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The photoinitiated polymerization of multifunctional monomers has been monitored in real time by infrared spectroscopy. Conversion versus time curves have been directly recorded for polymerization occurring within seconds upon intense illumination. The influence on the polymerization kinetics of the photoinitiator, the monomer, and the functionalized oligomer has been quantified for acrylate monomers undergoing radical polymerization and for epoxy monomers undergoing cationic polymerization. Real-time infrared (RTIR) spectroscopy proved to be particularly well suited to follow the polymerization of monomer mixtures leading to the formation of either crosslinked copolymers or interpenetrating polymer networks. It was also used to study the UV curing of filled acrylate resins containing colored pigments or clay particles which generate nanocomposite materials. Up to a few millimeter thick samples were analyzed by near IR spectroscopy, by following continuously the disappearance of the acrylate double bond overtone band on UV-exposure. Real-time monitoring, sensitivity, short response time, and versatility are among the prominent advantages of this powerful tool of investigation.
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Christian Decker (2005) studied this question.
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