Preparation And Properties Of Dielectric Elastomer Filled With Copper Calcium Titanate Particles

The rapid development of nursing robots provides an opportunity for the development of artificial muscles, which makes the development of electroactive dielectric elastomers a hot spot.organic-inorganic composite is one of the important ways to prepare dielectric elastomer. To improve the electrical response properties of dielectric elastomers, inorganic fillers are often required to have higher dielectric constant, lower dielectric loss, etc. The matrix polymer phase has lower modulus.Around the development of novel dielectric elastomers, this paper chooses CCTO with high dielectric constantas an inorganic filler phase. Dielectric elastomer are obtained by element doping, controling particle size, optimizing its own properties and combining with silicone rubber. It has been detailed researched that elements doping, synthetic process conditions and composite process for the influence of the structure and performance of dielectric elastomers,and established a relationship between structure and driving deformation performance of dielectric elastomers.The structure and properties of dielectric elastomers are studied detailedly by elemental doping, synthesis process conditions and composite technology. The relationship between the structure of the dielectric elastomer and driving deformation are established. The main work of this paper is as follows: 1) oxalic acid as precipitant was used to prepare precursors by coprecipitation method, and copper calcium titanate powder was obtained by heat treatment.The influence of the dielectric properties of magnesium doping CaCu3Ti4O12 was studied. 2)Dielectric elastomers were prepared by using CaCu3Ti4O12, Mg doping CaCu3Ti4O12 as filler and silicone rubber as matrix. The effects of different doping content of magnesium element and different filling amount on the electrical deformation and structure of the composites were investigated. 3) Capacitance signal and microstructure were studied when different filling,different sizes of copper calcium titanate/silicon rubber dielectric elastomer were under tension conditions. And the influence of microstructure on the composite was established.The main conclusions are as follows:1.The pure phase high dielectric constant copper calcium titanate powders with average particle size of 500nm and spherical shape were successfully prepared by coprecipitation method.With the increase of magnesium doping,the agglomeration of MgxCa1-xCu3Ti4O12 particles is deteriorated. When the doping content is 0.2, the dielectric constant of Mg0.2Ca0.8Cu3Ti4O12 is 2 times higher than that of CCTO.2.Copper calcium titanate/silicon rubber dielectric elastomer and magnesium doped copper calcium titanate/silicon rubber dielectric elastomer were perpared by solvent method. The relationship between the electric deformation and the structure of the composites was studied,including the different doping content of magnesium and the different filling. When the filling amount is 2wt%, the final dielectric elastomer has the best driving deformation, which can reach 15.86%. At this time, the dielectric constant of the composite and Young's modulus Modulus best fit.3. With the decrease of CCTO particle size, the microstructural modulus of the soft segment of the dielectric elastomer increases. And the macro-modulus also increases, the driving deformation is affected. In the tensile conditions,, the capacitance of the composite increases with increasing elongation. At the same time, as the filled CCTO particle size decreases, the capacitance also exhibits a similar trend.