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Highly Stretchable Polymer Composite with Strain-Enhanced Electromagnetic Interference Shielding Effectiveness.
Bin Yao1,2, Wei Hong3, Tianwu Chen4
1State Key Laboratory for Mechanical Behavior of Materials, School of Material Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Advanced Materials (Deerfield Beach, Fla.)
|February 22, 2020
Summary
Researchers developed a highly stretchable polymer composite with a 3D liquid-metal network that enhances electromagnetic interference shielding effectiveness (SE) when stretched, outperforming traditional materials for soft electronics.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Polymer composites with conductive fillers are explored for flexible electromagnetic interference (EMI) shielding.
- Existing stretchable EMI shielding materials often show reduced effectiveness upon stretching.
Purpose of the Study:
- To develop a highly stretchable polymer composite with enhanced EMI shielding effectiveness.
- To investigate the performance of a 3D liquid-metal network in stretchable conductive materials.
Main Methods:
- Fabrication of a polymer composite embedded with a 3D liquid-metal (LM) network.
- Characterization of mechanical properties, including stretchability and toughness.
- Evaluation of electromagnetic interference shielding effectiveness (SE) across a broad frequency range (2.65-40 GHz).
- Measurement of electrical conductivity under large mechanical deformations.
Main Results:
- The 3D LM composite demonstrated substantial increases in EMI SE when stretched.
- The material achieved EMI SE comparable to metallic plates over a wide frequency range.
- Exceptional electrical conductivities were maintained under large mechanical deformations.
- The composite exhibited skin-like elastic compliance and toughness.
Conclusions:
- The developed 3D LM polymer composite offers a promising solution for high-performance stretchable EMI shielding.
- This material addresses the limitations of current stretchable conductors, particularly the deterioration of shielding effectiveness with stretching.
- The findings pave the way for advanced soft and human-friendly electronic applications requiring robust EMI shielding.
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