Accession Number : ADA267308


Title :   Photodegradation of MDI Based Polyurethane/Urea Elastomers


Descriptive Note : Technical rept. no. 17


Corporate Author : UNIVERSITY OF SOUTHERN MISSISSIPPI HATTIESBURG DEPT OF POLYMER SCIENCE


Personal Author(s) : Hoyle, C E ; Shah, H ; Moussa, K ; Berry, P ; Rufus, I B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a267308.pdf


Report Date : 13 Jul 1993


Pagination or Media Count : 4


Abstract : A series of polyurethane urea and polyurea elastomers based on MDI, a chain extender such as ethylene glycol or ethylene diamine, and polyethylene glycol oligomers or amine end capped modified polyethylene glycol oligomers were synthesized and characterized. Photodegradation of these polymers was monitored by UV and IR spectroscopy. A review of two systems, a polyurethane urea and a polyurea, is described in depth. Formation of photo-Fries product is observed in both the systems, although the pure polyurea exhibits a greater magnitude of change in the ultraviolet absorption spectrum.


Descriptors :   *ULTRAVIOLET RADIATION , *POLYURETHANE RESINS , *PHOTODEGRADATION , INFRARED SPECTROSCOPY , PHYSICAL PROPERTIES , STRUCTURAL PROPERTIES , POLYMERS , MOLECULAR WEIGHT , OLIGOMERS , POLYETHYLENE , UREA , ETHYLENE GLYCOL , SYNTHESIS(CHEMISTRY) , ELASTOMERS , AMINES , ULTRAVIOLET SPECTROSCOPY , CHAINS , ABSORPTION


Subject Categories : Polymer Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE