Abstract
The non-linear viscoelasticity of concentrated solutions and glasses of soft starlike micelles has been studied by large-amplitude oscillatory shear (LAOS). The non-linear response has been analysed using current schemes of Fourier transform (FT) rheology, and its character has been determined by the phase of the third harmonic contribution to the stress. The limitations of FT rheology and related analysis methods are discussed, and an alternative method is presented that takes into account all the higher harmonics. This method reveals a strain-hardening character of intracycle non-linearities at large strain amplitudes for all volume fractions. We also show that, although the relation of LAOS with steady shear measurements works qualitatively, due to inherent limitations of LAOS, steady shear data cannot be reproduced quantitatively.
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Notes
All data have been shifted so that at t = 0 the strain is zero and the shear rate is positive.
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Acknowledgments
We thank Nikos Koumakis for the valuable discussions. We acknowledge Lutz Willner for the synthesis of the PEP-PEO block copolymer. This work has been supported by the EU funding through NoE ‘Softcomp’ and NMP SMALL ‘Nanodirect’. J.S. acknowledges DFG for the support via SFB-TR6 and EU project ‘ESMI Infrastructure FP7 - 262348’.
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Poulos, A.S., Stellbrink, J. & Petekidis, G. Flow of concentrated solutions of starlike micelles under large-amplitude oscillatory shear. Rheol Acta 52, 785–800 (2013). https://doi.org/10.1007/s00397-013-0703-9
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DOI: https://doi.org/10.1007/s00397-013-0703-9