Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9594234 | Solid State Nuclear Magnetic Resonance | 2005 | 8 Pages |
Abstract
Geometry and time scale of structural relaxation of poly(n-alkylmethacrylates) above the glass transition is studied by temperature dependent one- and two-dimensional 13C-NMR spectroscopy. The geometry of the isotropization of the polymer backbone as deduced from detailed analysis of spectral line shapes is identified as random angular jumps. Analysis of echo decays confirms that at a given temperature this isotropization can adequately be described with a single correlation time. The results are discussed in terms of conformational memory and local structure recently identified in these polymeric glasses.
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Authors
Michael Wind, Lothar Brombacher, Andreas Heuer, Robert Graf, Hans Wolfgang Spiess,