Monodisperse semiconducting poly(N-methylaniline) (PNMA) microspheres with a suitable electrical conductivity were fabricated using a chemical oxidation process and employed in an electrorheological (ER) suspension. Morphological image of the synthesized PNMA microsphere was assessed via scanning electron microscope and transmission electron microscope. Its chemical composition and thermal behavior were determined using Fourier-transform infrared and thermal gravimetric analysis, respectively. Chain-like structure formation under an input electric field in ER fluid containing silicone oil and 10 wt% PNMA microspheres was observed directly with optical microscopy. Viscoelastic characteristics of the ER fluid under an input electric field were evaluated with a rotational rheometer. Yield stress with a power exponent of 1.5 was observed, along with typical solid-like property under electric field. Dielectric behavior of the ER suspension measured was also found to be closely associated with its ER behavior.

具有合适导电性的单分散半导体聚（N-甲基苯胺）（PNMA）微球是使用化学氧化工艺制造的，并用于电流变（ER）悬浮液中。通过扫描电子显微镜和透射电子显微镜评估合成的 PNMA 微球的形态图像。其化学成分和热行为分别使用傅立叶变换红外和热重分析确定。用光学显微镜直接观察在含有硅油和 10 wt% PNMA 微球的 ER 流体中在输入电场下形成链状结构。使用旋转流变仪评估输入电场下 ER 流体的粘弹性特性。观察到幂指数为 1.5 的屈服应力，以及电场下典型的类固体性质。还发现测量的 ER 悬浮液的介电行为与其 ER 行为密切相关。