ISSN:
0887-6266
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
1H- and 2H-NMR spectra of water (H2O and D2O) and methanol (CH3OD and CD3OH) absorbed in cellulose triacetate films have been observed as a function of the angle θ between the film surface and the magnetic field. 1H-NMR signals of H2O and CH3OD are doublets and triplets due to dipole interactions, respectively. 2H-NMR signals of D2O, CD3OH, and CH3OD are doublets due to quadrupole splittings. The magnitudes of these splittings change depending on θ. The analysis of the angle-dependent patterns indicates that the motionally averaged axes of the dipole and the quadrupole moments orient in the direction perpendicular to the film surface. The alignment of water and/or methanol molecules originates from the film morphology, which is anisotropic in the perpendicular direction. From the angle dependence of the chemical shift, the volume diamagnetic susceptibility of the film is estimated to be 0.44 ppm.
Additional Material:
9 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/polb.1988.090261102
