将悬浮聚合与溶液聚合方法改性纳米TiO_2作了对比研究,探讨了介质和单体浓度对结果的影响,并对改性后纳米二氧化钛粒子的分散性能进行了分析.结果表明,在悬浮与溶液聚合条件下,在纳米TiO_2粒子表面均能形成聚合物包覆层,当单体浓度为0.25 g/mL时包覆率达最大值.TG表明与以水为介质相比,在乙醇中聚合物包覆率较大,但TEM表明包覆前的纳米粒子在乙醇中更易团聚,因此悬浮聚合条件下更利于聚合物在单个纳米粒子表面的吸附从而促进纳米粒子的分散.
Surface modification of TiO_2 nanoparticle by solution polymerization or emulsion polymerization of acrylate has been investigated extensively, but by in situ suspension polymerization of acrylate was rarely reported. The butyl acrylate suspension polymerization was discussed compared with solution polymerization in this paper. The influence of the medium and monomer concentration on the result was discussed, and dispersing performance of the surface modified TiO_2 nanoparticle was analyzed. The results showed that the TiO_2 nanoparticle was coated with the polymer successfully after polymerization, and the coating ratio was the highest when the concentration of monomer was 0.25 g/mL. TG test indicated that compared with the water, the ethanol used as medium wile result in higher coating ratio but more nano-particle aggregation(by TEM). Thus the suspension polymerization can help the absorption of the polymer on the surface of single nano-particle and promote the dispersing of nano-paritcle.
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