Rheologica Acta

, Volume 39, Issue 3, pp 241–246

The crossover between linear and non-linear mechanical behaviour in polymer solutions as detected by Fourier-transform rheology

  • Manfred Wilhelm
  • Pierre Reinheimer
  • Martin Ortseifer
  • Thorsfen Neidhöfer
  • Hans-Wolfgang Spiess
ORIGINAL CONTRIBUTION

DOI: 10.1007/s003970000084

Cite this article as:
Wilhelm, M., Reinheimer, P., Ortseifer, M. et al. Rheol. Acta (2000) 39: 241. doi:10.1007/s003970000084

Abstract

 The application of oscillatory shear strain leads, in the non-linear regime, to the appearance of higher harmonic contributions in the shear stress response. These contributions can be analyzed as spectra in Fourier space, with respect to different frequencies, amplitudes and phase angles. In this article, we present an application of this new characterization method to a solution of the linear homopolymer polyisobutylene. The degree of non-linear response during oscillatory shear is quantified using the normalized intensity of the third harmonic contribution. We were able to show experimentally on polyisobutylene that there is an immediate onset of the non-linear response even for very small shear strain amplitudes.

Key words Fourier-transform rheology Viscoelastic polymer solutions Non-linear regime High sensitivity FT-rheology 

Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • Manfred Wilhelm
    • 1
  • Pierre Reinheimer
    • 1
  • Martin Ortseifer
    • 1
  • Thorsfen Neidhöfer
    • 1
  • Hans-Wolfgang Spiess
    • 1
  1. 1.Max-Planck-Institut für Polymerforschung Postfach 3148, 55021 Mainz, Germany e-mail: wilhelm@mpip-maint.mpg.dcDE

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