Carbon-13 relaxation measurements were performed on vinyl chloride-vinylidene chloride copolymers in solution. The variations of T1 and nuclear Overhauser enhancement were analysed over a wide temperature range including Tx minimum. The data were analysed in terms of several motional models, including both correlation time distribution and diffusional models. Only those models that involve motion on two well separated time scales were successful. The slower motion corresponds to a damped diffusion along the chain; the faster motions are librations of limited extent about the rest position
Посилання на статтю:
Nuclear magnetic resonance investigation of the microdynamics of vinyl chloride-vinylidene chloride copolymers / Heike Menge* and Horst Schneider // Polymer. – 1993. – Vol 34. – P. 4208-4212.