Acta Phys. -Chim. Sin. ›› 1997, Vol. 13 ›› Issue (03): 242-246.doi: 10.3866/PKU.WHXB19970311

• ARTICLE • Previous Articles     Next Articles

The Temperature and Electric Field Dependence of Properties for Hydrous Electrorheological Fluid-Lithium Polymethacrylate

Guan Jian-Guo,Zhao Su-Ling,Xie Hong-Quan   

  1. Institute of Advanced Materials,Wuhan University of Technology,Wuhan 430070|Department of Chemistry,Huazhong University of Science and Technology,Wuhan 430074
  • Received:1996-08-29 Revised:1996-11-27 Published:1997-03-15
  • Contact: Guan Jian-Guo

Abstract:

 The static yield stress(τs) and current density (J) for electrorheological (ER) fluids, containing lithium polymethacrylate particles with different water content (Q) in silicone oil were determined as functions of temperature (T) and directed electric field strengths (E). The Arrhenius equation and the power functions were used to fit the data over a temperature range from 8 to 80℃. The results showed that τs ∝ E2 at low E while τs ∝ E at relative high E. J ∝ Eb, in which b was related with Q. With increasing T, J increased rapidly with a thermal activation energy of about 0.7eV. In contrast, τs increased with a thermal activation energy of about 0.15eV at lower Q. The results were discussed in terms of the ionic polarization mechanism. It was suggested that the ER effect for the system was mainly originated from the migration of mobile ions such as Li+ within particles.

Key words: Electrorheological fluid, Lithium polymethacrylate, Ionic polarization mechanism, Yield stress, Activation energy