Study On Insulation And Mechanical Properties Of Epoxy Resin/Silicone Rubber Modified By Nanoparticles

The introduction of nanoparticles to modify materials to enhance the insulating and mechanical properties of composite materials is one of the commonly used modification methods.The modification effect of materials is closely related to the surface properties of nanoparticles.In this paper,we use KH550 silane coupling agent and plasma fluorination in coordination with KH550 to modify the surface of ZnO and SiO₂ particles,and prepare the composite sample of ZnO and SiO₂ particles modified epoxy resin and silicone rubber matrix.The effects of different surface modification methods on the insulation and mechanical properties of the modified composite were analyzed through insulation and mechanical properties testing.Three kinds of surface modified nano-zno and SiO₂ were characterized by X-ray electron spectroscopy,scanning electron microscopy and Fourier infrared spectroscopy.The results showed that the surface properties of nanoparticles were improved after modification.After plasma fluorination treatment,F element is successfully introduced into the surface of ZnO and SiO₂ particles,and the energy released during the treatment process reduces the particle size and improves the surface roughness of nanoparticles to a certain extent.The insulation test results of modified materials show that there are a variety of micro-interface effects between nanoparticles and matrix materials,and different surface treatment methods and introduced amounts of particles will form different effects,which will affect the insulation properties of materials.Among them,the volume resistivity,initial voltage and breakdown field strength of SiO₂/epoxy + silicone rubber with a concentration of 5wt%after fluorination are the largest.The relative dielectric constant and dielectric loss of 4wt%ZnO+SiO₂/epoxy+silicone rubber after fluoride are the lowest.The mechanical test results of the modified materials show that the introduction of nanoparticles also has a certain effect on the mechanical properties of the material matrix.The influence of different surface modification and dosage is different.Among them,ZnO particles without surface modification have the most obvious negative effect on the interface properties between the matrix materials.After surface modification,the negative effect of nanoparticles can be alleviated,and the positive effect can be played at low dosage.The fluorinated nanoparticles significantly improved the macroscopic interfacial properties of the materials.In summary,compared with the nanoparticles without surface modification,the surface modified nanoparticles have a more positive effect on the macro and micro interfaces of the materials,which can better improve the insulation and mechanical properties of the materials.Compared with the single modification,the fluorination co-treatment of nanoparticles has better modification effect on the material.