C-13-NMR SPECTROSCOPY STUDY OF POLYURETHANE OBTAINED FROM AZIDE HYDROXYL-TERMINATED POLYMER CURED WITH ISOPHORONE DIISOCYANATE (IPDI)

Chemical structure investigations of polyurethane binders based on dif unctional linear glycidyl azide polymer (GAP) cured with isophorone di isocyanate (IPDI) were performed using C-13-NMR spectroscopy in soluti on. Chemical functions such as urethane, urea, allophanate, and biuret were all expected to be detected in these polymeric binders. C-13-NMR assignment of the C=O urethane and urea functions were found in these polymers as determined by using model compounds of IPDI. The C-13-NMR data gathered in this article can be considered as basic parameters f or further characterization of polyurethane structure based on IPDI. A lso, C-13 CP MAS NMR spectra of GAP-IPDI-based polymers were carried o ut to identify the various chemical functions present in solid polyure thane elastomer. In addition, the curing evolution of a GAP-IPDI-based polymer at 50 and 80 degrees C in bulk was monitored, and the reactio n path of the binder was readily determined. Some conclusions on the e ffects of the cure catalyst and the curing temperature were also drawn . (C) 1997 John Wiley & Sons, Inc.