1H NMR spectroscopy of polymers under shear and extensional flow |
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| Authors: | P T Callaghan A M Gil |
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| Institution: | (1) Institute of Fundamental Sciences-Physics Massey University Palmerston North, New Zealand e-mail: p.callaghan@massey.ac.nz, NZ;(2) Department of Chemistry University of Aveiro, P-3810-193 Aveiro Portugal, PT |
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| Abstract: | We discuss the potential insights gained from 1H nuclear magnetic resonance (NMR) spectroscopy experiments on polymeric systems under both shear and extension, and we show
in particular that 1H spin-spin relaxation is sensitive to both molecular conformation and to molecular interactions. Rheo-NMR 1H spectroscopy studies on semi-dilute solutions of polyacrylamide demonstrate that the chain protons exhibit a marked T
2 reduction under shear and that the recovery on shear cessation is indicative of slow reorganisational dynamics. Studies of
the wheat flour protein, gluten, indicate marked spectroscopic changes in the vicinity of the amidic resonances associated
with glutamine residues, an effect we attribute to the disruption of hydrogen bonding.
Received: 23 June 1999/Accepted: 23 August 1999 |
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| Keywords: | Rheo-NMR Polyacrylamide Gluten Shear Extension |
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