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Polymer modified barium titanate particle preparation and electric field response properties of

Author: LiLi
Tutor: GaoLingXiang
School: Shaanxi Normal University
Course: Inorganic Chemistry
Keywords: core-shell structure BaTiO3/Polymer composite particles electric field response performance
CLC: TM201.4
Type: Master's thesis
Year: 2013
Downloads: 39
Quote: 0
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Abstract


Electrorheological elastomer with structure stability, controllable and reversible properties named electrorheological characteristics, is widely regarded in many fields, such as smart materials, soft matter, rheology and super-materials. BaTiO3particles with high dielectric property are presumed to be one of the best ER elastomers dispersed phase materials, and provide the basis for the preparation of high performance of electrorheological materials, whereas the fact is not satisfied at present.In this study, we used polymer to modify the BaTiO3particles, achieved the enhancement of an electric field response performance of BaTiO3by prepared BaTiO3/Agar、BaTiO3/Gelatin、 BaTiO3/Gelatin-Chitosan、Gelatin-Chitosan/BaTiO3and Gelatin/BaTiO3five kinds of core/shell structure composite particles, in based on the nanoscale BaTiO3, Gelatin and Gelatin-Chitosan microspheres using microemulsion method and self-assembly deposition method. Particles’ structure, composition and surface hydrophile have been characterized by TEM、SEM、FT-IR、XRD、TG and optical contact angle measuring instrument. The results showed that the size of particles was less than1μm, and they bonded in each component by chemical bonds. The crystal form of BaTiO3was always maintaining cubic structure, and the particles surface still keep hydrophilic.Based on the above result, the dielectric properties and electric field response of particles were investigated by using dielectric analyzer and dynamic viscoelastic spectrum analyzer, respectively. The results showed that the composite particles both possess lower dielectric property. The use of polymer greatly improved the compatibility of BaTiO3with electrorheological elastomers gel network, which leaded a better dispersion of BaTiO3particles, and made the composite particles both possess stronger electric response than BaTiO3particles in gelatin/glycerol hydrous elastomers, especially for Gelatin-Chitosan/BaTi03composite particles. Five composite particles electric field response change according to the order of Gelatin-Chitosan/BaTiO3>Gelatin/BaTiO3>BaTiO3/Agar>BaTiO3/Gelatin-Chitosan>BaTiO3/Gelatin>BaTiO3. The conclusion suggests that the preparation of BaTiO3/Polymer composite particles, significantly improve the electric response performance of the BaTiO3particles. It is much helpful to application of the BaTiO3-based ER materials and is an effective approach to prepare excellent ER hydrous elastomers.

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CLC: > Industrial Technology > Electrotechnical > Electrical materials > General issues > Theory > Material properties
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