Influence of amine- and sulfonate-functional groups on electrorheological behavior of polyacrylonitrile dispersed suspension

Abstract

Aminated polyacrylonitrile (PAN-TAEA) and sulfonated PAN (PAN-TAEA-SAA) dispersed suspensions have been prepared with a size- and shape-controlled PAN homopolymer sphere as a raw material, to observe the influence of amine- and sulfonate-functional groups on electrorheological behaviors. The electrorheological properties of prepared suspensions are measured by using a rheometer under various electric fields. The pristine PAN and PAN derivatives dispersed suspensions showed noteworthy shear stress values in the order of PAN-TAEA-SAA, PAN-TAEA, and pristine PAN under an electric field. And the PAN derivatives dispersed suspensions showed trembled shear stress curves which are distinguished into three regions, while the pristine PAN showed linear behavior in shear stress-shear rate curve at 3 kV/mm. As a result, an effective strategy to estimate the effects of functional groups on electrorheological properties has been offered by the modification of a PAN homopolymer sphere whose nitrile group can be easily substituted with a target group. (C) 2016 Elsevier B.V. All rights reserved.