Gelatin／BaTiO3核壳复合粒子的制备及电场响应性能研究

Preparation and Electro Response of Gelatin/BaTiO_3 Core-shell Composite Particles

以平均粒径为0．7～0．9μm的明胶（Gelatin）微球为基核，通过定向沉积自组装法成功制各了以Gelatin为核、BaTiO3为壳的Gelatin／BaTiO3核壳复合粒子。利用TEM、XRD、FT-IR、TG和光学接触角测量等技术对复合粒子的形貌、结构、组成及表面亲水性能进行了研究。结果表明，复合粒子为球形微粒，具有良好的表面亲水性和分散稳定性，BaTiO3壳层约占粒子总质量的18．8％，具有立方相晶相结构。将粒子分散到水凝胶弹性体中，测量在有／无电场作用下得到的弹性体的储能模量，借以考察复合粒子在弹性体中的电场响应性能，发现Gelatin／BaTiO3复合粒子的电场响应性能明显强于纯BaTiO3粒子。说明将BaTiO3包覆在聚合物上能显著提高BaTiO3粒子的电场响应性能。

The Gelatin/BaTiO3 core-shell composite particles were prepared by directional sedimentary self-assembly on the gelatin microspheres with an average particle size about 0.7-0.9 μm. Morphology, structure, composition, and surface hydrophile of the particle were characterized by TEM, XRD, FT-IR, TG, and optical contact angle measuring instrument. The results show that the composite particles are spherical with hydrophilic surface and good dispersion, of which cubic BaTiO3 shell accounts for about 18.8% of the total weight. After BaTiO3 and Gelatin/BaTiO3 particles being dispersed into gelatin hydrous elastomers cured with/without an electric field, the difference of storage modulus of the elastomers suggests that Gelatin/BaTiO3 composite particles have stronger electro response than pure BaTiO3 particles. These data demonstrate that coating polymer with BaTiO3 significantly can improve BaTiO3 particles electro response.