基于反相微乳液法的改性纳米二氧化钛溶胶的制备与结构

以十六烷基三甲基溴化铵(CTAB)为乳化剂,丙烯酸(AA)为助乳化剂,甲基丙烯酸甲酯为油相,配合适量的水,构建反相(W/O)微乳液,研究了该微乳液体系的相行为。利用该微乳液体系,通过钛酸丁酯水解制备了纳米二氧化钛(TiO2)溶胶,并用γ-甲基丙烯酰氧基丙基三甲氧基硅烷对其进行改性,采用红外光谱和透射电镜对改性前后纳米TiO2的结构进行了表征。结果表明,当CTAB/AA质量比为2/3,形成的反相微乳液单相区最大。KH-570以化学键的形式接枝到纳米TiO2表面,改性纳米TiO2的平均粒径在10nm左右且分散均匀。

Study on the Preparation of Modified Nano-titania Sols Based on Reverse Microemulsion Method

Reverse microemulsion was prepared with cetyhrimethylammonium bromide （CTAB） as surfactant, acrylic acid （AA） as co-emulsifier, methyl methacrylate as oil phase and water. The phase behaviors and the optimum proportion of single phase microernulsion area were investigated. In the reverse mieroemulsion, modified nano-titania （nano-TiO2） sols were synthesized by the hydrolysis of tetrabutyl titanate with γ-methacryloxypropyl trimethoxy silane （KH-570） as modifying agent. The structure of obtained nano-TiO2 was characterized by FTIR and TEM. The results showed that the biggest mieroemulsion region was obtained when the mass ratio of CTAB to AA was 2/3. Furthermore, KH-570 was bonded on the surface of nano-TiO2 by chemical bonds, and the modified nano-titania showed a good dispersion with an average particle size of 10nm.