Abstract
In this contribution, we present results from a nuclear magnetic resonance (NMR) profiling study of drying polymer solutions using polyvinylpyrrolidone (PVP) as a model system. The careful evaluation of the experimental data reveals a surprising increase in the apparent transverse relaxation time of the water phase of the drying solution over the first few hours of drying (where usually a decrease would be expected). By using additional information obtained from diffusion-weighted profiles, we can explain this finding as the result of a strong reduction of the diffusion effect on the apparent relaxation time during this time interval. Understanding this effect provides a better basis for making optimal use of profiling NMR in drying studies and avoids possible misinterpretation on the data.
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Acknowledgments
F. Quero was funded by the 7th Framework EU Marie Curie Initial Training Network Dynacop (DYNamics of Architecturally Complex Polymers). Experimental help by Jens Schober, Andrea Sandor and Cornelia Willax in the NMR experiments is gratefully acknowledged as well.
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Nestle, N., Quero, F., Xu, Z. et al. Unusual Increase of Apparent Transverse Relaxation Times in NMR Profiling of a Drying Polymer Solution. Appl Magn Reson 45, 1311–1317 (2014). https://doi.org/10.1007/s00723-014-0600-0
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DOI: https://doi.org/10.1007/s00723-014-0600-0