Rheologica Acta

, 49:1 | Cite as

Planar elongation of soft polymeric networks

  • Mette Krog Jensen
  • Ole Hassager
  • Henrik Koblitz Rasmussen
  • Anne Ladegaard Skov
  • Anders Bach
  • Henning Koldbech
Original Contribution

Abstract

A new test fixture for the filament stretch rheometer (FSR) has been developed to measure planar elongation of soft polymeric networks with application towards pressure-sensitive adhesives (PSAs). The concept of this new geometry is to elongate a tube-like sample by keeping the perimeter constant. To validate this new technique, soft polymeric networks of poly(propylene oxide) (PPO) were investigated during deformation. Particle tracking and video recording were used to detect to what extent the imposed strain rate and the sample perimeter remained constant. It was observed that, by using an appropriate choice of initial sample height, perimeter, and thickness, the planar stretch ratio will follow \(\lambda(t) = h(t)/h_0= \exp({\dot{\varepsilon}} t)\), with h(t) being the height at time t and \({\dot{\varepsilon}}\) the imposed constant strain rate. The perimeter would decrease by a few percent only, which is found to be negligible. The ideal planar extension in this new fixture was confirmed by finite element simulations. Analysis of the stress difference, σzz − σxx, showed a network response similar to that of the classical neo-Hookean model. As the Deborah number was increased, the stress difference deviated more from the classical prediction due to the dynamic structures in the material. A modified Lodge model using characteristic parameters from linear viscoelastic measurements gave very good stress predictions at all Deborah numbers used in the quasi-linear regime.

Keywords

Filament stretching Non-linear rheology Planar elongation 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Mette Krog Jensen
    • 1
  • Ole Hassager
    • 1
  • Henrik Koblitz Rasmussen
    • 2
  • Anne Ladegaard Skov
    • 1
  • Anders Bach
    • 3
  • Henning Koldbech
    • 4
  1. 1.Department of Chemical and Biochemical Engineering, Building 423The Technical University of DenmarkLyngbyDenmark
  2. 2.Department of Mechanical Engineering, Building 423The Technical University of DenmarkLyngbyDenmark
  3. 3.Coloplast A/SGlobal R&D, Holtedam 1HumlebækDenmark
  4. 4.Department of Chemical and Biochemical Engineering, Building 229The Technical University of DenmarkLyngbyDenmark

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