核壳型聚苯胺/钛酸钡的结构及其电流变性能

用改进的溶胶 凝胶法制备了核壳型聚苯胺 /钛酸钡复合微粉 ,通过TEM及FT IR分析表征了其形貌及微观结构 ,用复合微粉与氯化石蜡油配制成无水电流变 (ER)液 ,研究其不同膜厚核壳粒子的电流变性能 .研究结果表明 ,聚苯胺 /钛酸钡复合粒子配置成的电流变液的电流变性能较纯聚苯胺的为强 ;钛酸钡的涂层厚度对复合粒子电流变性能有重要影响 ;并在d =2 0nm时获得最佳电流变性能 .

The Structure and Electrorheological Effect of PAn/BaTiO3 Nanocomposite

Organic-inorganic nanocomposite, which is the complex of inorganic nanoparticles with the organic compound, is a popular research project in the nanoscale composite. The blending of different sorts of materials produces composite structures which can combine different material properties, or may reveal novel properties not existing in the constituent phases. In this issue, taking account of the problems in electrorheological fluids such as the high leakage current, low yield stress and stability, a novel type of electrorheological particles which were composed of the polyaniline core and BaTiO 3 shell were prepared. As the core was made of polyaniline, the diameter and its distribution of ER particle (ERP) could be readily controlled. Furthermore, the polymer core contributed to the reduction of the density of ER particles, which was expected to prevent the sedimentation of the particles. The outer nonconductive layer, on the other hand, should have strong electronic resistance and excellent dielectric strength. In this sense, barium titanate was one of the best materials for the nonconductive layer. We had deposited BaTiO 3 layers on the particles by means of the sol-gel technique. The structure of particles was characterized by TEM and FT-IR; the influence of the thickness of barium titanate of the ERP on the ER effects were studied in detail. The results showed that the ER effect of composite particles was far stronger than that of pure polyanilines which were synthesized by the same method, the thickness of BaTiO 3 thin film had an important influence on the ER effects and the optimum effect was obtained at d=20 nm.