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Neutron scattering experiments on the glass transition of polymers

Author

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  • Zorn, R.
  • Richter, D.
  • Frick, B.
  • Farago, B.

Abstract

Neutron scattering experiments have been performed to explore the dynamics of polymers near the glass transition. The experimental data show three distinct types of relaxations: 1.(1) Susceptibility spectra exhibit a contribution in addition to phonons around a temperature independent frequency.2.(2) Neutron-spin-echo (NSE) experiments show a slow relaxation of the stretched exponential type. Above 220 K, the characteristic time of this process strictly follows the Vogel-Fulcher dependence of viscosity data indicatings the direct connection between microscopic and microscopic relaxation.3.(3) Below 220 K, the temperature dependence of the relaxation observed by NSE changes to an Arrhenius form while the viscosity still follows the Vogel-Fulcher law. Analysis of the Q dependence from IN13 backscattering data reveals a change of mechanism at the crossover.

Suggested Citation

  • Zorn, R. & Richter, D. & Frick, B. & Farago, B., 1993. "Neutron scattering experiments on the glass transition of polymers," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 201(1), pages 52-66.
    • Handle: RePEc:eee:phsmap:v:201:y:1993:i:1:p:52-66
    DOI: 10.1016/0378-4371(93)90399-O
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    1. Thun, M.J. & Schober, S., 1991. "Urolithiasis in Tennessee: An occupational window into a regional problem," American Journal of Public Health, American Public Health Association, vol. 81(5), pages 587-591.
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    Cited by:

    1. Hansen, Jean-Pierre, 1993. "The kinetic glass transition: what can we learn from molecular dynamics simulations?," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 201(1), pages 138-149.

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