Rheologica Acta

, Volume 51, Issue 5, pp 385–394

Stress and neutron scattering measurements on linear polymer melts undergoing steady elongational flow

  • Ole Hassager
  • Kell Mortensen
  • Anders Bach
  • Kristoffer Almdal
  • Henrik Koblitz Rasmussen
  • Wim Pyckhout-Hintzen
Original Contribution

DOI: 10.1007/s00397-012-0622-1

Cite this article as:
Hassager, O., Mortensen, K., Bach, A. et al. Rheol Acta (2012) 51: 385. doi:10.1007/s00397-012-0622-1

Abstract

We use small-angle neutron scattering to measure the molecular stretching in polystyrene melts undergoing steady elongational flow at large stretch rates. The radius of gyration of the central segment of a partly deuterated polystyrene molecule is, in the stretching direction, increasing with the steady stretch rate to a power of about 0.25. This value is about half of the exponent observed for the increase in stress value σ, in agreement with Gaussian behavior. Thus, finite chain extensibility does not seem to play an important role in the strongly non-linear extensional stress behavior exhibited by the linear polystyrene melt.

Keywords

ScatteringPolymer meltUniaxial extensionPolystyrene

Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Ole Hassager
    • 1
  • Kell Mortensen
    • 2
  • Anders Bach
    • 1
  • Kristoffer Almdal
    • 3
  • Henrik Koblitz Rasmussen
    • 4
  • Wim Pyckhout-Hintzen
    • 5
  1. 1.Department of Chemical and Biochemical EngineeringTechnical University of DenmarkKgs. LyngbyDenmark
  2. 2.Department of Basic Sciences and Environment, Faculty of Life SciencesUniversity of CopenhagenFrederiksberg CDenmark
  3. 3.Department of NanotechnologyTechnical University of DenmarkKgs. LyngbyDenmark
  4. 4.Department of Mechanical EngineeringTechnical University of DenmarkKgs. LyngbyDenmark
  5. 5.Jülich Centre for Neutron Science-1 & Institute for Complex SystemsForschungszentrum JülichJülichGermany