Interfacial Polarization and Electrorheology of Suspensions Containing Monodispersed Ellipsoidal Poly(ionic liquid) Particles

作者：Yudong Wang, Xiaoyang Zhao, Jingyi Li, Haoming Pang, Xiaopeng Zhao, Jianbo Yin · 发表于：Macromolecules · 年份：2025 · DOI：10.1021/acs.macromol.5c00175 · 被引用次数：8 · 研究领域：Vibration Control and Rheological Fluids、Polymer Nanocomposites and Properties、Polymer composites and self-healing

The shape parameters of dispersed phase particles, such as the aspect ratio, have a significant influence on the performance of composite and suspension materials. However, due to the difficulty in preparing uniform dielectric particles having the same individual particle volume and chemical structure but different aspect ratios, the influence of the aspect ratio on the electrorheological (ER) effect of particle suspensions remains controversial. In this article, we prepared uniform ellipsoidal poly(ionic liquid) (PIL) particles with different aspect ratios via a thermal stretching method and investigated the influence of aspect ratio on the ER effect of suspensions containing ellipsoidal PIL particles. Because the ellipsoidal PIL particles are obtained by uniaxially stretching the identical uniform PIL microspheres, they are prolate ellipsoids of revolution (spheroids) having the same individual particle volume, density, and chemical structure and uniform size distribution and shape. In particular, the PIL particles are not hydrophilic because they have polyatomic fluorine-containing counterions. Thus, we remove the influences of volume, density, chemical structure, size and shape distribution of particles, and external water on the ER effect, leaving the aspect ratio as the sole factor to affect the ER effect. Under electric fields, we found that, unlike the early conclusion, the ER effect of PIL particle suspensions first decreases and then increases with the increase in a...