title: Time-dependence of nuclear magnetic resonance quadrupole interactions for polymers under shear.
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.
authors.affiliation: MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington, New Zealand.
authors.forename: J M
authors.initials: JM
authors.lastname: Atkin
authors.forename: R J
authors.initials: RJ
authors.lastname: Cormier
authors.forename: P T
authors.initials: PT
authors.lastname: Callaghan
mesh_terms: D003903:Deuterium; D004867:Equipment Design; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation / Q000379:methods*; D011108:Polymers / Q000737:chemistry*; D012212:Rheology; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors
chemical_list: D011108:Polymers; D003903:Deuterium