The transverse magnetic relaxation of protons linked to entangled polyethylene oxide chains is shown to be strongly related to the existence of a mean entanglement spacing. This is reflected by the residual spin-spin interaction which results from nonisotropic rotations of monomeric units. This standard NMR parameter is derived from a specific treatment of the relaxation; it is shown to be both independent of the chain molecular weight and proportional to the polymer concentration as expected from viscoelastic measurements.
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Addad et al. (1995) studied this question.
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