Abstract
The cure behavior of two dimethacrylate resin formulations activated by visible light (λ = 400–500 nm) was investigated by means of a rapid monitoring dynamic mechanical technique. Storage modulus (G′) and tan δ vs. time data were obtained for different light intensities (20–600 mW cm-2) and cure temperatures (25–60°C). Gelation and vitrification time were estimated from initial rise of G′ and maximum peak of tan δ vs. time curve, respectively, and used to construct time-temperature-intensity-transformation (TTIT) cure diagram. Physical states of material in the regions divided by the estimates of the transforming times were incorporated in the cure diagram. It was found that the dimethacrylate systems undergo phase transformation initially from liquid to rubber and finally to glass. Effects of intensity and temperature on the gelation and vitrification are discussed and compared for the two formulations.
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Lee, J., Choi, J. & Lim, B. Time-Temperature-Intensity-Transformation Cure Diagram for Visible Light Curable Dimethacrylate Resins. Polym J 35, 778–784 (2003). https://doi.org/10.1295/polymj.35.778
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DOI: https://doi.org/10.1295/polymj.35.778
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