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Electrorheological properties of perchloric acid-doped polythiophene suspensions

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Abstract

Poly(3-thiopheneacetic acid), PTAA, was synthesized via an oxidative polymerization and doped with perchloric acid to control its conductivity. The rheological properties of the HClO4-doped PTAA/silicone oil suspensions were measured in oscillatory shear to investigate the effects of electric field strength, particle concentration, and particle conductivity on electrorheological (ER) characteristics. The PTAA-based ER fluids exhibit viscoelastic behavior under an applied electric field and the ER response is amplified with increase of electric field strength. The dynamic moduli, G′ and G″, increase dramatically by ten orders of magnitude when the field strength is increased to 2 kV/mm. The suspensions exhibit a transition from fluid-like to solid-like behavior as the field strength increases, and reach a saturated ER response at a field strength of 1 kV/mm. Increase of particle concentration and particle conductivity result in a lower transition field strength. Scaling arguments are presented which successfully superpose the scaled moduli at various electric field strengths onto a single master function of the dimensionless frequency.

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Acknowledgements

The authors would like to acknowledge the financial support provided by The Thailand Research Fund (TRF) in the RGJ grant no. PHD/0128/2542 and TRF-BGJ grant no. BGJ/03/2544.

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Authors and Affiliations

  1. The Petroleum and Petrochemical College, Chulalongkorn University, 10330, Bangkok, Thailand

    Datchanee Chotpattananont & Anuvat Sirivat

  2. Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH, 44106-7202, USA

    Alexander M. Jamieson

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  1. Datchanee Chotpattananont
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  2. Anuvat Sirivat
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  3. Alexander M. Jamieson
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Correspondence to Anuvat Sirivat.

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Chotpattananont, D., Sirivat, A. & Jamieson, A.M. Electrorheological properties of perchloric acid-doped polythiophene suspensions. Colloid Polym Sci 282, 357–365 (2004). https://doi.org/10.1007/s00396-003-0945-7

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  • DOI: https://doi.org/10.1007/s00396-003-0945-7

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