POLYMER ENCAPSULATED PACKING MATERIAL FOR RESERVED PHASE LIQUID-CHROMATOGRAPHY

A series of polymer-encapsulated packing materials for reversed phase high-performance liquid chromatography was prepared by radical polymer ization of ethylstyrene and divinylbenzene with vinyl-modified silica in solutions. Some characteristics such as polymer structure, swelling propensity, residual silanols, column efficiency and retention proper ties were evaluated. Such material is easy to pack and yields high col umn efficiencies. Its superior performance for the separation of mixtu res of aromatic hydrocarbons, amino- and hydroxyl group containing com pounds are demonstrated by several examples.