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Photooxidation of an MDI (Methylene 4,4'-Diphenyl Diisocyanate) Based Polyurethane Elastomer.
UNIVERSITY OF SOUTHERN MISSISSIPPI HATTIESBURG DEPT OF POLYMER SCIENCE
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The photolysis of a polyurethane elastomer based on methylene 4,4- diphenyl diisocyanate MDI in air and under vacuum results in the oxidation of primary photoproducts at relatively short irradiation times. The degree of crosslinked gel and the ultraviolet absorption spectra are both dependent on the presence of oxygen during the photolysis. Apparently, photolysis of the primary photoproducts probably photo-Fries type contributes to the degree of crosslinking generated upon photolysis. These results point out the complicated nature of one of the many reaction processes leading to the ultimate photogradation of MDI based polyurethanes.
APPROVED FOR PUBLIC RELEASE