Structural relaxation in a low molecular weight poly(methylphenyl siloxane)

  • F. Stieber
  • G. Floudas
  • I. Alig
  • G. Fytas
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 91)


The results of dynamic light scattering, ultrasonic and dielectric measurements of a bulk poly(methylphenyl siloxane) with M W=1800 g/mol over a broad temperature and frequency range are reported. The temperature dependence of the reorientational relaxation times exhibit very fragile behaviour and indicates the decoupling of density and orientational relaxation times at temperatures higher than 1.2T g. This suggests a major contribution of volume structural rearrangements to longitudinal relaxation processes for this sample in the ultrasonic and hypersonic frequency region.

Key words

Reorientational relaxation longitudinal relaxation poly(methylphenyl siloxane) 


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Copyright information

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

Authors and Affiliations

  • F. Stieber
    • 3
  • G. Floudas
    • 1
  • I. Alig
    • 2
  • G. Fytas
    • 3
  1. 1.Max-Planck-Institut für PolymerforschungMainzFRG
  2. 2.Inst. Phys. Chem. University KölnKölnFRG
  3. 3.Foundation for Research and Technology-HellasHeraklion CreteGreece

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