物理化学学报 >> 1997, Vol. 13 >> Issue (03): 242-246.doi: 10.3866/PKU.WHXB19970311

研究论文 上一篇    下一篇

电场和温度对含水电流变液性能的影响

官建国,赵素玲,谢洪泉   

  1. 武汉工业大学新材料研究所，武汉 430070|华中理工大学化学系，武汉 430074
  • 收稿日期:1996-08-29 修回日期:1996-11-27 发布日期:1997-03-15
  • 通讯作者: 官建国

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

PDF

2578

赞

摘要：

 测试了聚甲基丙烯酸锂（Li－PMAA）粒子含水量（Q）不同时的Li－PMAA／硅油电流变（ER）液的静态屈服应力（τs）和电流密度（J）随电场强度（E）和温度（T）的变化，同时分别用幂函数和Arrhenius方程拟合了τs、J与E、T的关系，并计算了与τs、J有关的两种活化能（Ea、Eb）.发现ER液在低电场下，τs∝E2；而在高电场下，τs∝E, J∝Eb, b与Q有关，随Q增加而增加.当Q较小时，ER液的τs、J随温度的升高而增加，且Ea＝0.15eV，Eb＝0.70eV. 作者认为该体系的ER效应主要是由粒子中的可移动离子如Li＋在电场作用下产生粒子内迁移所致.

关键词: 电流变液, 聚甲基丙烯酸锂, 离子极化机理, 屈服应力, 活化能

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