• M. Hofmann, A. Herrmann, S. Ok, C. Franz, D. Kruk, K. Saalwächter, E. A. Rössler.
  Polymer Dynamics of Polybutadiene in Nanoscopic Confinement As Revealed by Field Cycling ¹H NMR.
  Macromolecules 44, xxx (2011). DOI 10.1021/ma2002504.

  Abstract

  Applying electronic field cycling ¹H NMR relaxometry we have investigated the segmental and collective dynamics of polybutadiene (M = 87 kDa) in bulk and in self-ordered aluminium oxide membranes with pore channel diameters of 60 nm and 20 nm over a broad temperature range (200 - 400 K). Although the confinement size is larger than the Flory radius, confinement effects have been found. The susceptibility spectrum of the collective polymer dynamics remains essentially the same in the accessible frequency range, however, the time scale of polymer dynamics slows down whereas that of segment dynamics remains unchanged. On the basis of the results we offer an alternative explanation of a phenomenon referred to as the corset effect introduced by Kimmich and co-workers.

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