Laser Flash Photolysis of a Methylene 4,4'-Diphenyldiisocyanate (MDI) Based Polyurethane and Model Carbamates

摘要

Transient species in the laser flash photolysis of solutions of methylene 4,4'-diphenyldiisocyanate (MDI) based polyurethanes and small molecule models have been detected. One of the transient species, a substituted anilinyl radical, is not quenched by oxygen while a second transient is extinguished by the introduction of oxygen. Based on the spectral results, a plausible mechanism is offered for the primary photochemical reactions of MDI based polyurethanes.