Preparation and Properties of Self-Healing Polydimethylsiloxane/Single-Walled Carbon Nanotubes Electromagnetic Shielding Materials
The traditional metal shielding materials primarily rdflect electromagnetic wave,which frequently give rise to secondary radiation,possess high density,high hardness,and are susceptible to corrosion.Consequently,research efforts are being directed towards the development of new flexible polymer electromagnetic shielding materials that primarily absorb electromagnetic waves.In this paper,ultrasonic dispersion assisted liquid deposition technology was used to coat single-walled carbon nanotubes onto the surface of dynamically modified polydimethylsiloxane powder,followed by hot pressing to form a composite material.The analysis by scanning electron microscopy shows that single-walled carbon nanotubes form a conductive isolated network structure within the polymer matrix.The electromagnetic shielding performance was tested by a vector network analyzer.When the load content of single-walled carbon nanotubes is 1％,the electromagnetic shielding performance exceeds 20 dB at X-band;when the content increases to 5％,the shielding efficiency reaches 70 dB,and the absorption loss is as high as 93％.Moreover,the combination of the dynamic properties of the polymer matrix within the composite material with the photoelectric properties of carbon nanotubes allows for self-healing under various stimuli such as heat,electricity,and near-infrared light.
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