Non-Kramers' behavior of the chain local dynamics of PVC in dilute solution. Carbon-13 NMR relaxation study
✍ Scribed by E. I. Tylianakis; Photis Dais; F. Heatley
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 271 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0887-6266
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✦ Synopsis
SYNOPSIS
Carbon-13 spin-lattice, spin-spin relaxation times, and NOE values were measured as a function of temperature at two magnetic fields for poly(vinyl chloride) (PVC) in three solvents: chloroform, dioxane, and dimethyl sulfoxide. The relaxation data were interpreted in terms of chain local motions by using the bimodal time-correlation function of the Dejean-Laupretre-Monnerie (DLM) model. Using this model, the correlation times obtained in this study, as well as those from an earlier study in dibutyl phthalate and 1,1,2,2-tetrachloroethane did not follow a linear relationship with solvent viscosity. Instead, the chain local dynamics showed a 0.60 power dependence on solvent viscosity, indicating that PVC deviates from the hydrodynamic Kramers' theory.