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Kinetic studies of viscous dimethacrylates copolymenzed with reactive diluents are complicated
by the fact that both initial viscosity and monomer structure play important, and sometimes
competing, roles in the diffusion controlled kinetics of these photopolymerizations. However, one
can separate the effects of viscosity and monomer structure by utilizing a procedure that hydrogenates the C=C double bond and leaves a product that has the same viscosity but is
unreactive. By combining the hydrogenated species with the second constituent that remains
polymenzable, one can study the reactivity of each monomer in a medium that mimics the initial
viscosity of the copolymer system. Detailed kinetic studies utilizing this hydrogenation procedure
and photo differential scanning calorimetry (PDSC) are presented for the 50/50 wt% copolymerization of bis-GMA and TEGDMA. The results suggest that the high reactivity and
quick network formation of the bis-GMA constituent has a significant effect on the copolymer
kinetics.
