Solid state C-13 NMR studies of a potential crosslinking agent for aliphatic polyester–urethane block copolymers
Article first published online: 9 MAR 2003
Copyright © 1983 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 28, Issue 11, pages 3497–3502, November 1983
How to Cite
Cholli, A., Koenig, J., Sun, T. and Zhou, H. (1983), Solid state C-13 NMR studies of a potential crosslinking agent for aliphatic polyester–urethane block copolymers. J. Appl. Polym. Sci., 28: 3497–3502. doi: 10.1002/app.1983.070281114
- Issue published online: 9 MAR 2003
- Article first published online: 9 MAR 2003
- Manuscript Accepted: 19 MAY 1983
- Manuscript Received: 7 FEB 1983
Solid state C-13 NMR was used to characterize the complex of diphenylmethane 4,4′-diisocyanate (MDI) with acetone oxime as a potential crosslinking agent (PCA) for the aliphatic polyester–urethane block copolymers. The formation of MDI from the PCA was followed by heating the sample at 150°C. The active hydrogen atoms on the hard segments of the block copolymers can be made to react with the diisocyanate groups of the regenerated MDI from the PCA at the elevated temperature for the crosslinking. The regeneration ofNCO groups is also noted by the appearance of the 2270 cm−1 band in the FT-IR spectrum of the heat treated PCA.