高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (9): 1457.

• 论文 • 上一篇    下一篇

聚合条件对聚甲基丙烯酸盐体系ER效应的影响

官建国, 谢洪泉, 过俊石   

  1. 华中理工大学化学系, 武汉, 430074
  • 收稿日期:1994-11-30 修回日期:1995-03-15 出版日期:1995-09-24 发布日期:1995-09-24
  • 通讯作者: 官建国,男,26岁,博士研究生.
  • 作者简介:官建国,男,26岁,博士研究生.

Influence of Polymerization Condition on Electrorheological Effect of Suspension Containing Salt of Poly(Methacrylic Acid)

GUAN Jian-Guo, XIE Hong-Quan, GUO Jun-Shi   

  1. Department of Chemistry, Huazhong University of Science and Technology, Wuhan, 430074
  • Received:1994-11-30 Revised:1995-03-15 Online:1995-09-24 Published:1995-09-24

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被引次数

20

摘要： 用反相乳液聚合直接合成了具有高电流变(ER)活性的聚甲基丙烯酸盐(SPMAA)的悬浮液。研究了影响ER效应的因素。结果表明:ER液的屈服应力(τs)随聚合时稳定剂和交联剂的用量及位于含水量的增加出现一最大值;同时,τs随ER液中粒径和粒子聚合物链上含盐重复单元的摩尔比的增加而增加。不同反离子SPMAA的ER液τs值按Li+＞Na+＞K+＞NH4+的顺序降低。并用离子极化机理对实验结果进行了解释,阐明了该体系中的水分在ER效应中的作用。

关键词: 电流变液, 聚甲基丙烯酸盐, 反相乳液聚合, 悬浮液, 离子极化机理

Abstract: Colloidal suspensions containing salts of poly(methacrylic acid ) which exhibit a high electrorheological(ER) activity were synthesized by inverse emulsion polymerization. The factors influencing the ER effect were studied. The results showed that the maximum yield stress occurred in the case where. optimum amounts of both polymeric stabilizer and crosslinking agent were used in the inverse emulsion polymerization as well as a certain water content of the particles, while yield stress increased with the increase of the average diameter of the particles below 0. 9 μm or the molar ratio of the salt to the acid. The ERactivity for the suspensions containing different monovalent counter ions decreased in the following order:Li+>Na+>K+> NH.The phenomena were discussed with the ionic polarization mechanism and the roles of the adsorbed water of the particles in the ERsuspensions were elucidated.

Key words: Electrorheological (ER) fluid, Salts of poly(methacrylic acid), Inverse emulsion polymerization, Suspension, Ionic polarization mechanism

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