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Solid state C‐13 NMR studies of a potential crosslinking agent for aliphatic polyester–urethane block copolymers
Author(s) -
Cholli Ashok,
Koenig Jack,
Sun Tong,
Zhou Hanxin
Publication year - 1983
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1983.070281114
Subject(s) - copolymer , polyester , polymer chemistry , materials science , acetone , diphenylmethane , polyurethane , carbon 13 nmr , solid state , block (permutation group theory) , chemistry , organic chemistry , polymer , composite material , catalysis , geometry , mathematics
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.