Dual-material direct ink writing preparation and electromagnetic shielding properties of bridged solid-liquid composites
Bridged solid-liquid composites were prepared by a dual-material direct ink writing process using high-viscosity silicone rubber as solid-phase ink and carbon black/low-viscosity silicone rubber as liquid-phase ink,and characterized by ultra-depth of field digital microscope and three-dimensional X ray imaging platform.The tensile properties,electrical conductivity and total electromagnetic shielding effectiveness of the bridged solid-liquid composites with different liquid-phase bridging spans(0.4,0.8,1.2 mm)were analyzed,and the stability of the total electromagnetic shielding effectiveness under strain and cyclic loading was further evaluated.The results showed that the alternate arrangement of solid and liquid phases into a regular three-dimensional lattice structure led to the synergistic improvement in mechanical properties and electromagnetic shielding properties of the bridged solid-liquid composites.The elongation at break,electrical conductivity and total electromagnetic shielding effectiveness of bridged solid-liquid composites increased with the increment of liquid-phase bridging span,while the one with liquid-phase bridging span of 1.2 mm(SL-1.2)exhibited the highest elongation at break(233%),the largest electrical conductivity(0.45 S/m),and the strongest total electromagnetic shielding effectiveness(27.41 dB).Under 75%strain,the total electromagnetic shielding effectiveness of SL-1.2 increased by 0.49%compared with that under 0 strain,and its total electromagnetic shielding effectiveness remained stable under cyclic loading(1000 turns).
conductive compositesdual-material direct ink writingbridged solid-liquid structure3D printingelectromagnetic shieldingfunctional materials
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维普
