To understand structure-property relationship and guide molecular design of poly (ionic liquid)-based electrorheological materials with high performance at low temperature, we investigated geometry influence of mobile counterions in poly (ionic liquid)s on glass transition temperature, conductivity, polarization, and electrorheology at 0 °C by synthesizing poly [4-styrenesulfonyl (trifluoromethylsulfonyl) imide]-based anionic poly (ionic liquid)s containing mobile countercations with similar molecular weight but different geometries. It found that as countercations changes from tetrahedral to planar geometry, the glass temperature decreases but the conductivity and polarization rate increase and, consequently, the electrorheological effect at 0 °C increases. Raman spectra, density functional theory calculation and activation energy analysis indicated that as countercations change from tetrahedral to planar geometry, the dissociation and transport of countercations are promoted due to increased plasticization effect, and this is responsible for poly (ionic liquid)s with planar countercations have larger ionic conductivity and interfacial polarization for stronger electrorheological effect at low temperature.

为了了解在低温下具有高性能的基于聚（离子液体）的电流变材料的结构-性质关系并指导分子设计，我们研究了聚（离子液体）中可移动抗衡离子对玻璃化转变温度，电导率，极化，通过合成基于聚[4-苯乙烯磺酰基（三氟甲基磺酰基）酰亚胺]的基于聚[4-苯乙烯磺酰基（三氟甲基磺酰基）酰亚胺]的阴离子聚（离子液体）在0°C下进行流变。发现当反阳离子从四面体变为平面几何形状时，玻璃温度降低，但电导率和极化速率增加，因此，在0°C时的电流变效应增加。拉曼光谱