纳米碳酸钙表面原位聚合包覆

In-situ Surface Polymerization Encapsulation of Nano-CaCO_3 Particle

通过超重力场制备了纳米碳酸钙，对纳米碳酸钙进行超声波分散，然后进行原位乳液聚合，采用分步聚合的方式，在纳米碳酸钙表面包覆了丙烯酸酯类共聚物，制得了纳米碳酸钙表面原位聚合包覆产物。采用TEM、DSC、TGA和表面电子能谱（ESCA）对纳米碳酸钙表面原位聚合包覆产物进行了表征。结果表明：制备的纳米碳酸钙粒子粒径在20nm左右，通过原位乳液聚合包覆后，粒径在40～80nm，包覆后的纳米碳酸钙复合粒子表面几乎不含Ca元素，表明纳米碳酸钙被良好包覆，并形成了以纳米碳酸钙为核、PBA为中间层、MMA和EA、St共聚物为壳的三层结构有机一无机纳米复合粒子。

The organic inorganic complex nano particles with core-shell structure were prepared by insitu emulsion polymerization based on fresh slush pulp of calcium carbonate （CaCO3） nanoparticles and acrylate polymer. The dispersion and encapsulation of nanoparticles were investigated by transmission electron microscopy （TEM）, DSC, TGA and electron spectroscopy for chemical analysis（ES- CA）. The results showed that in the presence of nano-CaCO3 particles, the in-situ emulsion polymeri- zation of acrylates was carried out smoothly, and polyacrylates successfully encapsulated on the surface of nano-CaCO3 particle to prepare the modified nanoparticles, breaking down nano-CaCO3 particle agglomerates.