Journal of Materials Science

, Volume 45, Issue 7, pp 1972–1976 | Cite as

Strain-hardening in the oscillatory shear deformation of a dedoped polyaniline electrorheological fluid

  • Piyanoot Hiamtup
  • Anuvat Sirivat
  • Alexander M. Jamieson


An electrorheological (ER) fluid, consisting of polydisperse dedoped polyaniline (PANI) particles, having irregular shapes, dispersed in silicone oil, was subjected to cyclic strain annealing treatments using oscillatory shear, under an external electric field. After each annealing period, the sample was subjected to a controlled-strain sweep, to determine the yield stress, and to erase the ER structure. During each annealing cycle, the storage modulus and the yield stress were observed to increase, and the loss modulus to decrease, each eventually approaching an asymptotic constant value. These observations in oscillatory shear complement our previous observations of a strain-hardening effect in a PANI/silicone oil ER fluid subjected to unidirectional creep tests.


PANI Oscillatory Shear Yield Strain Primary Chain Nonlinear Viscoelasticity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors (PH and AS) would like to acknowledge the financial support provided by the Thailand Research Fund (TRF, RGJ Grant No. PHD/0234/2544 and BRG grant), Conductive & Electroactive Polymers Research Unit and KFAS of Chulalongkorn University, the Royal Thai Government (Budget of Fiscal Year 2550), and the Petroleum Petrochemical and Advanced Materials Consortium. AMJ also wishes to acknowledge the financial support from the National Science Foundation, Polymers Program, under Grant No. DMR 0513010.


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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Piyanoot Hiamtup
    • 1
  • Anuvat Sirivat
    • 1
  • Alexander M. Jamieson
    • 2
  1. 1.The Petroleum and Petrochemical CollegeChulalongkorn UniversityBangkokThailand
  2. 2.Department of Macromolecular ScienceCase Western Reserve UniversityClevelandUSA

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