采用前驱体法、溶胶-沉淀技术合成了一种新型的电流变材料--钛酸锶,对其进行表征,并将其分散于不同的介质中形成电流变液,考察了分散介质对钛酸锶微粒的电流变效应的影响.

制备了聚苯胺、聚甲基苯胺和溴化聚苯胺三种微粒,将其分别分散在氮化石腊中形成电流变体以考察苯环取代基的性质对聚苯胺电流变效应的影响.结果表明,聚甲基苯胺电流变效应最强、溴化聚苯胺最弱.掺杂程度对聚苯胺和聚甲基苯胺电流变效应影响的研究表明,分别存在一适宜的掺杂程度使其电流变效应较好.少量的聚丙烯酸锂与聚苯胺的复合在不明显减弱其电流变效应的同时可降低其电流密度.

Theγ-Fe2O3/lithium polyacrylate composite particles were synthesized by an inversed emulsion polymerization. The particles were dispersed in silicone oil with different viscosity, toluene, bromibenzene and dicapryl phthalate respectively to obtain the ER fluids. The influences of the base liquid viscosity on the ER effects were then studied. The results show that the base liquid viscosity should be taken into account when the dielectric constants of the liquids are the same or similar to each other. In the liquids with excessively low viscositys, such as toluene and bromibenzene, the particles cannot suspended stably during storage and utility, thus resulting in the decreasing of the ER effects. On the other hand, dispersed in the liquids with viscosity within a certain range, such as silicone oil with viscosity from 50cS to 500cS, the particles almost exhibit the same ER effects. The current density of the ER fluids increases with decreasing the base liquid viscosity.