由聚苯胺粒子组成的电流变液的研究

Study on Electrorheological Fluid Containing Polyaniline Particles

由经碱处理的掺杂态聚苯胺（ＰＡｎ）制得高介电常数的半导体ＰＡｎ粒子，将其悬浮于电绝缘油可组成电流变液，讨论了电流变（ＥＲ）液的静态屈服应力（τ＿ｓ），电流密度等性能与ＰＡｎ的介电常数（ε＿ｐ），导电率（σ），体积分数和应用电场强度的关系。对导电率相同的ＰＡｎ粒子，用氨水处理的ＰＡｎ粒子ε＿ｐ较用ＮａＯＨ液处理的高，前者在σ足够低如σ≤１．０×１０￣（－７）／ｃｍ时，ＥＲ液的τ＿ｓ随偶极系数的平方（β￣２）的增大而呈现非线性增加；后者ＥＲ液的τ＿ｓ随β￣２的增大出现一最大值．结果表明：由聚苯胺粒子可组成高电流变活性的无水ＥＲ液．

The static electrorheological properties of suspensions containing doped polyani-line(PAn) particles,pretreated with alkaline agent,in insulating oil No. 2 under direct cur-rent high electric field were studied as functions of dielectric constants, conductivity(σ),vol-ume fraction of the particles as well as applied electric field strength. The results showedthat the PAn particles of the same a pretreated by ammonia water possessed higher dielectricconstants than those pretreated by aqueous NaOH, In the former case yield stress of the sus-pension increased nonlinearly with dipolar coefficient square when a of PAn was low enough,i.e.σ≤1. 0×10-7S/cm, while in the latter case a maximum yield stress occurred. As a re-sult anhydrous suspensions with high electrorheological activity can be obtained using PAnparticles pretreated with alkaline agent to a certain pH value.