2 research outputs found
Fabrication of Flexible FCI/PDMS Electromagnetic Shielding Composites Based on Pulsed Magnetic Field-Induced Alignment
No full textConductive polymer composites have been utilized in the
field of
electromagnetic interference (EMI) shielding, albeit requiring a high
concentration of conductive fillers to achieve desirable EMI performance.
To address this issue and enable the creation of superior EMI shielding
composites with reduced filler loadings, this study employed a pulsed
magnetic field featuring an amplitude of 0.7 T, a pulse width of 10
μs, and a frequency of 100 Hz to align flaky carbonyl iron (FCI)
in poly(dimethylsiloxane) (PDMS). This method resulted in an improved
EMI shielding performance of the composites. The outcomes revealed
that the pulsed magnetic field effectively controlled the orientation
of the FCI, forming a conductive network structure, with the average
orientation angle of the FCI reaching 69.3°. The aligned composites
exhibited a significant improvement in EMI shielding effectiveness,
with the enhancement effect reaching 37.53% and the EMI shielding
effectiveness reaching 24.87 dB. Moreover, the flexible tensile properties
of the aligned composites were superior to those of the unaligned
composites, particularly the elongation at break, which reached 197.46%.
The concordance between the theoretical analysis and experimental
results affirms the efficacy of the microsecond pulsed magnetic field
in enhancing the EMI shielding performance of composite materials.
Ultimately, the high-performance, flexible electromagnetic shielding
composite materials prepared in this study demonstrate potential for
use in advanced electronic equipment
