Determination of kinetic parameters of N-vinylpyrrolidone radical polymerization in water by Pulsed Electron Polymerization−Size Exclusion Chromatography (PEP−SEC)

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Propagation step of radical polymerization of N-vinylpyrrolidone (NVP) in aqueous solutions has been studied by a recently introduced method, Pulsed Electron Polymerization−Size Exclusion Chromatography (PEP−SEC). Propagation rate constants have been determined at various initial monomer concentrations and reaction temperatures. It has been shown that the kinetic data, their concentration dependence, activation energy (Ea) and preexponential factor (A) in the Arrhenius equation obtained by PEP−SEC are very similar to those obtained by the well-established Pulsed Laser Polymerization−Size Exclusion Chromatography (PLP−SEC). These results support the correctness of the new PEP−SEC technique, which is expected to have some advantages over the classical PLP−SEC, in particular by its applicability to studying polymerization in nontransparent systems and lack of any chemical initiators and can be developed into a method alternative or complementary to PLP−SEC.