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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/063/01/0025-0032

    • Keywords

       

      Dynamics in glass-forming polymers; α-relaxation; fully atomistic molecular dynamics simulations; quasi-elastic neutron scattering

    • Abstract

       

      The combination of molecular dynamics simulations and neutron scattering measurements on three different glass-forming polymers (polyisoprene, poly(vinyl ethylene) and polybutadiene) has allowed to establish the existence of a crossover from Gaussian to non-Gaussian behavior for the incoherent scattering function in the α-relaxation regime. The deviation from Gaussian behavior observed can be reproduced assuming the existence of a distribution of discrete jump lengths underlying the sublinear diffusion of the atomic motions during the structural relaxation.

    • Author Affiliations

       

      J Colmenero1 2 3 A Arbe2 F Alvarez1 2 A Narros1 D Richter4 M Monkenbusch4 B Farago5

      1. Departamento de Física de Materiales UPV/EHU, Apartado 1072, San Sebastián - 20080, Spain
      2. Unidad Física de Materiales CSIC-UPV/EHU, Apartado 1072, San Sebastián - 20080, Spain
      3. Donostia International Physics Center, Apartado 1072, San Sebastián - 20080, Spain
      4. Institut für Festkörperforschung, Forschungszentrum, Jülich GmbH, Jülich - D-52425, Germany
      5. Institut Laue-Langevin, BP 156, Grenoble Cedex 9 - 38042, France

    • Dates

       
      Published
      July 2004

  • Pramana – Journal of Physics | News

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