Polystyrene Solutions: Characterization of Molecular Motional Modes by Spectrally Resolved Low‐ and High‐Field NMR Relaxation

Abstract

Abstract Polystyrene solutions in CDCl 3 were examined by different NMR techniques. Diffusion measurements and spectrally resolved frequency‐dependent 1 H longitudinal relaxation studies give some insight into the complex molecular motional modes and their frequency dependence, that is, the dispersion of the longitudinal relaxation rate. The newly available spectral resolution at low magnetic field around 20 MHz 1 H‐Larmor frequency additionally allows the differentiation of aliphatic and aromatic spectral contributions and, therefore, a more detailed description of the molecular mobility in the frequency range of several MHz compared to the well‐known time‐domain or field‐cycling NMR studies.