Experimental analysis and modeling of an acrylic thermoplastic resin polymerization: Influence of reactive mixture composition on temperature dependent kinetics
Résumé
Managing the in-situ polymerization of reactive thermoplastic mixtures represents a key challenge for the manufacture of thick composite parts. In particular, the highly exothermic free-radical polymerization of methyl methacrylate (MMA) exhibits complex kinetic phenomena, including the Trommsdorff effect, which arises from diffusional limitations. In this work, the reaction kinetics of Elium® C195E reactive mixtures were investigated by differential scanning calorimetry (DSC) under various isothermal and non-isothermal conditions. Power- compensated DSC and low-mass samples ensured minimal temperature rise caused by the exothermic nature of the reaction, thus enabling the polymerization to be analyzed from a purely kinetic angle. By varying the nature and initial quantity of peroxide initiators, the influence of the available active chain amount on the occurrence and intensity of the various polymerization phases could be highlighted. With a view to processing optimization, a time and temperature dependent kinetic model was then developed to simulate the reaction rate of this acrylic resin initiated by 3 different organic peroxides. Based on the reaction scheme, this semi-empirical modeling approach yields highly accurate predicting results and enables to account for the occurring phenomena during MMA polymerization in isothermal ([343–383] K) and dynamic conditions ([1–20] K. min 1). This model therefore provides valuable support for the manufacture of Elium® matrix composites and thus limits issues resulting from medium overheating.
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