Fabrication of monodisperse hollow silica spheres and effect on water vapor permeability of polyacrylate membrane
Fabrication of monodisperse hollow silica spheres and effect on water vapor permeability of polyacrylate membrane
复制标题
单分散二氧化硅空心球的制备及其对聚丙烯酸酯膜水蒸气透过率的影响
DOI：
10.1016/j.jcis.2013.06.045
复制
发表时间：
2013-10-01
影响因子：
9.9
通讯作者：
Ma, Jianzhang
中科院分区：
文献类型：
--
作者：
Bao, Yan;Yang, Yongqiang;Ma, Jianzhang
Polystyrene/silica core-shell spheres were fabricated using polystyrene as templates by hydrolysis and condensation of tetraethyl orthosilicate through a sol-gel process, in which polystyrene was synthesized by emulsion polymerization. Then, hollow silica spheres were obtained after selective removal of the organic polystyrene core from the polystyrene/silica core-shell spheres by tetrahydrofuran etching. The effect of hollow silica spheres on water vapor permeability, mechanical property, and water uptake of polyacrylate membrane were investigated. The microstructure analysis shows that the mean size and wall thickness of hollow silica spheres are 170 nm and 20 nm, respectively. The silica shells consist of amorphous silica seed assembly with a broad size distribution, which roughen the surfaces of hollow silica spheres greatly. The specific surface area of hollow silica spheres is bigger than that of polystyrene/silica core-shell spheres. Hollow silica spheres can significantly improve water vapor permeability of polyacrylate membrane, but lead to the reduction in mechanical property. (C) 2013 Elsevier Inc. All rights reserved.
