Molecular motion in polypropylene by proton spin-lattice relaxation
β Scribed by J.G. Powles; P. Mansfield
- Publisher
- Elsevier Science
- Year
- 1962
- Tongue
- English
- Weight
- 189 KB
- Volume
- 3
- Category
- Article
- ISSN
- 0032-3861
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π SIMILAR VOLUMES
Proton spin-lattice relaxation rate constants have been measured as a function of magnetic field strength for water, water-glycerol solution, cyclohexane, methanol, benzene, acetone, acetonitrile, and dimethyl sulfoxide. The magnetic relaxation dispersion is well approximated by a Lorentzian shape.
## Proton spin-lattice relaxation time constants (TV) have been found to range over more than an order of magnitude for coals of different rank'-'. Proposed relaxation mechanisms have included spin diffusion to paramagnetic centreslm3 or to rotating methyl groups5, and penetration of molecular ox