Deuterium NMR Spectra of Chain Mobility in Polyethylene

The deuterium NMR spectrum is basically the observation of the quadrupole coupling, q Q/h, where e is the electric charge, is the electric field gradient 

FIGURE 19.14 The 25-MHz spectra of polypropylene in 1,2,4-trichlorobenzene at 140°C. [Source Bovey (1988). By permission of Dr. Bovey and Academic Press.] 

Q is the quadrupole moment, and h is Planck s constant. The magnitude of the splitting may be described by 

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