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

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...

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Bibliographic Details
Published in:	Journal of magnetic resonance (1997) 2005-01, Vol.172 (1), p.91-97
Main Authors:	Atkin, J.M., Cormier, R.J., Callaghan, P.T.
Format:	Article
Language:	eng
Subjects:	Deuterium Equipment Design Magnetic Resonance Spectroscopy - instrumentation Magnetic Resonance Spectroscopy - methods Molecular alignment Polymer Polymers - chemistry Rheo-NMR Rheology Signal Processing, Computer-Assisted Time Factors
Online Access:	Get full text
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Summary:	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.
ISSN:	1090-7807 1096-0856