金属核心/高聚物膜复合悬浮相电流变流体材料

Metal Core/Polymer Coating Compounded Suspension for Electrorheologic Fluid

针对电流变流体悬浮相材料的开发与研究，根据介质极化原理，设计开发了金属核心 /高聚物膜复合悬浮相电流变流体材料，在乳液聚合与微胶囊包覆技术的基础上，制备出了金属核心 /高聚物膜复合颗粒 .并对这种金属核心 /高聚物膜复合颗粒的电流变流体性能进行了测试与研究 .从理论和实验上都说明了金属核心 /高聚物膜复合悬浮相材料在改善电流变流体力学性能及稳定性方面具有潜力，是可以进一步提高与改进的电流变流体材料 .

Aiming at researching and developing new compounded suspensions to sever as electrorheological fluid (ERF), a metal core/polymer coating compounded suspension for ERF has been designed according to the principle of media polarization. Based on this evolution, a series of metal core/high polymer coating compounded particles such as Zn/poly-styrene-butyl-acrylate compounded particles, Ni/poly-styrene-butyl-acrylate compounded particles, Ni/polystyrene compounded particles, Zn/polystyrene compounded particles have been prepared adopting the emulsion polymerization together with the micro-encapsulation techniques as well as the acid-alkali matching theory which was initially suggested by Fowkes (schematically depicted in Fig, 1). The micro-morphologies of these compounded particles were measured using scan electron microscophy (the SEM photography of Fig. 2 exhibits the coated condition of these particles) and the ERF performance of these compounded particles have alse been carried out. The performance test results indicate that the mechanical properties (refer to Fig. 5 similar to 10) and the stability of ERF were improved, i.e. shear strength was no less than 2 kPa and segregation resistance was intensified significantly compared with that of metal core, which shows that these materials are promising for acting as ERF though further modification should be necessary. Besides, from the performance test results it is apparently found that different compounded suspensions made up of different metal cores or polymer coatings possess various mechanical properties, and explanations for this phenomenon will discussed in detail elsewhere.