Kinetic and chemorheological modeling of the vitrification effect of highly reactive poly(urethane-isocyanurate) thermosets

The cure kinetics and chemorheology of a highly reactive poly(urethane-isocyanurate) was characterized by DSC and parallel plate rheometry. The cure kinetics were modeled with a modified autocatalytic approach. The relationship between the transition temperature (Tg) of the urethane and isocyanurate networks as a function of conversion was obtained with DSC analysis. Even at low curing temperatures (T < 70 °C), the viscosity increased sharply as...