Rheologica Acta

, Volume 51, Issue 5, pp 385–394

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

Authors

    • Department of Chemical and Biochemical EngineeringTechnical University of Denmark
  • Kell Mortensen
    • Department of Basic Sciences and Environment, Faculty of Life SciencesUniversity of Copenhagen
  • Anders Bach
    • Department of Chemical and Biochemical EngineeringTechnical University of Denmark
  • Kristoffer Almdal
    • Department of NanotechnologyTechnical University of Denmark
  • Henrik Koblitz Rasmussen
    • Department of Mechanical EngineeringTechnical University of Denmark
  • Wim Pyckhout-Hintzen
    • Jülich Centre for Neutron Science-1 & Institute for Complex SystemsForschungszentrum Jülich
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

Scattering Polymer melt Uniaxial extension Polystyrene

Copyright information

© Springer-Verlag 2012