纳米二氧化钛的原位有机表面改性及性能  

Surface Modification in Situ and Characterization of Nano-sized TiO_2

作　　者：潘卉[1] 肖莎莎[2] 赵甜[2] 吴志申[2] 

机构地区：[1]河南大学化学化工学院,河南开封475004 [2]河南大学特种功能材料教育部重点实验室,河南开封475004

出　　处：《河南大学学报（自然科学版）》2012年第3期267-273,共7页Journal of Henan University:Natural Science

基　　金：河南省教育厅自然科学研究项目(2009B150004)

摘　　要：低温条件下通过控制TiCl4水解制备出金红石型的纳米TiO2,通过原位表面修饰的方法制备了十二烷基水杨酸(DASA)表面改性的纳米TiO2(TiO2/DASA).分别采用傅立叶红外光谱仪(FT-IR)、X射线衍射仪(XRD)和热分析仪(TGA)对表面改性前后的纳米TiO2进行了表征.通过透射电子显微镜(TEM)和分散稳定性实验分析,DASA能有效改善纳米TiO2在有机介质中的分散性能.在丙烯酸树脂中加入DASA改性的纳米TiO2,并进行超声波分散和成膜,获得了含不同比例纳米TiO2的丙烯酸树脂复合薄膜.原子力显微镜(AFM)分析结果表明DASA表面改性的纳米TiO2在丙烯酸树脂中分散性好,且纳米微粒的引入显著改变了树脂薄膜的表面形貌.对制得的纳米复合涂膜进行紫外—可见吸收光谱分析,结果表明,随着纳米TiO2含量的增加,纳米复合涂膜对紫外光的吸收呈上升趋势,抗紫外线性能增强.The rutile TiO2 nanoparticles were prepared by controlled hydrolysis of a titanium tetrachloride （TiCI4） precursor at temperature below 80℃. The TiO2 nanoparticles were surface modified with dodecyl salicylic acid （DASA） at 80℃ via an in situ method. As obtained TiO2 nanoparticles were characterized by Fourier transform infrared spectroscopy （FT-IR）,X-ray diffraction pattern （XRD） and thermogravimetric analyses （TGA）. It was found that DASA was successfully bonded to the surface of TiO2 nanoparticles during the surface modifying process, resulting in increased dispersibility of TiO2 nanoparticles in various organic solvents. Transmission electron microscope （TEM） and UV-vis spectroscopy showed the increased dispersibility of the surface-modified TiO2 nanoparticles with DASA in organic solvents. The DASA-modified nano-TiO2 particles were added into acrylate resin, and dispersed ultrasonically to obtain the different percentage of nano-TiO2 composite of acrylic resin. Atom force microscope （AFM） images showed the improved dispersibility of DASA-modified TiO2 nanoparticles doped an acrylic resin, compared with bare TiO2 nanoparticles. Besides, surface-capped TiO2 nanoparticles significantly influence the surface appearance of the composite thin film. The film with different percentage of nano-TiO2 was characterized by ultraviolet speetrophotometer （UV）. The results indicate that the nano-composite coatings take on the ascending trend of UV adsorption in some definite fields with the increase of nano-TiO2, therefore it is able to greatly resist the UV degradation of the thin film of different content nano-TiO2 doped an acrylic resin.

关 键 词：纳米二氧化钛 表面改性 可分散性 丙烯酸树脂 抗紫外光性能 

分 类 号：O614[理学—无机化学]