Advertisement

Dynamics of the α-relaxation in glass-forming polymeric systems. Study by neutron scattering and relaxation techniques

  • A. Arbe
  • A. Alegría
  • F. Alvarez
  • J. Colmenero
  • B. Frick
Chapter
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 91)

Abstract

The dynamics of the α-relaxtion in three glass-forming polymeric systems has been studied by means of quasielastic neutron scattering as well as by relaxation techniques. By using these techniques, we have covered a wide time-scale ranging from mesoscopic to macroscopic times (10−10–101 s). All relaxation data have been interpreted in terms of a Havriliak-Nagami relaxation function, Φ HN. Neutron scattering data were described in terms of a scattering law S(Q, ω) which was also built starting from Φ HN. The results obtained indicate that the dynamics of the α-relaxation in a wide timescale can be well described by means of the same spectral shape, i.e. the same Havriliak-Negami parameter values. Moreover, the Havriliak-Negami characteristic times deduced from the fitting of the experimental data can also be described using only one Vogel-Fulcher functional form. Then, this implies a self-consistent description of the dynamics of the α-relaxation obtained by very different probes.

Key words

Dyanmics of the α-relaxation glass transition glass-forming polymeric systems quasielastic neutron scattering relaxation techniques 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Richter D, Dianoux AJ, Petry W, Teixeira J (eds) (1989) Dynamics of Disordered Materials. Springer, BerlinGoogle Scholar
  2. 2.
    Ngai KL, Wright GB (eds) (1991) Proceedings of the International Discussion Meeting on Relaxations in Complex Systems held in Heraklion, Crete, Greece, June 1990, on Relaxations in Complex Systems, J Non-Crystalline Solids 131–133Google Scholar
  3. 3.
    Colmenero J et al. (1991) Phys Rev B 44:7321CrossRefGoogle Scholar
  4. 4.
    Alvarez F, Alegría A, Colmenero J (1991) Phys Rev B 44:7306CrossRefGoogle Scholar
  5. 5.
    Del Val JJ et al. (1989) Makromol Chem 190:7321Google Scholar
  6. 6.
    Alegría A et al., Phys Rev B, submittedGoogle Scholar
  7. 7.
    Colmenero J et al. (1992) Phys Rev Lett 69:478CrossRefGoogle Scholar

Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1993

Authors and Affiliations

  • A. Arbe
    • 2
  • A. Alegría
    • 2
  • F. Alvarez
    • 2
  • J. Colmenero
    • 2
  • B. Frick
    • 1
    • 2
  1. 1.Institute Laue-Langevin (ILL)GrenobleFrance
  2. 2.Departamento de Física de MaterialesUPV/EHUSan SebastiánSpain

Personalised recommendations