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Time-dependence of nuclear magnetic resonance quadrupole interactions for polymers under shear.

Authors
  • Atkin, J M
  • Cormier, R J
  • Callaghan, P T
Type
Published Article
Journal
Journal of magnetic resonance (San Diego, Calif. : 1997)
Publication Date
Jan 01, 2005
Volume
172
Issue
1
Pages
91–97
Identifiers
PMID: 15589412
Source
Medline
License
Unknown

Abstract

We consider the problem of performing NMR spectroscopy under conditions of flow, a central issue in Rheo-NMR. By way of example, the effects of rotational motion on the deuterium NMR spectrum are considered for Couette cell experiments involving deformation of polymers under shearing conditions. The polymer was modelled as a power law fluid and for each streamline, the spin Hamiltonian evolved to allow for flow reorientation. The gap-integral spectra are compared with the 'ideal' spectra for a polymer under shear, but without reorientation. It is found that flow does affect the shape of the deuterium spectra, as well as slightly perturbing the splittings.

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