ISSN:
0887-6266
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
1H-NMR and 2H-NMR spectra of water (H2O and D2O) absorbed in Visking cellulose tubing have been observed as a function of the angle Θ between the film surface and the magnetic field. 1H-NMR spectra show broad lines, and the chemical shift and the linewidth depend on Θ. From the angular dependence of the chemical shift, the anisotropic volume diamagnetic susceptibilities of the film are determined, i.e., χ∥ in the direction longitudinal to the tubing (stretched direction) is 0.43 ppm, and χ⊥ in the transverse direction is 0.57 ppm. The different values of χ∥ and χ⊥ afford an evidence of the anisotropy of the film. 2H-NMR spectra of D2O absorbed in the film show quadrupole splitting which also depends on Θ. The angular dependences of the linewidth (1H-NMR) and the quadrupole splitting (2H-NMR) indicate that the H—H axes of the water molecules have a tendency to orient in the direction longitudinal to the film surface.
Additional Material:
12 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/polb.1989.090271201
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