Abstract
The kinetics of the esterification of two cycloaliphatic epoxy resins containing glycidyl and epoxy cylohexane group, separately was studied using methacrylic acid in presence of triethyl-amine. The reaction was performed as a function of temperature to determine various kinetics and thermodynamic parameters such as reaction order, reaction rate constant, activation energy, frequency factor, entropy, enthalpy and free energy of the reaction. The reaction order was determined to be 2 and reaction rate constant for the resin containing epoxy cyclohexane group was found higher than that containing glycidyl epoxy group. The reaction was not found to proceed after ∼76% conversion due to the formation of adduct between nitrogen of amine and hydrogen of hydroxyl group of esterified resin. The rate of esterification reaction studied using higher homologue of triethyl-amine (tripropyl- and tributyl-) was found lower than that by triethyl-amine and conversion of acid into ester was ∼80% and ∼83% for tripropyl- and tributyl-amine, respectively due to the steric accessibility of nitrogen atom of higher amine. Based upon these kinetic data a suitable reaction mechanism is proposed for the system.
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Srivastava, A., Rai, J.S.P. Effect of Tertiary Amines on Reactivity of Cycloaliphatic Epoxy Resins towards Methacrylic Acid. J Polym Res 12, 159–166 (2005). https://doi.org/10.1007/s10965-004-1863-1
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DOI: https://doi.org/10.1007/s10965-004-1863-1