Synthesis of Vinyl Ester Resins in the Presence of Monoepoxies: A Kinetic Study

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Abstract
The synthesis of vinyl ester resins V1, V2, and V3 was carried out using bisphenol-A–based epoxy resin and acrylic acid in presence of phenyl, cresyl, butyl, and glycidyl ethers, respectively, as reactive diluent and triphenylphosphine as catalyst. The reaction was performed at 70°, 75°, 80°, 85°, and 90°C and it followed the first-order kinetics. The specific rate constants, calculated by the regression analysis, were found to obey Arrhenius expression. The kinetic and thermodynamic parameters activation energy, frequency factor, entropy, enthalpy, and free energy revealed that the reaction was spontaneous and irreversible with highly ordered activated complex. The activation energy of the esterification of epoxy resin in presence of monoepoxy diluents increases in this order: V1<V2<V3. The experimental results were explained by proposing a reaction mechanism and deriving the rate equation.

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