Zheng Chen, Lei Qi, Zhao Jia, Zhao Xiaopeng, Yin Jianbo
Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710129, China.
Polymers (Basel). 2020 Mar 22;12(3):703. doi: 10.3390/polym12030703.
By using different conductivity of polyaniline as filler, a kind of poly(ionic liquid)/polyaniline composite particles was synthesized to investigate the influence of dielectric polarization rate difference between filler and matrix on the electrorheological response and flow stability of composite-based electrorheological fluids under simultaneous effect of shear and electric fields. The composite particles were prepared by a post ion-exchange procedure and then treated by ammonia or hydrazine to obtain different conductivity of polyaniline. Their electrorheological response was measured by dispersing these composite particles in insulating carrier liquid under electric fields. It showed that the composite particles treated by ammonia had the strongest electrorheological response and most stable flow behavior in a broad shear rate region from 0.5 s to 1000 s. By using dielectric spectroscopy, it found that the enhanced electrorheological response with stable flow depended on the matching degree of the dielectric polarization rates between poly(ionic liquid) matrix and polyaniline filler. The closer their polarization rates are, the more stable the flow curves are. These results are helpful to design optimal composite-based electrorheological materials with enhanced and stable ER performance.
通过使用不同电导率的聚苯胺作为填料，合成了一种聚（离子液体）/聚苯胺复合颗粒，以研究在剪切场和电场同时作用下，填料与基体之间的介电极化速率差异对基于复合颗粒的电流变液的电流变响应和流动稳定性的影响。通过后离子交换程序制备复合颗粒，然后用氨或肼处理以获得不同电导率的聚苯胺。通过将这些复合颗粒分散在绝缘载液中并置于电场下测量其电流变响应。结果表明，经氨处理的复合颗粒在0.5 s至1000 s的宽剪切速率范围内具有最强的电流变响应和最稳定的流动行为。通过介电谱发现，具有稳定流动的增强电流变响应取决于聚（离子液体）基体与聚苯胺填料之间介电极化速率的匹配程度。它们的极化速率越接近，流动曲线越稳定。这些结果有助于设计具有增强和稳定电流变性能的最佳基于复合颗粒的电流变材料。
