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Rheologica Acta

, Volume 51, Issue 8, pp 755–769 | Cite as

Microsecond relaxation processes in shear and extensional flows of weakly elastic polymer solutions

  • Damien C. Vadillo
  • Wouter Mathues
  • Christian Clasen
Original Contribution

Abstract

In this paper, we introduce an experimental protocol to reliably determine extensional relaxation times from capillary thinning experiments of weakly elastic dilute polymer solutions. Relaxation times for polystyrene in diethyl phthalate solutions as low as 80 μ s are reported: the lowest relaxation times in uniaxial extensional flows that have been assessed so far. These data are compared to the linear viscoelastic relaxation times that are obtained from fitting the Zimm spectrum to high frequency oscillatory squeeze flow data measured with a piezo-axial vibrator (PAV). This comparison demonstrates that the extensional relaxation time reduced by the Zimm time, λ ext/λ z, is not solely a function of the reduced concentration c/c*, as is commonly stated in the literature: an additional dependence on the molecular weight is observed.

Keywords

Polymer solution Linear viscoelasticity Nonlinear viscoelasticity Extensional flow Necking, Relaxation time 

Notes

Acknowledgements

CC and WM acknowledge financial support from the ERC starting grant no. 203043-NANOFIB. DV acknowledges financial support from the Engineering and Physical Sciences Research Council (UK) and industrial partners in the Innovation in Industrial Inkjet Technology project, EP/H018913/1 as well as Dr T. Tuladhar and Dr S. Hoath and Dr Phil Threlfall-Holmes for discussions. The authors acknowledge Prof. M. Mackley for fruitful discussions and Dr S. Butler for his help in low-viscosity measurements.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Damien C. Vadillo
    • 1
    • 3
  • Wouter Mathues
    • 2
  • Christian Clasen
    • 2
  1. 1.Department of Chemical Engineering and BiotechnologyUniversity of CambridgeCambridgeUK
  2. 2.Department of Chemical EngineeringUniversity of Leuven (KU Leuven)HeverleeBelgium
  3. 3.AkzoNobel Research, Development and InnovationGatesheadUK

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