Barium Titanate / Polymer Core-shell Composite Particles Prepared Its Electric Field Response Performance

Compared with the single component materials, the composite material contains two or more polymer materials. Not only it is can overcome the weakness and the negative influence of single component materials, but also it can again many new perfonnances at the same time. A new kind of inorganic/polymer core-shell materials is developed rapidly in recent years. Core-shell material is by a kind of nanometer material as the core, and another kind of material as the shell. The material wrapped in core surface through the chemical bonds or other forces, formed orderly assembly structure. This new type of materials is not only integrated inorganic material and polymer material all excellent characteristics, but also it can give new material some specific functions. In core-shell material, polymer shell layer exists in the inorganic core surface, which made the surface of core properties changed and effectively improved the compatibility of inorganic core in different substrate material. So this new material has widely application in optical and electrical, biology and machinery and other fields. At present, one of the most simple and effective method of preparation core-shell material is the emulsion polymerization. This preparation method has many features, such as simple, foresight, repeat rate high, the product configuration is uniform and stable performance.The present paper is preparation of single dispersive nanoscale BaTiO3 particles using hydrothermal, in based on the nanoscale TiO2. Using the silane coupling reagent KH560 modified for the surface of BaTiO3 particle. Again with modification of BaTiO3 particles is as core, use emulsion polymerization method for preparation of core-shell structure of BaTiO3/PI, BaTiO3/Chitosan, BaTiO3/PS, BaTiO3/PMMA, BaTiO3/PAA, BaTiO3/PAM six composite particles. Through the transmission electron microscope and optical contact angle meter analyzed the core-shell materials of surface structure and surface performance. And by XRD and FT-IR methods analyzed the composite particle internal structure, composition and crystal of composite particle. BaTiO3 has maintained cubic-perovskite structure in all process. The surface hydrophile of BaTiO3/PI is strongest in all composite particles.Furthermore, based on the above, using dielectric analyzer and dynamic viscoelastic spectrum analyzer studied for these composite particle dielectric and the response to electric field of composite particle in gelatin hydrogel elastomer. The results show that the response to electric field of the core-shell structure of BaTiO3/PI, BaTiO3/Chitosan, BaTiO3/PS,BaTiO3/PMMA, BaTiO3/PAA, BaTiO3/PAM composite particles have different degree of increase than pure BaTiO3 particle. This explains BaTiO3 particle after polymer coated, the hardness of BaTiO3 particles, density bigger and resistance to settlement poor stability of these weaknesses were given greatly improved, so as to enhance the aqueous composite elastomer BaTiO3 particle in the response to electric field and improve the dispersibility of particles. The dielectric constant of BaTiO3 is strongest in all particles.