Abstract
The kinetics of curing of epoxidized sucrose soyate with a cycloaliphatic anhydride was studied using differential scanning calorimetry. Epoxidized sucrose soyate (ESS), a novel bio-based resin with high epoxy functionality, can be used to produce thermoset polymers for structural applications. ESS was cross-linked with methyl hexahydrophthalic anhydride using a zinc-based catalyst. Differential scanning calorimetry studies indicated that the reaction kinetics was influenced by the formulation variables, i.e., anhydride-to-epoxy molar ratio and catalyst amount. Multiple exothermic peaks suggest the presence of several different reaction mechanisms of the epoxy-anhydride reaction using metal complex catalyst, based on the formulation variables. All of the reaction rate data can be fitted into both n-th order and autocatalytic kinetic models. Based on the value of reaction order in the n-th order and autocatalytic kinetic model, the curing process is more dominated by non-autocatalytic reaction and less controlled by the autocatalytic process. This kinetic model observation suggested that the presence of hydroxyl groups or carboxylic acid pendant chains in the ESS molecule or as the product of side reactions did not autocatalyze the reaction, and the reaction is initiated solely from the metal complex.
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