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Title: TTS in LAOS: Validation of Time Temperature Superposition under Large Amplitude Oscillatory Shear
Authors: Vananroye, Anja
Leen, Pieter
Van Puyvelde, Peter
Clasen, Christian # ×
Issue Date: Oct-2011
Publisher: D. Steinkopff Verlag
Series Title: Rheologica Acta vol:50 issue:9-10 pages:795-807
Abstract: The validation of time-temperature superposition (TTS) of non-linear parameters obtained from large amplitude oscillatory shear (LAOS) is investigated for a model viscoelastic fluid. Oscillatory time sweeps were performed on a 11 wt% solution of high molecular weight polyisobutylene in pristane as a function of temperature and frequency and for a broad range of strain amplitudes varying from the linear to the highly non-linear regime. Lissajous curves show that this reference material displays strong non-linear behavior when the strain amplitude is exceeding a critical value. Elastic and viscous Chebyshev coefficients and alternative non-linear parameters were obtained based on the framework of Ewoldt et al. (2008) as a function of temperature, frequency, and strain amplitude. For each strain amplitude, temperature shift factors aT(T) were calculated for the first order elastic and viscous Chebyshev coefficients simultaneously, so that master curves at a certain reference temperature Tref were obtained. It is shown that the expected independency of these shift factors on strain amplitude holds even in the non-linear regime. The shift factors aT(T) can be used to also superpose the higher order elastic and viscous Chebyshev coefficients and the alternative moduli and viscosities onto master curves. It was shown that the Rutgers-Delaware rule also holds for a viscoelastic solution at large strain amplitudes.
ISSN: 0035-4511
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter, Rheology and Technology Section
× corresponding author
# (joint) last author

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