Electrorheological properties of PMMA-b-PSt copolymer suspensions
Journal of Colloid and Interface Science, vol.293, no.2, pp.489-495, 2006 (SCI-Expanded, Scopus)
- 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.