Cross-linking behavior of UV-curable acrylate resins
Within this study the effect of the concentrations of oligomer, reactive diluent and photoinitiator on the cross-linking characteristics of UV-curable urethane acrylate polymers was analyzed applying dielectric analysis (DEA), Attenuated Total Reflectance Spectroscopy (ATR spectroscopy) and Dynamic Mechanical Analysis (DMA). Real-time cure monitoring by DEA provided fundamental information on the progress of polymerization and polymerization rate. A significant effect of the ambient temperature on the curing characteristics was discernible. An influence of the concentrations of photoinitiator and reactive diluent on the curing rate and time was not observable. After a curing time of 230 seconds the various resin formulations exhibited degrees of cure between 0.96 and 0.99. ATR spectroscopy ascertained that the degree of conversion on the surface exposed to air during the curing process is enhanced by increased photoinitiator concentrations. DMA revealed glass transition temperatures between 16 and 21°C for the different materials.
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