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Shear-thickening behaviour of concentrated polymer dispersions under steady and oscillatory shear

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Abstract

The rheological behaviour of a 58 vol.% dispersion of styrene/acrylate particles in ethylene glycol was investigated using a plate-on-plate rheometer. Experimental results showed that the concentrated polymer dispersion exhibited a strong shear-thickening transition under both steady shear and dynamic oscillatory conditions. The low-frequency dynamic oscillatory behaviour could be reasonably interpreted in terms of the steady shear behaviour. Accordingly, the critical dynamic shear rate \( \dot{\gamma }_{{{\text{c\_d}}}} , \) agreed well with the critical shear rate obtained in steady flow \( \dot{\gamma }_{{{\text{c\_s}}}} , \) where \( \dot{\gamma }_{{{\text{c\_d}}}} \) was calculated as the maximum shear rate by the critical dynamic shear strain γ c and the frequency ω, i.e. \( \dot{\gamma }_{{{\text{c\_d}}}} = \omega \gamma_{\text{c}} . \) However, during high-frequency dynamic oscillation, it was observed that the shear thickening occurred only when an apparent critical shear strain was reached, which could not be fully explained by the wall-slipping effect. Based on freeze fracture microscopic observations, the effect of the micro-sized flocculation of particles on the rheology of concentrated dispersions was also discussed.

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Acknowledgements

The authors are grateful to the Institute for Composite Material (IVW GmbH, Germany) where most of the results were generated. Dr.-Ing L. Chang wishes to thank the Alexander von Humboldt-Foundation for his research fellowship at IVW.

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Authors and Affiliations

  1. School of Aerospace, Mechanical & Mechatronic Engineering, The University of Sydney, Sydney, NSW, 2006, Australia

    Li Chang, Roger Tanner & Lin Ye

  2. Institute for Composite Materials, University of Kaiserslautern, 67663, Kaiserslautern, Germany

    Klaus Friedrich

  3. Department of Mechanical and Process Engineering, University of Kaiserslautern, 67663, Kaiserslautern, Germany

    Alois K. Schlarb

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  1. Li Chang
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  2. Klaus Friedrich
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  3. Alois K. Schlarb
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  4. Roger Tanner
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  5. Lin Ye
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Correspondence to Li Chang.

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Chang, L., Friedrich, K., Schlarb, A.K. et al. Shear-thickening behaviour of concentrated polymer dispersions under steady and oscillatory shear. J Mater Sci 46, 339–346 (2011). https://doi.org/10.1007/s10853-010-4817-5

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  • DOI: https://doi.org/10.1007/s10853-010-4817-5

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