Nuclear Magnetic Resonance of Coating and Adhesive Systems
Published Online: 15 SEP 2006
Copyright © 2000 John Wiley & Sons, Ltd. All rights reserved.
Encyclopedia of Analytical Chemistry
How to Cite
Brandolini, A. J. 2006. Nuclear Magnetic Resonance of Coating and Adhesive Systems. Encyclopedia of Analytical Chemistry. .
- Published Online: 15 SEP 2006
The interaction of the magnetic moment of an atomic nucleus with a static magnetic field gives rise to nuclear magnetic resonance (NMR). Examination of NMR can reveal both the chemical structure and physical characteristics of a chemical system and this makes the technique particularly useful for the study of materials such as those encountered in coating and adhesive applications. No other spectroscopic technique can offer such a detailed description, both qualitative and quantitative, of molecular structure, including features such as stereochemistry, reaction kinetics and surface phenomena. Each nucleus has a distinct precession frequency, allowing different (e.g. 13C, 1H, 29Si) to be observed within a sample. The technique does, however, suffer from a few drawbacks. First, it is not a particularly sensitive technique, and it is most readily applied to features that constitute at least a few percent of the sample. Second, sample preparation can be difficult; this can be especially true for coatings and adhesives materials, as will be discussed. The most detailed chemical information is obtained from the spectra of liquids or solutions, which precludes cross-linked or cured materials. The spectra of solids, including cross-linked and cured materials, must be studied using complex experimental approaches, and these often suffer from poor resolution.