Preparation of Sil-LMA Reversed Phase Chromatographic Stationary Phase byAtom Transfer Radical Polymerization and Its Chromatographic Properties

KeyWord:atom transfer radical polymerization  reversed phase liquid chromatography£¨RPLC£©  hydroxybenzene and amine compounds  chromatographic property

Abstract:

      Lauryl methacrylate£¨LMA£© was grafted on the surface of 5 ¦Ìm silica by atom transfer radical polymerization£¨ATRP£© using 2-bromoisobutyryl bromide as initiator and CuBr/2,2¡ä-bipyridyl£¨Bpy£© as catalytic system,and a novel Sil-LMA chromatographic stationary phase was obtained.The stationary phase was characterized by elementary analysis.Hydrophobic selectivity of the Sil-LMA was evaluated by using aromatic compounds as analytes and methanol-water as binary mobile phase.Effects of methanol content in the mobile phase and temperature on chromatographic property of the stationary phase were investigated.The chromatographic property of the stationary phase was evaluated using hydroxybenzene compounds and amine compounds as solutes,and parameters of kinetics and the thermodynamics were also determined.The amount of monomer was calculated to be 2.323 3 mg/m2 on the surface of silica.The results demonstrated that the stationary phase can effectively separate five hydroxybenzene compounds and five amine compounds in RPLC mode.Compared with that of C18 column under the same chromatographic conditions,the separation efficiency of the stationary phase was better,and the analysis time was shortened.The stationary phase possessed a good reversed-phase chromatographic behavior,which was found to be well consistent with reversed-phase retention mechanism.