Abstract
Abstract Proton spin-lattice and spin-spin relaxation in polymer solutions of polymethylmethacrylate in deuterated chloroform and polystyrene in carbontetracloride are reported. Measurements were performed with pulsed NMR as a function of concentration and molecular weight and for different measuring frequency υ vL . The experimental results are analysed in terms of segmental dynamics for polymer chains, on the basis of the q and ξ dependence of the decay rate of the excitations as predicted by the “blob” model of de Gennes. The relation between the NMR data and light scattering quantities is discussed and it is shown how NMR can be complementary to light scattering.
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