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Study of the glass transition order parameter in amorphous polybutadiene by incoherent neutron scattering

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Zeitschrift für Physik B Condensed Matter

Abstract

The temperature dependent elastic incoherent scattering from a glass forming polybutadiene was studied using high resolution neutron spectroscopy. This elastic scattering measures directly the non-ergodicity order parameter of the glass transition. We observed an anomalous decrease of this scattering setting in around 30 K below the thermodynamic glass transition,T g , the temperature dependence of which is in agreement with the square root ofT prediction of the mode coupling approach. The critical temperature of 220 K lies about 30 K aboveT g . The missing elastic intensity reappears as inelastic scattering in the 1 meV range. Within the μeV resolution of the backscattering spectrometer no quasielastic scattering can be detected up to 20 K aboveT g . The observed inelastic scattering may be interpreted as resulting from a continous shift of the density of states towards low frequencies as a consequence of a general softening of the structure.

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Authors and Affiliations

  1. Institut Laue-Langevin, Avenue des Martyrs 156X, F-38042, Grenoble, France

    B. Frick, D. Richter & W. Petry

  2. Institut für Festkörperforschung, Kernforschungsanlage Jülich, Postfach 1913, D-5170, Jülich 1, Federal Republic of Germany

    U. Buchenau

Authors
  1. B. Frick
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  2. D. Richter
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  3. W. Petry
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  4. U. Buchenau
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Frick, B., Richter, D., Petry, W. et al. Study of the glass transition order parameter in amorphous polybutadiene by incoherent neutron scattering. Z. Physik B - Condensed Matter 70, 73–79 (1988). https://doi.org/10.1007/BF01320541

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  • DOI: https://doi.org/10.1007/BF01320541

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