醇溶胶,将TiO2醇溶胶分散于聚醋酸乙烯酯(PVAc)-丙酮溶液中,得无色透明的纳米TiO2/PVAc复合溶胶,将溶胶刮涂制膜,得无色透明的TiO2/PVAc复合膜.用透射电镜观察,TiO2颗粒在PVAc中分布均匀,形态一致.激光粒度分析仪分析表明,TiO2颗粒在PVAc中粒径在25～30 nm范围内,密度平均31.3 nm、体积平均27.5 nm、数均25.3 nm .Zeta电位值为-55.1 mV.X-射线衍射分析表明,复合膜中2θ为10°～20°和20°30°出现两个宽峰,为无定型的特征.拉曼光谱在631.85 cm-1、522.56 cm-1、393.70 cm-1等处出现TiO2的特征峰.并对TiO2/PVAc复合溶胶进行紫外吸收测试,结果显示,与纯PVAc溶液相比,最大吸收峰发生蓝移5.4 nm,且吸光度增大了2.75倍.
The TiO_2 alcosol was obtained by n-butyl titanated hydrolysis action. The colorless transparent nano-TiO_2/ PVAc(polyvinyl acetate)sol has been prepared by dispersing TiO_2 alcosol to PVAc-actone solution, and the colorless transparent nano-TiO_2/PVAc film was obtained by painting . TEM observation shows TiO_2 particles have the same morphology in the hybrid material, and have been dispersed equably. Zetasizer indicates that range is 25 ~ 30 nm. TiO_2 particles in the hybrid material has the mean of 31.3 nm peak analysis by intensity, 27.5 nm by volume, and 25.3 nm by number. Two wide peaks (2 θ = 10°~20° and 20°~30°) have been discovered in X-ray diffraction spectrum. Raman spectrum indicates three peaks at 631.85 cm -1 、522.56 cm -1 and 393.70 cm -1 . Ultra-violet light absorption spectrum shows there is an absorption band at 345.6 nm (absorbance 0.035) in PVAC, but the absorption band shifts to 340.2 nm (absorbance 0.131) in TiO_2/PVAc. It is found that the absorbancy increase with the content of TiO_2.
基金
国家自然科学基金资助项目(20471002)
安徽省教育厅科研基金资助项目(2004kj034zd)
