Electrorheological properties of aminated chitosans

Abstract

This paper focused on effects of amine and pi-orbital for enhancing electrorheological properties. Various aminated chitosans were synthesized by coupling of diethylenetriamine, melamine, and Bismarck brown R onto chitosan in this study. After comparing the shear stress of all prepared ER fluids, melamine and Bismarck brown R coupled chitosans showed higher shear stress than other ER chitosan derivatives. Because amine group is cation, cation-pi interaction could be expected for enhancing shear stress together with pi-pi stacking. And these aminated chitosans showed low current density and conductivity due to the cation-a interaction not to the pi-pi stacking. (c) 2007 Elsevier B.V. All rights reserved.