Department of Polymer Science and Engineering, Inha University, Incheon 402-751, Republic of Korea.
J Colloid Interface Sci. 2013 Mar 15;394:108-14. doi: 10.1016/j.jcis.2012.12.040. Epub 2012 Dec 28.
Polystyrene (PS)/laponite composite nanoparticles were fabricated using a surfactant-free Pickering emulsion polymerization method, in which emulsions of styrene dispersed in water were stabilized by hydrophilic laponite modified with cetyltrimethylammonium bromide. The PS/laponite nanoparticles, of which their surface was covered compactly by laponite clay platelets, were observed by scanning electron microscopy. Fourier-transform infrared spectroscopy, X-ray diffraction, and thermogravimetric analysis confirmed their chemical composition, crystallographic structure, and thermal properties and weight loss percentage of the laponite located on the surface of the PS particle, respectively. When an external electrical field was applied, the chain-like structure of the laponite coated nano-sized PS particle exhibiting electrorheological characteristics was observed by optical microscopy. The electrorheological performance of the bulk properties was also examined using a rotational rheometer equipped with a high voltage generator.
采用无表面活性剂的 Pickering 乳液聚合法制备了聚苯乙烯（PS）/锂皂石复合纳米粒子，其中苯乙烯乳液在水相中稳定分散，使用十六烷基三甲基溴化铵改性的亲水性锂皂石作为稳定剂。通过扫描电子显微镜观察到 PS/laponite 纳米粒子，其表面紧密覆盖着锂皂石粘土薄片。傅里叶变换红外光谱、X 射线衍射和热重分析分别证实了它们的化学组成、结晶结构以及热性能和位于 PS 颗粒表面的锂皂石的重量损失百分比。当施加外部电场时，通过光学显微镜观察到具有电流变特性的涂覆有锂皂石的纳米级 PS 链状结构颗粒。使用配备高压发生器的旋转流变仪还检查了整体性质的电流变性能。
