15N-NMR Spectroscopy. XVIII. Sequence Analysis of Linear Polyureas
- 1 August 1980
- journal article
- research article
- Published by Taylor & Francis in Journal of Macromolecular Science: Part A - Chemistry
- Vol. 14 (6) , 959-975
- https://doi.org/10.1080/00222338008068123
Abstract
Various homo- and copolyureas were prepared either by conversion of diamines with diisocyanates or by heating diamines with N, N'-bisphenoxycarbonyl diamines. The 13C-NMR spectra and the natural abundance 15N-NMR spectra were measured in trifluoroacetic acid. In contrast to polyamides, the carbonyl signals of polyureas are not sensitive to neighboring residue effects, so that 13C-NMR spectra are in most cases useless for the sequence analysis of copolyureas. The 15 N-NMR signals of urea groups are, however, sensitive to the influence of both substituents and thus contain information on the sequence. Structure/ shift-relationships are discussed, and 15 N-NMR spectra of various copolyureas are presented.This publication has 8 references indexed in Scilit:
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