| Dielectric silicone elastomer enjoys the most common research in the dielectric elastomer field,mainly because they have some advantages of high dielectric constant,low modulus,fast response speed,high elastic energy density and good process ability,Many researchers have made a lot of research on it,at present,the problem is that the dielectric elastomer undergoes significant deformation under a large driving voltage,these shortcomings makes it difficult to get used in the above fields quickly.The starting point of this paper is that the dielectric particles were doped into the silicone rubber matrix,with inducing of the external electric field,the dielectric particles are arranged in the silicone rubber matrix orderly,and then the properties of dielectric elastomer composites were researched by different arrangement of the electric particles,the purpose of this paper is to improve the dielectric properties of dielectric elastomer composites,while its modulus remained at a relatively low value,so that the dielectric elastomer composites has great electro deformation under low applied voltage.The main contents are as follows:(1)The silicone rubber matrix was filled with different amounts of PS/PDA/Ag/PDA dielectric particles,different types of dielectric elastomer composites were prepared.The effects of different dielectric particle amounts on the properties of dielectric elastomer composites were investigated.The results show that with the increasing of dielectric particles,the modulus of dielectric elastomer composites is also increasing,the modulus of the pure silicone rubber is 0.38MPa,and the modulus of the dielectric elastomer composite material filled with 25 phr dielectric particles is 1.8MPa.At the same time as the dielectric particles continue to increase,the dielectric constant of the material also rises,at a frequency of 100Hz,the dielectric constant of pure silicone rubber is 3.9,the dielectric constant of the dielectric elastomer composite material filled with 25 phr dielectric particles is 7.8.In the electro deformation,at 4kV/mm,the electrical deformation of the pure silicone rubber is 2.1%,and the electrical deformation of the dielectric elastomer composite material filled with 25 phr dielectric particles is is 7.9%.(2)In the preparation process of dielectric elastomer composites,the internal dielectric particles of the dielectric elastomer composites are ordered by different directions of the external electric field.The effects of the applied electric field in the different directions on the properties of the dielectric elastomer composites were tested.In the process of preparing the dielectric elastomer composite material,without electric field,the dielectric particles fail to form an ordered array of particles in the silicone rubber matrix.When the horizontal electric field is applied in the process,the dielectric particles are filled at 10 phr or 15 phr,the number of the dielectric particles is small,so it can not form obvious ordered particle chains in the silicone rubber matrix.When the amount of dielectric particles increased to 20phr or 25phr,due to the increasing in the number of dielectric particles,in the horizontal direction of the dielectric elastomer composite,the particles are arranged in an ordered arrangement,the ordered degree of internal particle arrangement of the dielectric elastomer composites prepared by 25 phr of the dielectric particles are better than the ordered degree of internal particle arrangement of the dielectric elastomer composites prepared by 20 phr of the dielectric particles.The dielectric elastomer composites prepared by applying a vertically electric field are similar to the dielectric elastomer composites prepared by applying a horizontal electric field,the internal particles are ordered in a direction perpendicular to the surface of the material.(3)The influence of different electric field strength on the properties of dielectric elastomer composites was tested.In the process of preparing the dielectric elastomer,different types of dielectric elastomer composites were prepared by applying different applied electric field strength of 150 V/mm and 200 V/mm.The results show that the applied electric field of 200 V/mm can make the dielectric particles in the dielectric elastomer composite more ordered comparing with the 150 V/mm,and the modulus is lower,the dielectric constant and the electrical deformation are higher,when the dielectric particles were filled at 25 phr,the modulus of the dielectric elastomer composite which was prepared by applying a horizontal applied electric field of 150 V/mm was 1.21 MPa,the dielectric constant at 100 Hz was 8.8,and the electrical deformation at an electric field strength of 4 kV/mm is 9.5%.The modulus of the dielectric elastomer composite which was prepared by applying a horizontal applied electric field of 200 V/mm was 0.86 MPa,the dielectric constant at 100 Hz is 10.2,and the electrical deformation at an electric field strength of 4 kV/mm is 10.7%.The dielectric constant of the dielectric elastomer composites which was prepared by applying a vertical applied electric field of 150 V/mm is 2.02 MPa,the dielectric constant at 100 Hz is 7.6,and the electrical deformation at an electric field strength of 4 kV/mm is 7.1%.;The modulus of the dielectric elastomer composites prepared at a horizontal applied electric field of 200 V/mm is 1.14 MPa.the dielectric constant at 100 Hz is 7.8,the electrical distortion at an electric field strength of 4 kV/mm is 7.5%... |
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