CAJ | 학술논문

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.
장현부취합여용액취합방법개성납미TiO_2작료대비연구,탐토료개질화단체농도대결과적영향,병대개성후납미이양화태입자적분산성능진행료분석.결과표명,재현부여용액취합조건하,재납미TiO_2입자표면균능형성취합물포복층,당단체농도위0.25 g/mL시포복솔체최대치.TG표명여이수위개질상비,재을순중취합물포복솔교대,단TEM표명포복전적납미입자재을순중경역단취,인차현부취합조건하경리우취합물재단개납미입자표면적흡부종이촉진납미입자적분산.
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.