“…19a, 24 It has been reported that the DSC scans of several phenol-blocked urethanes, derived from MDI, show endothermic transitions due to deblocking reactions. 41 Anagnostou and Jaul 42 also reported the deblocking reactions of several blocked isocyanates of MDI using different blocking groups, such as caprolactam, MEKO, and benzotriazole, using DSC and IR spectroscopy. They also observed endotherms at temperatures ranging from 40 to 200°C depending on the blocking group.…”