Abstract
AbstractMechanical properties such as tensile strength, relaxation modulus, creep compliance, and storage and loss moduli of UV‐curing ink systems were examined at various drying stages. Acrylic‐based binder consisting of epoxy acrylate prepolymer and trifunctional monomer were used as UV‐curing systems. For the UV‐cured specimen containing a large quantity of trifunctional monomer a highly crosslinked network structure was formed at comparatively short irradiation time, however, the sample lacks toughness and nonlinear rheological behavior was observed. On the other hand, for the specimen containing a large amount of epoxy prepolymer, a uniform network structure was formed and the ultimate strength increased with the growing network structure. In the temperature sweep experiments for storage and loss moduli, two transitions were observed. The transition observed above 10°C shifts to higher temperature and becomes broader with increasing irradiation time. The transition which is associated with a relaxation in the crosslinks was observed at −70°C and the height of the G″ peak increased with increasing irradiation time.
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