三元添加剂水溶液体系制备CaCO3空心球

利用原位聚合方法, 通过加入一定量的引发剂使甲基丙烯酸原位聚合, 在三嵌段共聚物(P123)、聚甲基丙烯酸(PMAA)和十二烷基硫酸钠(SDS)的三元添加剂混合溶液体系中成功地制备了CaCO3空心球. 采用扫描电子显微镜(SEM)和X射线粉末衍射(XRD)对合成样品的形貌、结构进行了表征. 结果显示, 方解石CaCO3空心球直径约0.5-2 μm. 空心球壁由直径约25-35 nm的圆形粒子组成, 壁厚约100-300 nm. 利用核鄄壳机理解释了空心球结构的形成过程.

Preparation of CaCO3 Hollow Spheres in an Aqueous Ternary-Additive System

Well-defined CaCO3 hollow spheres were prepared easily in a triblock copolymer P123, poly methacrylic acid (PMAA) and sodiumdodecylsulfate (SDS) ternary-additive system combined by the in situ polymerization of MAA monomers through addition of a certain amount of initiator. The as-prepared products were characterized with scanning electron microscopy and X-ray diffraction. The results suggested that the sizes of the calcite hollow spheres ranged from 0.5 to 2 μm. The wall of the sphere was constituted of many small round particles with the diameter from 25 to 35 nm and the wall thickness from 100 to 300 nm. Moreover, the formation of the hollow spherical structure was interpreted in terms of the core-shell mechanism.