Effects of Conductivity and Dielectric Behaviors on the Electrorheological Response of a Semiconductive Poly(p-phenylene) Suspension
Effects of Conductivity and Dielectric Behaviors on the Electrorheological Response of a Semiconductive Poly(p-phenylene) Suspension
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DOI：
10.1006/jcis.1998.5426
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发表时间：
1998-05
影响因子：
9.9
通讯作者：
B. Chin;Y. S. Lee;O. Park
中科院分区：
文献类型：
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作者：
B. Chin;Y. S. Lee;O. Park
摘要我们研究了基于半导体聚合物的无水悬浮液的电流变特性。为了研究聚合物粒子的电性能对电流变现象的影响，合成了聚对苯撑，并通过掺杂FeCl3溶液赋予其导电性。电流变悬浮液的介电行为表明，适当掺杂的悬浮液具有中等导电性的粒子的易化界面极化。这些行为与动态屈服应力的大小密切相关，动态屈服应力随颗粒电导率的增加先出现最大值后减小。因此，我们确定了FeCl3掺杂聚对苯撑的最佳条件，使其表现出最大的电流变活性.动态粘弹性的ER悬浮液的特点也是有限的情况下。这些实验结果给出了一个明确的导电性之间的关系，颗粒的电流变行为。此外，界面极化对屈服应力行为的影响进行了研究，使用表面活性剂激活的电流变悬浮液。在很宽的温度范围内，我们的悬浮液显示出良好的ER活性，同时保持低电流密度，这将扩大ER流体的潜在适用性。
Abstract We considered the electrorheological (ER) properties of an anhydrous suspension based on a semiconducting polymer. In order to investigate the effects of the electrical properties of polymeric particles on the ER phenomena, poly( p -phenylene) was synthesized and endowed with semiconductivity by doping with FeCl 3 solutions. The dielectric behaviors of ER suspension revealed facilitated interfacial polarization for the appropriately doped suspension with intermediate conductivity of particle. These behaviors were found to be closely related with the magnitude of dynamic yield stress, which showed a maximum and then decreased with increasing conductivity of particles. Therefore, we established an optimum condition of FeCl 3 doping of poly( p -phenylene) showing the maximum ER activity. Dynamic viscoelastic properties of the ER suspension were also characterized for the limited case. These experimental results give a clear relationship between the conductivity of semiconductive particles and their ER behaviors. Furthermore, effects of the interfacial polarization on yield stress behaviors were investigated using surfactant-activated ER suspensions. Over a wide range of temperature, our suspensions show good ER activity while retaining the low current density that would broaden the potential applicability of the ER fluids.