Nanoparticles Modified Polysiloxane Continuous Phase Of Electrorheological Materials

Smart liquid material of nanometer particles grafting functional poly-silicone can be prepared and it behaves excellent stability. The process in this paper can be completed by the graft reaction of different functional poly-silicone and amino or vinyl nanometer particles, or via complex of amino,vinyl nanometer SiO2 with titanium and rare earth compound, and then react with different functional poly-silicones. Under a certain electric field intensity, because of instantaneous polarization or physical crosslink, this material could behave obvious change on the viscosity,shear stress,creep compliance,complex shear modulus and so on, and even behaves liquid-solid transformation. The study contains four main aspects as follows and have achieved some anticipant results.1. The Study on Preparation and Electrorheological Properties of Amino Nanometer Particles/Amino Polysilicone/Dimethylsilicone ERFFirstly, nanometer amino silica was obtained by the method of acidic condensation. The product was added into amino poly-silicone at a certain condition, and then was dispersed into methyl silicone in different mass ratio. The effect of formation condition of the particles was discussed. And related properties of particles were tested by FT-IR,TG and TEM. And using the Rheo Stress 600 HAAKE Vortical Rheometer, the effect of temperature,concentration,electric field intensity at the static shear were discussed. At the same time, the stability of material was compared.2. The Study on Properties of ERF of Vinyl Poly-silicone Grafting Composite Nanometer Particles and the Effect of Rare EarthAt the certain condition, vinyl on the surface of particles could be controlled in mass ratio, and its graft reaction with vinyl poly-silicone was carried through. At the same time, the stable ERF was obtained via the complex of titanium and rare earth. The content of vinyl organic component was tested by TG.. The function structure and the micro-state of the sample were analyzed by FT-IR,TEM and so on. Using the HAAKE Vortical Rheometer, the static shear stress behavior and dynamic forced oscillating experiment of this material were tested. And the effect of electric field intensity,category and content of rare earth were discussed, and the function of rare earth was speculated. This liquid material behaves nicer stability.3. The Study on Preparation and Electrorheological Properties of ERF via reaction of Hydroxy Poly-silicone Grafting Composite Nanometer Particles with Rare EarthIn the function reaction of nanometer particles, vinyl silane coupling reagent was chosen. At a certain condition, its reaction with hydroxy poly-silicone was completed and the ERF with proper mass ratio. Using the HAAKE Vortical Rheometer, the dynamic visco-elastic properties of this ERF was studied. After the study on the creep characteristic and the forced oscillating experiment, it was found that the ERF could produce liquid-solid transition at certain electric field. And the effects of electric field intensity,infliction stress,scan frequency were discussed. And it was found that in the method of compare and FT-IR results, the ERF behaved excellent stability. The micro-state was observed by freeze etching electron microscope.4. Establishment of Characteristic Model and the Effect of Variable Damping of ERF on System VibrationIn this part, displacement magnitude-frequency characteristic curve was studied, and the characteristic model equation was established. This is propitious to design variable damping vibration system from the point of application. As an important vibration form, damping vibration has been applied widely in engineering technology. However, in different vibration systems, vibration rule is decided by intrinsic factor of system, and the vibration process can not be adjusted. Therefore, this is a limitation in the application. As the development of ERF, the property that its viscosity can increase as the increase of electric field intensity could be used in different auto control systems. The properties can be controlled by the electric field intensity, and the variable damping vibration system could be designed.