A new model porous polymer bead, NKG, based on methacrylate ester/styrene copolymer and formation of secondary polymetric networks is presented. The use of this polymer as stationary phase in gas chromatog. was studied. NKG can effectively sep. various types of compounds such as hydrocarbons, alcs., halogenated hydrocarbons, amines, lower fatty acids, water in many organic mixtures, and inorganic gases. These new products show better chromatog. performance than the widely used porous polymer beads, such as Chromosorb Century, Porapak and home made GDX series, etc. This is due to the fact that NKG is a stationary liquid interpenetrating polymer networks. The polarity of porous polymer beads are characterized by Kovats Index of five organic compounds The secondary polymerisation increases the interaction of components and NKG through determination of adsorption enthalpy. The synthesis of ethylene glycol dimethylacrylate (EGDM) by transesterification is improved, the reaction time is reduced to 1.5 h from 8-10 h; both purity and yield of the product are greater than 95%.

Key words: GAS CHROMATOGRAPHY, STATIONARY PHASE, CROSSLINKING AGENT, POLYMERIZATION, TRANSESTERIFICATION, METHYLPROPENOIC ACID ESTER, MACROMOLECULAR CHEMISTRY, POROUS CARRIER