Electrorheological properties of PMMA-b-PSt copolymer suspensions


Yilmaz H., Degirmenci M., Ünal H. İ.

Journal of Colloid and Interface Science, vol.293, no.2, pp.489-495, 2006 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 293 Issue: 2
  • Publication Date: 2006
  • Doi Number: 10.1016/j.jcis.2005.06.078
  • Journal Name: Journal of Colloid and Interface Science
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.489-495
  • Keywords: Colloidal suspensions, Electrorheological fluids, Ionomer, PMMA-PSt block copolymer, RATRP
  • Ankara Haci Bayram Veli University Affiliated: Yes

Abstract

In this study, a block copolymer of methyl methacrylate (MMA) and styrene (St) synthesized by combined ultrasonic irradiation and reverse atom transfer radical polymerization (RATRP) processes was used. PMMA-b-PSt was partially hydrolyzed and converted to a lithium salt, PMMA-b-PSt-Li, before the electrorheological (ER) measurements carried out. Average particle diameter of PMMA-b-PSt-Li polymeric salt was determined by dynamic light scattering (DLS) as 22 μm. Suspensions of PMMA-b-PSt-Li polymeric salts were prepared in silicone oil. ER properties of PMMA-b-PSt-Li/silicone oil suspensions were studied as a function of electric field strength, dispersed phase concentration, shear rate, shear stress, temperature, frequency, and polar promoter. Further dielectric properties of PMMA-b-PSt-Li ionomer were also investigated. © 2005 Elsevier Inc. All rights reserved.