Electrorheological properties of poly(lithium-2-acrylamido2-methyl propane sulfonic acid) suspensions

Unal H. İ., Yilmaz H.

JOURNAL OF APPLIED POLYMER SCIENCE, vol.86, no.5, pp.1106-1112, 2002 (SCI-Expanded) identifier 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
  • Gazi University Affiliated: Yes

Abstract

In this study, poly(2-acrylamido-2-methyl-1-propane sulfonic acid) (PAMPS) was synthesized using potassium persulfate (K2S2O8) as initiator. PAMPS ((M) over bar (n) = 36,000 g/mol) was partially converted to a lithium salt (PAMPS-Li), and particle size was determined to be 40 gm. 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 80degreesC. 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 () and electric field strengths (E). Further, effects of polar promoters and high temperature on ER activity were determined, and excess shear stresses (AT) were calculated. A shear-thinning nonNewtonian viscoelastic behavior was observed for the PAMPS-Li suspensions. (C) 2002 Wiley Periodicals, Inc.