Research On Electromechanical Properties And Application Of Silicone Rubber Dielectric Elatomer

Silicone rubber is a typical dielectric elastomer(DE),which has good elasticity,flexibility and wide temperature tolerance.It has electric deformation under the action of electric field,and the response time is fast.When the electric field is removed,it can be restored to its initial state.Because of its low electric shape variable,dielectric filler is usually added to the silicone rubber to prepare composite dielectric materials to improve the mechanical and electrical coupling efficiency.Based on the working principle of the dielectric deformation of silicone rubber,it is often used to make flexible drives,sensors and other devices,which has a broad prospect in biomedical,sensing detection,transportation and other fields.Based on the principle of electromechanical coupling of dielectric elastomer,the experiment of different proportion of silicone rubber is carried out,the ratio is determined,and the numerical model is established to study the strain characteristics of silicone rubber.The silicon rubber was modified by adding dielectric filler to prepare the silicone rubber dielectric composite.The mechanical and electrical properties of the composite were studied by experiments.The swing driving unit of the silicone rubber was designed and manufactured.The performance test was carried out and the optimized structural dimension parameters were obtained.The main work and research results are as follows:(1)the elastic modulus of silicone rubber a/b component is lower when the component is 1:0.8,which is suitable for this project.The parameters of Mooney Rivlin model are fitted by using the stressstrain curve,and the constitutive equation of the dielectric materials of silicone rubber is derived.Based on the thermodynamic system and constitutive equation,the mechanical and electrical stability of silicone rubber is derived.The relationship between tensile and stress and electric field is found by numerical simulation.The failure modes of the dielectric elastomers of silicone rubber are studied and the corresponding mechanical models are given,and the allowable area of the dielectric elastomers is drawn.(2)The results show that pre stretching can enhance the mechanical and electrical coupling efficiency of the dielectric film.The mechanical and electrical coupling performance of the film is the best when ? = 3 is pre stretched,with the maximum electric deformation area of 9.3%,and the critical voltage value of 3.9k V/ mm.(3)The core shell structure of Si O2 PDDA go was prepared by the method of electrostatic self-assembly,and the dispersion of graphene was improved.The mechanical and electrical coupling properties of the composite were tested.The results show that the more the dielectric filler content of the silicone rubber matrix is,the better the electrical deformation performance and the lower the driving voltage.The driving voltage is the lowest at 30 wt% mass fraction,which is 2.99 k V/mm,which is 23%lower than that of pure silicone rubber,and the maximum electric deformation area is10.24%,and the increase is 10%.(4)The swing driving unit is designed and manufactured by using the silicone rubber dielectric composite packing.After the performance test,the driving unit with the bottom × high dimension of 40 mm × 45 mm is isosceles triangle,and the swing amplitude of the driving unit with the width of 5mm is 13 degrees at 3 k V which is a better swing driving unit.