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Transient entanglement behaviour in a poly(propylene glycole) melt: A field gradient NMR self-diffusion study

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Abstract

We report measurements of the temperature dependence of the self-diffusion of a poly(propylene glycole) in the melt. Two kinds of magnetic field gradient NMR are used: pulsed field gradient NMR with large field gradients and static field gradient NMR in a specially designed cryomagnet. The emphasis is put on large field gradients. The (true) longtime self-diffusion coefficients are compared with those calculated from normal-mode relaxation times in dielectric spectroscopy using the Rouse model. They agree very well. For temperature below about 270 K, a time-dependent self-diffusion coefficient appears which is an indication of anomalous diffusion. At 253 K we observe complete transient entanglement behaviour of the PPG melt. These results are discussed in comparison with dielectric and other experimental data.

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Author notes

  1. M. Appel

    Present address: Exxon Research and Engineering Company Annandale, 08801, New Jersey, USA

Authors and Affiliations

  1. Universität Leipzig Fakultät für Physik und Geowissenschaften, Institut für Experimentelle Physik I, Linnestraße 5, 04103, Leipzig, Germany

    M. Appel, G. Fleischer & J. Kärger

  2. Institut für Physikalische Chemie, Universität Mainz, Jakob-Welder-Weg 15, 55099, Mainz, Germany

    I. Chang

  3. Universität Dortmund Experimentelle Physik III, Postfach 500 500, 44221, Dortmund, Germany

    F. Fujara

  4. Institut für Angewandte Chemie, Rudower Chaussee 5, 12484, Berlin, Germany

    A. Schönhals

Authors
  1. M. Appel
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  2. G. Fleischer
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  3. J. Kärger
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  4. I. Chang
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  5. F. Fujara
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  6. A. Schönhals
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Appel, M., Fleischer, G., Kärger, J. et al. Transient entanglement behaviour in a poly(propylene glycole) melt: A field gradient NMR self-diffusion study. Colloid Polym Sci 275, 187–191 (1997). https://doi.org/10.1007/s003960050070

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  • DOI: https://doi.org/10.1007/s003960050070

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