Electrorheological properties of poly(lithium-2-acrylamido-2-methyl propane sulfonic acid) suspensions

Ünal H. İ., Yilmaz H.

Journal of Applied Polymer Science, vol.86, no.5, pp.1106-1112, 2002 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 86 Issue: 5
  • Publication Date: 2002
  • Doi Number: 10.1002/app.11044
  • Journal Name: Journal of Applied Polymer Science
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1106-1112
  • Keywords: Dispersions, Electrorheological fluid, Ionomers, Poly(2-acrylamido-2-methyl-1-propane sulfonic acid), Rheology
  • Ankara Haci Bayram Veli University Affiliated: No

Abstract

In this study, poly(2-acrylamido-2-methyl-1-propane sulfonic acid) (PAMPS) was synthesized using potassium persulfate (K2S2O8) as initiator. PAMPS (M̄n = 36,000 g/mol) was partially converted to a lithium salt (PAMPS-Li), and particle size was determined to be 40 μm. Suspensions of PAMPS-Li at various concentrations were prepared in silicone oil, mineral oil, dioctylphthalate (DOP), and trioctyltrimellitate (TOTM) insulating oils. Colloidal stabilities of these suspensions were determined at 20 and 80°C. The PAMPS-Li suspensions were observed to provide an electrorheological (ER) response upon the application of an external dc electric field. ER properties of these suspensions were investigated at various shear rates (γ) and electric field strengths (E). Further, effects of polar promoters and high temperature on ER activity were determined, and excess shear stresses (Δr) were calculated. A shear-thinning non-Newtonian viscoelastic behavior was observed for the PAMPS-Li suspensions. © 2002 Wiley Periodicals, Inc. J. Appl. Polym. Sci.