对甲苯磺酸掺杂聚邻甲苯胺的合成及电流变性能

Synthesis and Electrorheological Properties of p-Toluenesulfonic Acid Doped Poly(o-Toluidine)

以对甲苯磺酸(TSA)作为掺杂剂和乳化剂,乳液聚合合成了对甲苯磺酸掺杂聚邻甲苯胺(TSA-POT)。采用红外光谱、热重分析和扫描电镜对聚合物的结构、热稳定性及形貌进行了表征。制备了TSA-POT/硅油(SO)无水型电流变流体(ER流体),测试了其电流变性能,考察了电场强度、反掺杂条件、粒子浓度等因素对TSA-POT/SO体系电流变性能的影响。结果表明,由于强极性的磺酸基团与聚邻甲苯胺的主链相连,极大地改善了聚合物粒子的极化性能,因此TSA-POT/SO体系的电流变性能显著改善。结果同时表明,低浓度的TSA-POT/SO体系的屈服应力与电场强度具有二次线性关系。

With p-toluenesulfonic acid （TSA） as dopant and emulsifier, p-toluenesulfonic acid doped poly（o- toluidine） （TSA-POT） was synthesized by emulsion polymerization. The structure, thermal stability and morphology of the polymer were characterized by Fourier transform infrared spectrum（FT-IR）, thermogravimetry （TG） and scanning electron microscope （SEM）. Anhydrous electrorheological （ER） fluid of TSA-POT suspended in silicofie oil （SO） was prepared and the ER performance was measured. The ER properties based on electric field, antidoped condition and particle concentration were investigated. The results show that, the ER performances of TSA-POT are highly improved by doped with TSA to POT, which is attributed to the strong polarity of sulfonic group in the TSA connected to the conjugated chain of POT. The results also suggest that the yield stress of TSA- POT/SO ER fluid at low concentration is in line with square of electric field strength.