Proton magnetic resonance spectroscopy theory

L. Xie, H. Liu, S. Han, B. Yue, L. Yan, Hydrogen bond and proton transport in acid-base complexes and amphoteric molecules by density functional theory calculations and H and P nuclear magnetic resonance spectroscopy, J. Phys. Chem. B 117 (2013) 16345-16355. 

Nuclear magnetic resonance (NMR) spectroscopy of polymers in solution is a very important method of studying polymer configuration since noncrystalline as well as crystalline compounds can be studied. The method depends on the fact that the chemical shift of the signals of bonded hydrogen atoms (protons), and atoms, etc., in fixed chemical environments depends on the configuration of the main chain. In theory, the technique represents an absolute method, but, on technical grounds, it can often only be used as a relative method. An example of this is the analysis of the spectra of poly(methyl methacrylates) of various tacticities. 

Nuclear magnetic resonance (NMR) spectroscopy is one of the most useful methods for the study of degradation (chain scission and crosslinking) and photo-oxidative degradation (disappearance and the formation of new groups which contain protons deutrons carbon C isotopes and fluors The theory of NMR spectroscopy of polymers and experimental methods have been described in many excellent monographs [5,6,295,608,1206,1223, 1327,1699,1885,2064,2111,2221]. 

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