Abstract
The kinetics of photopolymerization of glycidyl acrylate (GA) and glycidyl methacrylate (GMA) sensitized by radical and cationic initiators have been studied using a combination of photodifferential scanning calorimetry (PDSC) and Fourier Transform i.r. spectroscopy (FT-i.r.). PDSC analysis shows that GA has much higher reactivity than GMA when a typical radical photoinitiator, 2,2-dimethoxy-2-phenylacetophenone (DMPA), was used. No great difference in rate constants and activation energies between the two monomers, except the higher conversion of GA, was found for the cationic polymerization initiated by sulphonium salts. The results of FT-i.r. show that both double bond and epoxy ring are polymerized at the same time. For both radical and cationic initiating systems, photopolymerization kinetics are also studied as a function of initiator concentration.
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