Abstract
Nuclear magnetic resonance (NMR) spectroscopy is a most effective and significant method for observing the structure and dynamics of polymer chains both in solution and in the solid state. In the solid state, where the motions of the chains are relatively slow, the resonances are broad owing to the local dipolar field at each observed nucleus. This phenomenon of dipolar broadening (see Section 17.2.3.1) tends to abolish all structural information. In solution, where chain motion is fast (Chapter 18), this effect is averaged nearly to zero and one may obtain detailed structural information. This chapter deals with solution NMR spectroscopy. Corresponding information may be obtained — mainly by 13C spectroscopy — for the solid state by ‘magic angle’ NMR (Chapter 19), although with substantially decreased resolution.
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