Central Technological Library of the University of Ljubljana (CTK)
13.
Kinetic model of a methacrylate-based monolith polymerization
Mihelič, Igor, 1974- ...
Monolithic stationary phases are becoming more and more important in the filed fo liquid chromatography, because they enable extremly fast separations. Methacrylate-based monoliths are produced via a ...free-radiacal bulk polymerization of glycidyl methacrylate and ethylene dimethacrylate using a benzoyl peroxide as an iniatiator. Preparation of large monliths represents a big problem becouse of the heat release dduring the polymerization, which consequently leads to the distortion of the structure. A closer investigation of the polymerization, using differential scanning calorimetry, was performed in order to determine global kinetic parameters. A multiple heating rate method, based on the work of Ozawa, Flynn, and Wall, was applied for estimation of the values of the apparent activation energy, preexponential factor, and reaction order. Global polymerization kinetics is of first order with ▫$A=1.681x10^9s^{-1}$▫ and ▫$E_{a,app}$▫=81.5 kJ/mol, where polymerization is approximately 190 J/g. In addition, the influence of air and nitrogen atmosphere on polymerization is presented.
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