The temperature dependences of the proton spin-lattice, Tt, and spin-spin, T2, relaxation times of isotactic polypropylene films with different thermal histories and atactic fraction were investigated. A T~ minimum occurs for both melt-quenched and annealed samples at about 70ยฐC. It shifts to lower
Temperature dependence of the proton spin-spin relaxation time in liquid chloroform
โ Scribed by Dinesh; M.T. Rogers
- Publisher
- Elsevier Science
- Year
- 1971
- Tongue
- English
- Weight
- 254 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
The proton spin-spin rebxation time for liquid chloroform has been measured over the temperature range -54" to +9O"C. The values of Ta(H) decrease with increasing temperature contrary to the behavior obsemed for Tr (H). Values of Tz (I-l) calculated from experimental values of Tr (H) and Tz(Cl) reproduce the observed behavior satisfac-tOClY.
๐ SIMILAR VOLUMES
Proton spin-lattice, T~, and spin-spin, T 2, relaxation times of highly stretched isotactic polypropylene film were measured in the temperature range 40-110ยฐC. There is a monotonical increase in T~, when measured at 40ยฐC, as the stretching ratio is increased. A shorter T I, Tis, was observed for all
The magnetic field dependence of the water-proton spin-lattice relaxation rate (1/T(1)) in tissues results from magnetic coupling to the protons of the rotationally immobilized components of the tissue. As a consequence, the magnetic field dependence of the water-proton (1/T(1)) is a scaled report o
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