Whisker Carbon Nanotubes Modified Polyether Ether Ketone And Thermal Conductivity And Electromagnetic Shielding Properties

5G technology is regarded as a technology that can change the world.With its rapid development,electronic products are also rapidly advancing in the direction of smaller size and higher power.In addition to the improvement of efficiency,it also brings serious heat dissipation problems and electromagnetic problems.interference problem.However,China is currently at the forefront of the world's 5G technology development,and faces huge challenges brought by the construction of supporting facilities.And with the development of 5G technology,more application scenarios have been brought,and it is also a top priority to ensure the application of 5G equipment under various complex conditions.Traditional heat dissipation and electromagnetic shielding materials,such as aluminum and copper,are difficult to adapt to complex environments and have high density,which cannot achieve the goal of lightweight equipment.The polyetheretherketone material itself,as a material used in high-precision fields,such as aviation,aerospace and other fields,has excellent corrosion resistance,radiation resistance,impact resistance,easy processing and other properties,but it also has polymer Materials share the problems of poor electrical conductivity,thermal conductivity and electromagnetic shielding performance.How to solve the problems of polyetheretherketone resin and make it into a special engineering material with high thermal conductivity and electromagnetic shielding performance is the key issue of current research.First,we prepared whisker carbon nanotubes/PEEK composites and graphite/PEEK composites by dichloroacetic acid solution blending and mechanical blending,respectively,and prepared whiskers by solution blending.Carbon nanotube/graphite/PEEK composite ternary composite.By comparison,it can be found that the solution blending method can effectively improve the dispersion effect of the filler in the matrix,reduce the electrical conductivity percolation value of the material,and improve the electrical conductivity,thermal conductivity and electromagnetic shielding properties of the composite material.After the whisker carbon nanotubes were introduced into the graphite/PEEK system to form a ternary composite material,the performance of the composite material was significantly improved,and the horizontal thermal conductivity of 3wt%WhCNTs/30wt%Gr/PEEK reached 2.33 W/m·K,the conductivity reaches 23.41 S/m,and the electromagnetic wave shielding performance reaches 31.8 d B.Then,based on solution blending,we prepared MXene/whisker carbon nanotubes/PEEK composite films by solution casting method,which effectively reduced the molding temperature of PEEK composites.From the SEM images,it can be seen that a continuous MXene layer is attached to the surface of the PEEK film.In the performance test,since the MXene layers overlapped each other to form an effective electrical and thermal conduction network,and the addition of whisker carbon nanotubes further improved the construction of the thermal conduction network,the MXene/whisker carbon nanotube/PEEK composite film material also It exhibits excellent performance.At the highest content(9.1wt%MXene/20wt%WhCNTs),the horizontal thermal conductivity reaches 3.37 W/m·K,the electrical conductivity reaches 141.3 S/m,and the EMI SE reaches 45.8 d B.