Continuous Flow Reaction for the Polymerization of Epoxy Monomer with Structurally Varied Latent Thermal Initiators
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Cationic polymerization is widely employed for the polymerization of epoxy monomer which is extremely exothermic and therefore, the reaction in batch is often uncontrollable. To address this problem, we explored a continuous flow reaction to effectively control the copolymerization with sulfonium-type thermal latent initiators of which the chemical structure was systematically varied for tuning initiator activation and initiation reactions. With the flow reaction geometry, kinetic studies of the cationic polymerization of glycidyl phenyl ether were performed at different temperature. We found that conversion was reliably regulated, which is not the case in the batch reaction that was extremely rapid and violent. The relationship between the chemical structure of the latent initiator and polymerization behavior was successfully elucidated in the continuous flow reaction geometry, highlighting its potential to regulate the cationic polymerization even at elevated temperature.